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16 Channels of Programmable Output Span Using the AD5360 16-Bit Voltage Output DAC (CN0131)
NEW
Circuit Function and Benefits
This circuit is a multichannel DAC configuration with different output spans on groups of channels. It utilizes the AD5360 to provide 16 DAC channels with 16 bits of resolution. The AD5360 is configured to have eight channels with an output span of ±10 V and eight channels with an output span of ±5 V.
| Applications: | Instrumentation |
High Speed Instrumentation Amplifier Using the AD8271 Difference Amplifier and the ADA4627-1 JFET Input Op Amp (CN0122)
NEW
Circuit Function and Benefits
A traditional method for building an instrumentation amplifier is to use three op amps and seven resistors as shown in Figure 1. This approach requires four precision matched resistors for a good common-mode rejection ratio (CMRR). Errors in matching will produce errors at the final output. An imbalance of one or two picofarads on certain nodes will drastically degrade the high frequency CMRR, a fact often overlooked.
This circuit uses a monolithic difference amplifier with laser trimmed thin film resistors for the output amplifier, thereby providing good dc and ac accuracy with fewer components than the traditional approach.
| Circuit Types: | Interface |
| Optimized For: | High Speed; Low Noise and Distortion |
| Applications: | I&I; Instrumentation; Process Control |
Integrated Device Power Supply (DPS) for ATE with Output Voltage Range 0 V to 25 V (CN0130)
NEW
Circuit Function and Benefits
In the past, DPS (device power supply) solutions were designed from discrete amplifiers, switches, DACs, resistors, etc. New silicon processes and shrinking silicon now allow highly integrated solutions, but it’s rarely possible to put everything onto one single piece of silicon. Even with its high level of integration, the AD5560 DPS requires a few well chosen external components to provide a complete system solution. The goal of this circuit note is to describe in more detail what is required and why it was selected and to provide a more complete device power supply solution.
| Optimized For: | High Precision |
| Applications: | I&I |
Synchronizing Multiple AD9910 1 GSPS Direct Digital Synthesizers (CN0121)
NEW
Circuit Function and Benefits
Synchronization of multiple DDS devices allows precise digital tuning control of the phase and amplitude across multiple frequency carriers. This type of control is useful in radar applications and quadrature (I/Q) upconversion for side-band suppression.
The circuit in Figure 1 demonstrates how to synchronize four AD9910 1 GSPS, DDS chips using the AD9520 clock generator and the ADCLK846 clock fanout buffer. The result is precise phase alignment between the clock and output signals of four AD9910 devices.
| Circuit Types: | Clocking; DAC Circuit; Filtering; Switching |
| Optimized For: | High Precision; High Resolution; High Speed |
| Applications: | Communications; Medical |
Extending the Capacitive Input Range of the AD7745/AD7746 Capacitance-to-Digital Converter (CN0129)
NEW
Circuit Function and Benefits
This circuit provides a method to extend the capacitive input range of the AD7745/AD7746. How to use the on-chip CapDAC sufficiently in order to minimize the range extension factor and, therefore, optimize the circuit to achieve the best possible performance is also explained. The AD7745 has one capacitance input channel, while the AD7746 has two channels. Each channel can be configured as single-ended or differential.
| Circuit Types: | ADC Circuit/Driver |
| Optimized For: | High Performance; High Resolution |
| Applications: | Instrumentation; Process Control |
Weigh Scale Design Using the AD7781 20-Bit Sigma-Delta ADC with Internal PGA (CN0108)
NEW
Circuit Function and Benefits
This circuit is a weigh scale system that uses the AD7781. The AD7781 is a pin programmable, low power, low drift 20-bit Σ-Δ converter that includes a PGA and uses an internal clock. Therefore, the device simplifies the weigh scale design since most of the system building blocks are included on the chip. The device consumes only 330 μA typically and is, therefore, suitable for any low power or battery application. The AD7781 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7781 when not converting, thus increasing the battery life.
| Optimized For: | High Resolution; Low Noise and Distortion |
| Applications: | I&I; Instrumentation |
Weigh Scale Design Using the AD7780 24-Bit Sigma-Delta ADC with Internal PGA (CN0107)
NEW
Circuit Function and Benefits
This circuit is a weigh scale system that uses the AD7780. The AD7780 is a pin programmable, low power, low drift 24-bit Σ-Δ ADC that includes a PGA and uses an internal clock. Therefore, the device simplifies the weigh scale design since most of the system building blocks are included on the chip. The device consumes only 330 μA typically and is, therefore, suitable for any low power or battery application. The AD7780 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7780 when not converting, thus increasing the battery life.
| Optimized For: | High Resolution; Low Noise and Distortion |
| Applications: | I&I; Instrumentation |
Precision Weigh Scale Design Using the AD7192 24-Bit Sigma-Delta ADC with Internal PGA (CN0119)
NEW
Circuit Function and Benefits
This circuit is a weigh scale system that uses the AD7192. The AD7192 is an ultralow noise, low drift, 24-bit Σ-Δ converter that includes a PGA. Therefore, the device simplifies the weigh scale design because most of the system building blocks are included on chip. Since the part operates with an output data rate from 4.7 Hz to 4.8 kHz and maintains good performance over the complete output data rate range, this allows the part to be used in weigh scale systems that operate at low speeds along with higher speed weigh scale systems, such as hopper scales.
