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This 17-page Application Note introduces the main features of the ADSP-CM408F’s analog-to-digital converter controller (ADCC), focusing on current feedback systems in high performance motor control applications. It highlights key capabilities of the analog-to-digital converter (ADC) module, guides configuration for motor control applications, and provides code samples for the ADCC drivers.
This 6-page Application Note describes a technique for autonomously detecting and capturing shock events using a low power, high-g, 3-axis digital MEMS accelerometer with minimal intervention from the host processor. The accelerometer can be programmed to monitor single or double (primary and secondary) shocks along any combination of X, Y, and/or Z axes. In addition, the entire shock profile can be captured for further analysis using an integrated 32 sample memory.
This 16-page Application Note introduces the main features of the ADSP-CM40xF’s SINC filters, focusing on high performance motor control applications. It highlights the key capabilities of the SINC filter and shows usage of the SINC filter drivers. Each SINC filter is part of a complete motor current feedback subsystem that includes a current shunt, a modulator to digitize and isolate the signal, and the SINC filter to decode the bit stream and present it to the controller.
This 16-page application note explains the process of calibrating a 3-phase energy meter built around the ADE7978 and ADE7932/ADE7933 isolated metering chipset. A single 3.3-V supply powers the chipset. Three isolated ADCs sense phase currents using shunts and phase-to-neutral voltages using resistor dividers. A microcontroller manages the ADCs via I2C or SPI.
The ADP1046A secondary side digital power controller features analog-to-digital converters, integrated I2C communication, analog comparators, and digital compensation. Layout is crucial for complex mixed signal devices with closely spaced input and output functions, so proper care must be taken to avoid hazards. This 7-page Application Note provides guidelines to avoid noise coupling and techniques for proper grounding.
The AD5933 and AD5934 high precision impedance converter network analyzers are finite systems with some limitations. This 11-page Application Note explains the optimum measurement setup.
This 6-page Application Note describes how to connect evaluation boards to collect high accuracy digital temperature readings from the ADT7310/ADT7410 sensors using Cortex-M3® based precision analog microcontrollers, such as the ADuCM360. Example code shows how the microcontroller and temperature sensor can communicate using I2C and SPI interfaces.
This circuit provides unipolar and bipolar data conversion using the AD5754BREZ 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 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.
This circuit provides unipolar and bipolar digital-to-analog conversion using the AD5754R quad 16-bit, serial input, unipolar/bipolar voltage output DAC. The only external components needed 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.
This circuit provides unipolar/bipolar voltage and 4 mA-to-20 mA outputs using the AD5422 single channel, 16-bit, serial input, unipolar/bipolar voltage and 4 mA-to-20 mA current source DAC. 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 condition. This solution offers a level of integration that leads to savings in both cost and board space, making it well suited for programmable logic controllers and distributed control systems in industrial control applications.
This circuit provides high accuracy, bipolar data conversion using the AD5765 quad 16‑bit, serial input, bipolar voltage output, digital-to-analog converter (DAC). This circuit uses the ADR420 precision reference to achieve optimal DAC performance over a full operating temperature range. The only external components needed for this precision DAC are a reference voltage, 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.
This multichannel DAC configuration has excellent temperature drift. It uses the AD5390/AD5391/AD5392 to provide 8 to 16 DAC channels with 12-bit to 14-bit resolution. The ADR421/ADR431 precision voltage reference ensures that the temperature stability of the circuit is typically less than 3 ppm/°C.
This multichannel DAC configuration has excellent temperature drift. It provides 40 individual output voltage channels with 14-bit resolution and less than 3‑ppm/°C typical temperature stability.
This completely isolated low power pH sensor signal conditioner and digitizer with automatic temperature compensation achieves 0.5% accuracy for pH between 0 and 14, with greater than 14-bits of noise-free code resolution, making it suitable for a variety of industrial applications such as chemical, food processing, water, and wastewater analysis. It supports a wide variety of pH sensors with internal resistance that can range from 1 MΩ to several GΩ. Digital signal and power isolation provides immunity to noise and transient voltages often encountered in harsh industrial environments.
This circuit provides two, 16-bit, fully isolated, universal analog input channels suitable for programmable logic controller (PLC) and distributed control system (DCS) modules. Both channels are software programmable and support a number of voltage and current ranges and thermocouple and RTD types. The inputs are protected for dc overvoltage conditions of ±30 V. The demonstration board contains two fully isolated universal input channels: in one, the voltage, current, thermocouple, and RTD inputs all share the same terminals to minimize the number of pins required; in the other, separate terminals for voltage/current inputs and thermocouple/RTD inputs provides a lower part count and component cost.
This contactless, AMR (anisotropic magnetoresistive) angle measurement solution provides 1° angular accuracy over a 180° range, making it ideal for applications that require accurate, high speed, non-contact angle measurements. The full signal chain, which includes instrumentation amplifiers, buffers, and a dual channel ADC, efficiently processes the AMR sensor’s low level bridge outputs. The result is an industry leading angle measurement solution suitable for machine tool speed control, crane angle control, motor speed measurement, and other applications.