| Optimized For: | High Precision |
| Applications: | Instrumentation |
Using the ADL5562 Differential Amplifier to Drive Wide Bandwidth ADCs for High IF AC-Coupled Applications (CN0110)
NEW
Circuit Function and Benefits
This circuit provides high performance, high frequency sampling using the ADL5562, a high performance, differential, low noise, ultralow distortion, high output linearity, pin-strappable gain amplifier, and high speed ADCs. The ADL5562 is optimized for driving high frequency IF sampling ADCs. When coupled with a high speed ADC like the AD9445, AD9246, or AD6655, it provides exceptional SFDR performance beyond 100 MSPS at its maximum gain.
| Circuit Types: | ADC Circuit/Driver; Filtering; Interface; RF/IF Driver |
| Optimized For: | Low Noise and Distortion |
| Applications: | Communications |
High Speed, Precision, Differential AC-Coupled Drive Circuit for 16-Bit, 6 MSPS AD7625 PulSAR ADC (CN0080)
NEW
Circuit Function and Benefits
This circuit provides a method to drive an ac-coupled differential input signal to the AD7625, 16-bit, 6 MSPS PulSAR® differential ADC. This circuit has been designed to ensure maximum performance of the AD7625 by providing adequate settling time and low distortion. It uses a buffered VCM output voltage from the AD7625 to set each amplifier's common-mode level.
| Circuit Types: | ADC Circuit/Driver; Power; Voltage Reference |
| Optimized For: | High Precision; High Resolution; Low Noise and Distortion |
| Applications: | Instrumentation; Medical |
Programmable Bidirectional Current Source Using the AD5292 Digital Potentiometer and the ADA4091-4 Op Amp (CN0117)
NEW
Circuit Function and Benefits
The circuit in Figure 1 provides a programmable bidirectional Howland current source using the AD5292 digital potentiometer, a member of the digiPOT+ family, in conjunction with the quad ADA4091-4 op amp and the ADR512 voltage reference.This circuit offers 10-bit resolution over an output current range of ±18.4 mA. The AD5292 is programmable over an SPI-compatible serial interface.
| Circuit Types: | DAC Circuit |
| Optimized For: | Low Noise and Distortion |
| Applications: | Communications; Instrumentation |
Programmable High Voltage Source with Boosted Output Current Using the AD5292 Digital Potentiometer, OP184 Op Amp, and MOSFETs (CN0115)
NEW
Circuit Function and Benefits
The circuit shown in Figure 1 provides a low cost, program-mable, high voltage source with boosted output current using the AD5292 digital potentiometer, a member of the digiPOT+ family, in conjunction with the OP184 operational amplifier. The BSS138 PMOS transistor and Si2307CDS NMOS transistor provide current drive capability up to 2.5 A.
| Circuit Types: | DAC Circuit |
| Applications: | Communications; I&I; Process Control |
Automated Calibration Technique That Reduces the AD5360 16-Channel, 16-Bit DAC Offset Voltage to Less Than 1 mV (CN0123)
NEW
Circuit Function and Benefits
The circuit described in this document and shown in Figure 1 provides a method of calibrating that removes an unknown offset error. When using high precision, high resolution DACs in industrial process control and instrumentation applications, low offset is often a critical specification. The circuit uses built-in features of the AD5360 in conjunction with an external comparator and an operational amplifier to determine if the DAC output voltages are above or below a ground reference signal. With the amount of offset known, the user can adjust the codes sent to the DAC to null out the offset.
| Circuit Types: | DAC Circuit; Multichannel |
| Optimized For: | High Precision; High Resolution |
| Applications: | I&I; Instrumentation; Process Control |
30 V Low Cost DAC Using the AD5292 Digital Potentiometer (CN0111)
Circuit Function and Benefits
This circuit shown in Figure 1 provides a low cost, high voltage unipolar DAC using the AD5292 digital potentiometer, a member of the digiPOT+ family, in conjunction with the dual ADA4091-2 op amp and ADR512 voltage reference. This circuit offers 10-bit resolution over an output voltage range of 0 V to 30 V and is capable of delivering up to ±20 mA output current. The AD5292 is programmable over an SPI-compatible serial interface.
| Applications: | Process Control |
Precision Weigh Scale Design Using the AD7190 24-Bit Sigma-Delta ADC with Internal PGA (CN0102)
Circuit Function and Benefits
This circuit is a weigh scale system, which uses the AD7190, an ultralow noise, low drift, 24-bit Σ-Δ ADC with internal PGA. The AD7190 simplifies the weigh scale design because most of the system building blocks are included on the chip.
The AD7190 maintains good performance over the complete output data rate range, from 4.7 Hz to 4.8 kHz, which allows it to be used in weigh scale systems that operate at low speeds along with higher speed weigh scale systems, such as hopper scales.
| Circuit Types: | Interface |
| Optimized For: | High Performance; High Resolution; Low Noise and Distortion |
| Applications: | I&I; Instrumentation |
High Voltage, High Precision Current Sensing with Output Level Shifting Using the AD8210 Current Sense Amplifier and the AD8274 Difference Amplifier (CN0116)
Circuit Function and Benefits
Current monitoring is a critical function in a variety of applications such as power management, solenoid control, and motor control. Accurate current sensing and diagnostic protection from shorts to GND are achieved by monitoring current on the high side of the load.
| Circuit Types: | Interface |
| Optimized For: | High Precision; High Resolution |
| Applications: | Automotive; Communications; Motion Control; Process Control |
Low Cost, High Voltage, Programmable Gain Instrumentation Amplifier Using the AD5292 Digital Potentiometer and the AD8221 In-Amp (CN0114)
| Optimized For: | Low Noise and Distortion |
| Applications: | Instrumentation; Medical; Metering; Process Control |
Variable Gain Inverting Amplifier Using the AD5292 Digital Potentiometer and the OP184 Op Amp (CN0113)
| Optimized For: | Low Noise and Distortion |
| Applications: | Instrumentation; Process Control |
Variable Gain Noninverting Amplifier Using the AD5292 Digital Potentiometer and the OP184 Op Amp (CN0112)
Circuit Function and Benefits
This circuit provides a low cost, high voltage, variable gain noninverting amplifier using the AD5292 digital potentiometer, a member of the DigiPOT+ family, in conjunction with the OP184 operational amplifier.
The circuit offers 1024 different gains, controllable through an SPI-compatible serial digital interface. The ±1% resistor tolerance performance of the AD5292 provides low gain error over the full resistor range, as shown in Figure 2.
The circuit supports rail-to-rail inputs and outputs for both single-supply operation at +30 V and dual-supply operation at ±15 V, and is capable of delivering up to ±6.5 mA output current.
In addition, the AD5292 has an internal 20-times programmable memory that allows a customized gain setting at power-up.
The circuit provides accuracy, low noise, and low THD and is well suited for signal instrumentation conditioning.
| Circuit Types: | DAC Circuit |
| Optimized For: | Low Noise and Distortion |
| Applications: | Instrumentation; Process Control |
High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/AD5541 Voltage Output DAC, ADR421 Reference, and AD8628 Auto-Zero Op Amp (CN0079)
Circuit Function and Benefits
This circuit provides precision data conversion using the AD5542 voltage output DAC together with the ADR421BRZ voltage reference and the AD8628 auto-zero op amp as the reference buffer. The AD8628 reference buffer provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., circuit topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required, and the digital switching noise associated with most chopper-stabilized amplifiers is greatly reduced, thereby making this the optimum choice for reference buffering.
| Optimized For: | High Precision; High Resolution; Low Noise and Distortion; Temperature Stability |
| Applications: | Instrumentation; Medical; Process Control |
USB Based Temperature Monitor Using the ADuC7061 Precision Analog Microcontroller and an External RTD (CN0075)
Circuit Function and Benefits
This circuit shows how the ADuC7061 precision analog microcontroller can be used in an accurate RTD temperature monitoring application. The ADuC7061 integrates dual 24-bit Σ-Δ ADCs, dual programmable current sources, a 14-bit DAC, and a 1.2 V internal reference as well as an ARM7 core, 32 kB flash, 4 kB SRAM, and various digital peripherals such as UART, timers, SPI, and I2C interfaces. The ADuC7061 is connected to a 100 Ω RTD.
| Circuit Types: | ADC Circuit/Driver; Filtering; Interface; Power |
| Optimized For: | High Precision; High Resolution; Low Noise and Distortion; Temperature Stability |
| Applications: | Building Controls; Instrumentation; Metering; Process Control |
Simplified 16-Bit Voltage Output and 4 mA-to-20 mA Output Solution Using the AD5422 (CN0077)
Circuit Function and Benefits
This circuit provides unipolar/bipolar voltage and 4 mA-to- 20 mA outputs using the AD5422, a single channel, 16-bit, serial input, unipolar/bipolar voltage, 4 mA-to-20 mA current source DAC. This circuit utilizes only the AD5422 product. The only external components needed are decoupling capacitors on the supply pins and reference input and a pull-up resistor for the open-drain FAULT output, which alerts to a loss of compliance voltage on the current output or an overtemperature of the AD5422. This solution offers a level of integration that leads to savings in both cost and board space. This circuit is well suited for both programmable logic controllers (PLCs) and distributed control systems (DCSes) in industrial control applications.
| Optimized For: | High Precision; High Resolution |
| Applications: | Instrumentation; Process Control |
Products Used in This Circuit:
AD5422
AD5422
Parametric Measurement Unit and Supporting Components for ATE Applications Using the AD5522 PMU and the AD7685 16-Bit ADC (CN0104)
Circuit Function and Benefits
This circuit is a quad parametric measurement unit (PMU) with supporting components to service a minimum of four device-under-test (DUT) channels. Typically, PMU channels are shared among a number of DUT channels. Although the AD5522 is very integrated and delivers four full PMU solutions, an external reference and an ADC are required as a minimum to complete this portion of the ATE signal chain. Typically, this reference and the ADC can be shared among multiple PMU packages. For further flexibility, additional external switches can be used to extend the capabilities of the PMU by extending the range of DUT capacitances that the AD5522 can drive.
| Circuit Types: | ADC Circuit/Driver; Switching; Voltage Reference |
| Optimized For: | High Precision |
Low Jitter Sampling Clock Generator for High Performance ADCs Using the AD9958/AD9858 500 MSPS/1GSPS DDS and AD9515 Clock Distribution IC (CN0109)
Circuit Function and Benefits
This circuit uses a direct digital synthesizer (DDS) with sub-Hertz tuning resolution as a low jitter sampling clock source for high performance ADCs. The AD9515 clock distribution IC provides PECL logic levels to the ADC. However, the AD9515 internal divider feature also allows the DDS to run at a higher frequency into the AD9515 front end, effectively increasing input slew rate. A higher slew rate into the AD9515 input squaring circuit can help reduce broadband jitter in the clock path.
| Circuit Types: | ADC Circuit/Driver; Clocking |
| Optimized For: | High Precision; High Resolution; Low Noise and Distortion |
| Applications: | Communications |
Simplified 16-Bit, 4 mA-to-20 mA Output Solution Using the AD5420 (CN0098)
Circuit Function and Benefits
This circuit provides a 4 mA-to-20 mA output using the AD5420, a single channel, 16-bit, serial input, 4 mA-to-20 mA current source DAC. This circuit utilizes only the AD5420 product. The only external components needed are decoupling capacitors on the supply pins and reference input and a pull-up resistor for the open-drain FAULT output, which alerts to a loss of compliance voltage on the output or an over-temperature of the AD5420 device. This offers a level of integration that leads to savings in both cost and board space. This circuit is well suited for both programmable logic controllers (PLCs) and distributed control systems (DCSes) in industrial control applications.
| Optimized For: | High Precision; High Resolution |
| Applications: | Instrumentation |
Products Used in This Circuit:
AD5420
AD5420
Software Configurable 12-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using the AD5722R DAC (CN0091)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5722R, a dual, 12-bit, serial input, unipolar/bipolar voltage output DAC. The only external components needed for this 12-bit DAC are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Optimized For: | Temperature Stability |
| Applications: | Instrumentation; Process Control |
Products Used in This Circuit:
AD5722R
AD5722R
High Precision, Low Cost Current Sources Using the AD8276 Difference Amplifier and the AD8603 Op Amp (CN0099)
Circuit Function and Benefits
Current sources are widely used in industrial, communication, and other equipment for sensor excitation and machine-to-machine communication, etc. For example, the 4 mA-to-20 mA loop is widely used in process control equipment.
| Circuit Types: | Interface |
| Optimized For: | Temperature Stability |
| Applications: | Building Controls; Communications; Instrumentation; Metering; Process Control |
Simplified 12-Bit Voltage and 4 mA-to-20 mA Output Solution Using the AD5412 (CN0097)
Circuit Function and Benefits
This circuit provides unipolar/bipolar voltage and 4 mA-to- 20 mA outputs using the AD5412, a single channel, 12-bit, serial input, unipolar/bipolar voltage and 4 mA-to-20 mA current source DAC. This circuit utilizes only the AD5412 product. The only external components needed are decoupling capacitors on the supply pins and reference input and a pull-up resistor for the open-drain FAULT output, which alerts to a loss of compliance voltage on the current output or an overtemperature of the AD5412 device. This solution offers a level of integration that leads to savings in both cost and board space. This circuit is well suited for both programmable logic controllers (PLCs) and distributed control systems (DCSes) in industrial control applications.
| Applications: | Instrumentation |
Products Used in This Circuit:
AD5412
AD5412
Reconstruction Video Filter Using the ADA4430-1 Amplifier After the ADV7393 Video Encoder (CN0101)
Circuit Function and Benefits
This circuit illustrates a digital-to-analog video converter paired with a low cost, low power, fully integrated reconstruction video filter. Although many video encoders (video DACs) such as the ADV7393 can drive a video load directly, it is often very beneficial to use a video driver at the output of a video encoder for power savings, line driving, and additional circuit protection. The video driver is typically configured as an active filter, also known as a reconstruction or anti-imaging filter. The purpose of the reconstruction filter is twofold: it blocks the higher frequency components (above the Nyquist frequency) that were introduced into the video signal as part of the digitization process and provides gain to drive the external 75 Ω cable to the video display. For ac-coupled output applications, the ADA4430-1 has an integrated SAG correction network. Signal amplitude gain (SAG) correction is used to provide low frequency compensation for the high-pass filter formed by the 150 Ω video load of a back-terminated cable and the output coupling capacitor. SAG correction reduces the size of the traditionally large ac coupling capacitor (330 μF), replacing it with much smaller 47 μF and 22 μF capacitors.
| Circuit Types: | Filtering |
| Optimized For: | High Resolution; High Speed |
| Applications: | Audio / Video; Automotive |
Precise Control of I/Q Modulator Output Power Using the ADL5386 Quadrature Modulator and the AD5621 12-Bit DAC (CN0070)
Circuit Function and Benefits
This circuit provides upconversion of I/Q modulated data and automatic power control of the RF/IF carrier level. The output power is set by a 12-bit DAC and can be precisely set over a linear-in-dB range of up to 30 dB. Stability over temperature is typically ±0.2 dB from −40°C to +85°C. Figure 1 shows operation at an output frequency of 350 MHz; however, the circuit will operate from 50 MHz to 2.2. GHz.
| Circuit Types: | RF/IF Driver |
| Optimized For: | High Performance; High Precision; High Speed; Temperature Stability |
| Applications: | Communications |
Interfacing the High Frequency AD8331 VGA to the AD9215 10-Bit, 65 MSPS/80 MSPS/105 MSPS ADC (CN0096)
Circuit Function and Benefits
Variable gain amplifiers (VGAs) serve a critical function when an analog signal with wide dynamic range is converted to digital format and the ADC resolution is insufficient to capture all useful information. For example, a 10-bit converter with a 2 V p-p input range has an LSB weight of 2 ÷ 1024, or just under 2 mV. The VGA amplifies input signals with amplitudes less than the minimum resolution and attenuates large signals that would otherwise saturate the ADC. Examples of such applications are ultrasound receivers where the signal strength ranges from microvolts to several volts, and the intermediate frequency (IF) amplifier used in virtually all receivers. For dc or low frequency analog signals, Σ-Δ ADCs with resolutions up to 24 bits are economical and plentiful, but typically limited in sampling frequency to a few hundred kilohertz. State-of-the-art, available ADC resolution decreases as sampling frequency increases. This makes accurate digitization of high frequency, low amplitude signals extremely difficult using standard ADCs. Variable gain amplifiers are a convenient solution to this problem, and Figure 1 shows a typical application of a VGA driving an ADC.
| Circuit Types: | ADC Circuit/Driver |
| Optimized For: | High Speed |
| Applications: | Communications; I&I; Medical |
Measuring −48 V High-Side Current Using the AD629 Difference Amplifier, AD8603 Op Amp, AD780 Reference, and AD7453 12-Bit ADC Single-Supply Components (CN0100)
Circuit Function and Benefits
The −48 V power rail is widely used in wireless base stations and telecommunication equipment. Used in network central offices, it can vary between −48 V and −60 V. Measuring the current at that voltage typically requires components that operate on dual supplies, such as ±15 V. Typically, only the front-end conditioning amplifiers that interface directly with the −48 V rail use dual supplies. The remainder of the system operates on single supplies. However, eliminating the negative supply reduces complexity and cost. Using the AD629 and the AD8603 in this circuit allows designers to measure current at −48 V to −60 V while operating only on positive supplies.
| Circuit Types: | ADC Circuit/Driver; Interface; Power |
| Optimized For: | High Precision; Low Noise and Distortion |
| Applications: | Communications; Motion Control |
Software Configurable 14-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using the AD5732 DAC (CN0093)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5732BREZ, a dual, 14-bit, serial input, unipolar/bipolar voltage output DAC and the REF192ESZ precision 2.5 V voltage reference. The only other external components needed for this 14-bit DAC circuit are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Temperature Stability |
| Applications: | I&I; Instrumentation; Process Control |
Software Configurable 16-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using the AD5752 DAC (CN0092)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5752BREZ, a dual, 16-bit, serial input, unipolar/bipolar voltage output DAC and the REF192ESZ precision 2.5 V voltage reference. The only other external components needed for this 16-bit DAC circuit are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Temperature Stability |
| Applications: | I&I; Instrumentation; Process Control |
Software Configurable 12-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using the AD5722 DAC (CN0094)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5722BREZ, a dual, 12-bit, serial input, unipolar/bipolar voltage output DAC and the REF192ESZ precision 2.5 V voltage reference. The only other external components needed for this 12-bit DAC circuit are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | Temperature Stability |
| Applications: | I&I; Instrumentation; Process Control |
Software Configurable 16-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using the AD5752R DAC (CN0089)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5752R, a dual, 16-bit, serial input, unipolar/bipolar voltage output DAC. The only external components needed for this 16-bit DAC are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Temperature Stability |
| Applications: | I&I; Instrumentation; Process Control |
Products Used in This Circuit:
AD5752R
AD5752R
Software Configurable 14-Bit Dual-Channel Unipolar/Bipolar Voltage Output Using the AD5732R DAC (CN0090)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5732R, a dual, 14-bit, serial input, unipolar/bipolar voltage output DAC. The only external components needed for this 14-bit DAC are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Temperature Stability |
| Applications: | I&I; Instrumentation; Process Control |
Products Used in This Circuit:
AD5732R
AD5732R
Software Configurable 14-Bit Quad-Channel Unipolar/Bipolar Voltage Output Using the AD5734R DAC (CN0084)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5734R, a quad, 14-bit, serial input, unipolar/bipolar voltage output DAC. The only external components needed for this 14-bit DAC are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution |
| Applications: | I&I; Instrumentation; Process Control |
Products Used in This Circuit:
AD5732R
AD5732R
Using the AD7150 Capacitance-to-Digital Converter (CDC) for Proximity Sensing Applications (CN0095)
Circuit Function and Benefits
The circuit described in this document provides the basis for developing a proximity sensing application using the AD7150 capacitance-to-digital converter (CDC).
| Circuit Types: | ADC Circuit/Driver; Interface |
| Optimized For: | High Resolution |
| Applications: | Automotive; Instrumentation; Process Control; Security & Surveillance |
Software Configurable 12-Bit Quad-Channel Unipolar/Bipolar Voltage Output Using the AD5724 DAC (CN0088)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5724BREZ, a quad, 12-bit, serial input, unipolar/bipolar voltage output DAC and the REF192ESZ precision 2.5 V voltage reference. The only other external components needed for this 12-bit DAC circuit are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | Multichannel |
| Optimized For: | Temperature Stability |
| Applications: | Instrumentation; Process Control |
Software Configurable 14-Bit Quad Channel Unipolar/Bipolar Voltage Output Using the AD5734 DAC (CN0087)
Circuit Function and Benefits
This circuit provides, unipolar and bipolar data conversion using the AD5734BREZ, a quad, 14-bit, serial input, unipolar/ bipolar voltage output DAC and the REF192ESZ precision 2.5 V voltage reference. The only other external components needed for this 14-bit DAC circuit are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | Multichannel |
| Optimized For: | High Resolution; Temperature Stability |
| Applications: | Instrumentation; Process Control |
Software Configurable 16-Bit Quad Channel Unipolar/Bipolar Voltage Output Using the AD5754 DAC (CN0086)
Circuit Function and Benefits
This circuit provides, unipolar and bipolar data conversion using the AD5754BREZ, a quad, 16-bit, serial input, unipolar/ bipolar voltage output DAC, and the REF192ESZ precision 2.5 V voltage reference. The only additional external components needed for this 16-bit DAC circuit are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | Multichannel |
| Optimized For: | High Resolution |
| Applications: | Instrumentation; Process Control |
Products Used in This Circuit:
AD5754
AD5754
Software Configurable 12-Bit Quad Channel Unipolar/Bipolar Voltage Output Using the AD5724R DAC (CN0085)
Circuit Function and Benefits
This circuit provides unipolar and bipolar data conversion using the AD5724R, a quad, 12-bit, serial input, unipolar/ bipolar voltage output DAC. The only external components needed for this 12-bit DAC are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | Multichannel |
| Applications: | Instrumentation; Process Control |
Products Used in This Circuit:
AD5724R
AD5724R
Software Configurable 16-Bit Quad-Channel Unipolar/Bipolar Voltage Output Using the AD5754R DAC (CN0083)
Circuit Function and Benefits
This circuit provides unipolar and bipolar digital-to-analog conversion using the AD5754R, a quad, 16-bit, serial input, unipolar/bipolar voltage output DAC. The only external components needed for this 16-bit DAC are decoupling capacitors on the supply pins and reference input, leading to savings in cost and board space. This circuit is well suited for closed-loop servo control applications.
| Circuit Types: | Multichannel |
| Applications: | Instrumentation; Process Control |
Products Used in This Circuit:
AD5754R
AD5754R
Simplified 12-Bit, 4 mA-to-20 mA Output Solution Using the AD5410 Current Source DAC (CN0081)
Circuit Function and Benefits
This circuit provides a 4 mA-to-20 mA output using the AD5410, a single channel, 12-bit, serial input, 4 mA-to-20 mA current source DAC. This circuit uses only the AD5410 product. The only external components needed are decoupling capacitors on the supply pins and reference input and a pull-up resistor for the open-drain FAULT output, which alerts to a loss of com-pliance voltage on the output or an overtemperature condition of the AD5410. This implementation offers a level of integration that leads to savings in both cost and board space. This circuit is well suited for both the programmable logic controllers (PLCs) and the distributed control systems (DCS) in industrial control applications.
| Circuit Types: | DAC Circuit |
| Applications: | Instrumentation; Process Control |
Products Used in This Circuit:
AD5410
AD5410
16-Bit Fully Isolated Output Module Using the AD5422 Single Chip Voltage and Current Output DAC and the ADuM1401 Digital Isolator (CN0065)
Circuit Function and Benefits
This circuit provides a complete solution for an industrial control output module. This design is suitable for process control programmable logic controllers (PLCs) and distributed control systems (DCSes) modules that require standard 4 mA-to-20 mA current outputs and unipolar or bipolar output voltage ranges. The AD5422 16-bit DAC is software configurable to provide all necessary outputs and has many integrated diagnostic features useful in an industrial environment. The ADuM1401 provides all the necessary signal isolation between the microcontroller and the DAC. The circuit also includes standard external protection and has been tested and verified to be fully compliant with the IEC 61000 specifications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Isolation |
| Applications: | Process Control |
Precision, AC Reference Signal Attenuator Using the AD5546/AD5556 Multiplying DAC (CN0025)
Circuit Function and Benefits
This circuit provides precision, ac signal attenuation using the AD5546/AD5556 DAC and the AD8610 precision operational amplifier. This circuit provides accurate, low noise, high speed output voltage capability and is well suited for process control, automatic test equipment, and digital calibration applications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution |
| Applications: | Instrumentation; Process Control |
Extending the Dynamic Range of the ADL5513 Logarithmic Detector Using the AD8368 Variable Gain Amplifier (CN0072)
Circuit Function and Benefits
This circuit provides a solution for increasing the dynamic range of the ADL5513 logarithmic detector. This is accomplished by adding an AD8368 variable gain amplifier (VGA) at the input of the ADL5513. The VOUT signal from the ADL5513 is attenuated and fed back to the gain control input of the AD8368, providing precise control of the power at the input of the ADL5513. Using this approach, the dynamic range of the circuit is increased to 95 dB with excellent temperature stability (see Figure 2). The output voltage is linear in dB with respect to the input signal.
| Circuit Types: | RF/IF Driver |
| Optimized For: | High Performance; Temperature Stability |
| Applications: | Communications |
Creating a Constant Envelope Signal Using the ADL5331 RFVGA and AD8319 Log Detector (CN0082)
Circuit Function and Benefits
Overall performance of a transmitter, wired or wireless, is a strong function of the output power of the amplifier. If the signal is weak, bit error rate (BER) or modulation error rate (MER) will degrade due to low SNR. If the signal is too strong, distortion will cause the same issues. This circuit uses the ADL5331 VGA, the AD8319 power detector, and the AD5621 low power nanoDAC to generate output power control accurate to 12 bits. The AD8319 has very high temperature stability to compensate for any gain variation over temperature of the VGA, resulting in very accurate power control over a wide temperature range. Because the AD8319 control input VSET and the output VOUT are related to the RF input on a volts/dB scale and the AD5621 nanoDAC has a linear transfer function, the resulting output power control will be a linear-in-dB vs. DAC input code.
| Circuit Types: | Power; RF/IF Driver |
| Applications: | Communications |
16-Bit Fully Isolated 4 mA to 20 mA Output Module Using the AD5662 DAC, ADuM1401 Digital Isolator, and External Amplifiers (CN0064)
Circuit Function and Benefits
This circuit provides a complete solution for an industrial control output module. This design is suitable for process control programmable logic controllers (PLCs) and distributed control system (DCS) modules and transmitters that require a 4 mA to 20 mA current output range. The AD5662 nanoDAC® is a 5 V16-bit DAC in a SOT-23 package. The ADuM1401 four-channel digital isolator provides all the necessary signal isolation between the microcontroller and the DAC. The circuit also includes standard external protection and has been tested and verified to be fully compliant with the IEC 61000 specifications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Isolation |
| Applications: | I&I; Instrumentation; Process Control |
16-Bit Fully Isolated Voltage Output Module Using the AD5662 DAC, ADuM1401 Digital Isolator, and External Amplifiers (CN0063)
Circuit Function and Benefits
This circuit provides a complete solution for an industrial control output module. This design is suitable for process control programmable logic controllers (PLCs) and distributed control systems (DCSes) that require bipolar output voltage ranges. The AD5662 nanoDAC® is a 5 V, 16-bit DAC in a SOT-23 package. The ADuM1401 four-channel digital isolator provides all the necessary signal isolation between the microcontroller and the DAC. The circuit also includes standard external protection and has been tested and verified to be fully compliant with the IEC 61000 specifications.
| Circuit Types: | DAC Circuit |
| Optimized For: | High Resolution; Isolation |
| Applications: | Instrumentation; Process Control |
Low Cost Video Multiplexer for Video Switching Using the ADA4853-2 Op Amp with Disable Function (CN0076)
Circuit Function and Benefits
This circuit provides a low cost, low power video multiplexer using the ADA4853-2, a dual high speed amplifier. It allows the user to input a fourth video source into a 3-channel video decoder like the 40-lead LFCSP ADV7180. This saves both cost and valuable board space by using a smaller, low cost decoder and allows design reuse if only three video sources are required in a similar design
| Circuit Types: | Switching |
| Applications: | Audio / Video; Automotive |
High Accuracy, Bipolar Voltage Output Digital-to-Analog Conversion Using the AD5763 DAC (CN0074)
Circuit Function and Benefits
This circuit provides high accuracy, bipolar data conversion using the AD5763, a dual, 16-bit, serial input, bipolar voltage output DAC. This circuit utilizes the ADR420 precision reference to achieve optimal DAC performance over a full operating temperature range. The only external components needed for this precision 16-bit DAC are a reference voltage source, decoupling capacitors on the supply pins and reference inputs, and an optional short-circuit current setting resistor. This implementation, therefore, leads to savings in cost and reduced board space. This circuit is well suited for both closed-loop servo control and open-loop control applications.
| Circuit Types: | DAC Circuit; Multichannel |
| Optimized For: | High Precision; High Resolution; Temperature Stability |
| Applications: | Building Controls; I&I; Instrumentation; Medical; Motion Control; Process Control |
Fully Isolated Input Module Based on the AD7793 24-Bit Σ-Δ ADC, the ADuM5401 Digital Isolator, and a High Performance In-Amp (CN0067)
Circuit Function and Benefits
This circuit provides a complete solution for an industrial control input module. This design is suitable for process control programmable logic controllers (PLCs) and distributed control systems (DCSes) modules that must digitize standard 4 mA to 20 mA current inputs and unipolar or bipolar input voltage ranges. The AD8220 in-amp is used to level shift the bipolar signals to provide a 0 V to 5 V input signal to the AD7793 ADC. The ADuM5401 provides all the necessary signal isolation and power between the microcontroller and the ADC. The circuit also includes standard external protection, and has been tested and verified to be fully compliant with the IEC61000 specifications.
| Circuit Types: | ADC Circuit/Driver |
| Optimized For: | High Resolution; Isolation |
| Applications: | Process Control |
Fully Isolated Input Module Based on the AD7793 24-Bit Σ-Δ ADC and the ADuM5401 Digital Isolator (CN0066)
Circuit Function and Benefits
This circuit provides a complete solution for a single-supply input circuit design requiring isolation. The AD7793 is a 24 bit Σ-Δ ADC. The ADC includes an on-chip PGA and can, therefore, accept small signal inputs from sensors directly. The PGA gains can be set for 1, 2, 4, 8, 16, 32, 64, or 128. The ADuM5401 provides all the necessary signal isolation and power between the microcontroller and the input. The circuit also includes standard external protection and has been tested and verified to be fully compliant with the IEC 61000 specifications.
| Circuit Types: | ADC Circuit/Driver |
| Optimized For: | High Resolution; Isolation |
| Applications: | Process Control |
Interfacing the ADL5382 Quadrature I/Q Demodulator to the AD9262 16-Bit Continuous Time Sigma-Delta ADC as an RF-to-Bits Solution (CN0062)
Circuit Function and Benefits
This two chip solution consisting of the ADL5382 and AD9262 provides an RF-to-bits solution with optimized performance, low cost, and minimal board space. This two chip combination uses a single frequency translation step to convert the RF channel directly to baseband without intermediate frequency translations. The frequency translation is accomplished by the ADL5382, a broadband quadrature I/Q demodulator that covers the RF input frequency range from 700 MHz to 2.7 GHz. The ADL5382 is followed by the AD9262, which is a 16-bit dual continuous time Σ-Δ ADC. The characteristics of the continuous time Σ-Δ architecture allow the demodulator to directly connect with the ADC, therefore, relaxing the ADC drive and antialiasing requirements. This circuit is easy to use and requires minimal supporting circuitry and board space.
| Circuit Types: | ADC Circuit/Driver; RF/IF Driver |
| Optimized For: | High Resolution; High Speed |
| Applications: | Communications; Medical |
High Accuracy, Bipolar Voltage Output Digital-to-Analog Conversion Using the AD5765 DAC (CN0073)
Circuit Function and Benefits
This circuit provides high accuracy, bipolar data conversion using the AD5765, a quad, 16-bit, serial input, bipolar voltage output DAC. This circuit utilizes the ADR420 precision reference to achieve optimal DAC performance over a full operating temperature range. The only external components needed for this precision 16-bit DAC are a reference voltage source, decoupling capacitors on the supply pins and reference inputs, and an optional short-circuit current-setting resistor. This implementation, therefore, leads to savings in cost and reduced board space. The circuit is well suited for both closed-loop servo control and open-loop control applications.
| Circuit Types: | DAC Circuit; Multichannel |
| Optimized For: | High Precision; High Resolution; Temperature Stability |
| Applications: | Building Controls; I&I; Instrumentation; Medical; Motion Control; Process Control |
Half-Duplex, Isolated RS-485 Interface (CN0031)
Circuit Function and Benefits
This circuit provides a half-duplex, isolated RS-485 interface using the ADM2485 high speed, isolated RS-485 transceiver and the ADP3330 high accuracy linear regulator. This circuit achieves signal and power isolation and at the same time decreases board space and power consumption.
| Circuit Types: | Interface |
| Optimized For: | Isolation |
| Applications: | Instrumentation; Process Control |
8 to 16 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using the AD5390/AD5391/AD5392 DACs (CN0029)
Circuit Function and Benefits
This circuit is a multichannel DAC configuration with excellent temperature drift performance. It utilizes the AD5390/AD5391/AD5392 to provide between 8 and 16 DAC channels with 12 to 14 bits of resolution. The ADR421/ADR431 precision voltage reference ensures that the temperature stability of the circuit is typically less than 3 ppm/°C.
| Circuit Types: | Multichannel |
| Optimized For: | High Performance; High Precision; Temperature Stability |
| Applications: | Instrumentation; Process Control |
AD5390/AD5391/AD5392 Channel Monitor Function (CN0030)
Circuit Function and Benefits
In a multichannel DAC system, the ability to monitor all outputs at a single point is a significant advantage for troubleshooting and diagnostic analysis. This circuit provides multichannel DAC output channel monitoring using a single-channel SAR ADC.
| Circuit Types: | Multichannel |
| Optimized For: | High Performance; High Precision; Temperature Stability |
| Applications: | Instrumentation; Process Control |
Precision, Bipolar Configuration for the AD5546/AD5556 DAC (CN0024)
Circuit Function and Benefits
This circuit provides precision, bipolar data conversion using the AD5546/AD5556 current output DAC with the ADR01 10 V precision reference and AD8512 operational amplifier (op amp). This circuit provides accurate, low noise, high speed output voltage capability and is well suited for process control, automatic test equipment, and digital calibration applications.
| Circuit Types: | Multiplying |
| Optimized For: | High Performance; High Precision |
| Applications: | Instrumentation; Process Control |
Precision, Bipolar, Configuration for the AD5547/AD5557 DAC (CN0028)
Circuit Function and Benefits
This circuit provides precision, bipolar data conversion using the AD5547/AD5557 current output DAC with the ADR01 precision reference and AD8512 operational amplifier (op amp). This circuit provides accurate, low noise, high speed output voltage capability and is well suited for process control, automatic test equipment, and digital calibration applications.
| Circuit Types: | Multiplying |
| Optimized For: | High Performance; High Precision |
| Applications: | Instrumentation; Process Control |
Precision, Unipolar, Noninverting Configuration for the AD5547/AD5557 DAC (CN0027)
Circuit Function and Benefits
This circuit provides precision, unipolar, noninverting data conversion using the AD5547/AD5557 current output DAC with the ADR03 precision reference and AD8628 operational amplifier (op amp). This circuit provides accurate, low noise, high speed output voltage capability and is well suited for process control, automatic test equipment, and digital calibration applications.
| Circuit Types: | Multiplying |
| Optimized For: | High Performance; High Precision |
| Applications: | Instrumentation; Process Control |
Precision, Unipolar, Inverting Conversion Using the AD5547/AD5557 DAC (CN0026)
Circuit Function and Benefits
This circuit provides precision, unipolar, inverting data conversion using the AD5547/AD5557 current output DAC with the ADR03 precision reference and AD8628 operational amplifier (op amp). This circuit provides accurate, low noise, high speed output voltage capability and is well suited for process control, automatic test equipment, and digital calibration applications.
| Circuit Types: | Multiplying |
| Optimized For: | High Performance; High Precision |
| Applications: | Instrumentation; Process Control |