This complete, fully isolated, analog output channel is suitable for programmable logic controllers (PLCs) and distributed control system (DCS) modules that require standard 4 mA to 20 mA HART®-compatible current outputs and unipolar or bipolar output voltage ranges. It provides a flexible building block for channel-to-channel isolated PLC/DCS output modules or any other industrial application that requires a fully isolated analog output. The circuit also includes external protection on the analog output terminals. The AD5422 16-bit digital-to-analog converter (DAC) is software configurable and provides all the necessary current and voltage outputs. The AD5700-1 HART-compliant modem, used in conjunction with the AD5422, forms a complete HART-compatible 4 mA to 20 mA solution. The AD5700-1 includes a precision internal oscillator that provides additional space savings, especially in channel-to-channel isolated applications.
This circuit provides a low cost solution to temperature monitoring because most of the circuit functionality is integrated into the ADuCM360 precision analog microcontroller, including dual 24-bit Σ-Δ ADCs, the ARM Cortex™-M3 processor core, and the PWM/DAC features for controlling the 4 mA-to-20 mA loop for loop voltages up to 28 V.
This 16-bit, ultra-stable, low-noise, precision, bipolar (±10 V) voltage source requires a minimum number of precision external components. It features ±0.5 LSB maximum integral nonlinearity (INL) and differential nonlinearity (DNL) with the AD5760 voltage-output DAC (B-grade). The complete system has less than 0.1-LSB p-p noise and drift measured over a 100-second interval. The circuit is ideal for medical instrumentation, test and measurement, and industrial control applications where precision low drift voltage sources are required.
This dual-channel colorimeter, which features a modulated light source transmitter and a synchronous detector receiver, measures the ratio of light absorbed by the sample and reference containers at three different wavelengths, providing an efficient solution for many chemical analysis and environmental monitoring instruments that measure concentrations and characterize materials through absorption spectroscopy.
This circuit offers a high linearity, low noise, wide-bandwidth vibration sensing solution that is ideal for applications, such as bearing analysis, engine monitoring, and shock detection, that require high dynamic range (±70 g to ±500 g) and flat frequency response to 22 kHz.
This complete adjustment-free linear variable differential transformer (LVDT) signal conditioning circuit can accurately measure linear displacement (position). The LVDT is a highly reliable sensor because the magnetic core can move without friction and does not touch the inside of the tube. Therefore, LVDTs are suitable for flight control feedback systems, position feedback in servomechanisms, automated measurement in machine tools, and many other industrial and scientific electromechanical applications where long term reliability is important. This circuit uses the AD698 LVDT signal conditioner, which contains a sine wave oscillator and a power amplifier to generate the excitation signals that drive the primary side of the LVDT. The AD698 also converts the secondary output into a dc voltage. The AD8615 rail-to-rail amplifier buffers the output of the AD698 and drives a low power 12-bit successive approximation analog-to-digital converter (ADC). The system has 82-dB dynamic range and 250-Hz system bandwidth, making it ideal for precision industrial position and gauging applications.
This circuit uses the ADuCM360 precision analog microcontroller in an accurate thermocouple temperature monitoring application and controls the 4-mA to 20-mA output current. The ADuCM360 integrates two 24-bit sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), two programmable current sources, a 12-bit digital-to-analog converter (DAC), and a 1.2 V internal reference, as well as an ARM Cortex-M3 core, 126 kB flash, 8 kB SRAM, and various digital peripherals, such as UART, timers, SPIs, and I2C interfaces. The ADuCM360 is connected to a type-T thermocouple and a 100-Ω platinum resistance temperature detector, which is used for cold junction compensation. The low power Cortex-M3 core converts the ADC readings to a real temperature value. The −200°C to +350°C type-T temperature range is converted to a 4-mA to 20-mA output current. The loop-powered circuit provides a complete solution for thermocouple measurements with a minimum requirement for external components.
This flexible current transmitter converts the differential voltage output from a pressure sensor to a 4-mA to 20-mA current. Optimized for a wide variety of bridge-based voltage or current driven pressure sensors, it utilizes only five active devices and has a total unadjusted error of less than 1%. The power supply voltage can range from 7 V to 36 V depending on the component and sensor driver configuration. The input of the circuit is protected for ESD and voltages beyond the supply rail, making it ideal for industrial applications.
This robust, flexible loop-powered current transmitter converts the differential voltage output from a pressure sensor to a 4 mA-to-20 mA current output. Optimized for a wide variety of bridge based voltage or current driven pressure sensors, the design uses only four active devices and has a total unadjusted error of less than 1%. The loop supply voltage can range from 12 V to 36 V. The input of the circuit is protected for ESD and voltages beyond the supply rail, making it ideal for industrial applications.
This complete, adjustment-free, linear variable differential transformer (LVDT) signal conditioning circuit can accurately measure linear displacement (position). It uses the AD598 LVDT signal conditioner, which integrates a sine wave oscillator and a power amplifier to generate the excitation signals that drive the primary side of the LVDT. The system has 82-dB dynamic range and 250-Hz bandwidth, making it ideal for precision industrial position and gauging applications. This Circuit Note discusses basic LVDT theory and the design steps used to optimize the circuit for a chosen bandwidth.
This completely isolated 4-channel temperature measurement circuit, optimized for performance, input flexibility, robustness, and low cost, supports all types of thermocouples with cold-junction compensation and 2-, 3-, or 4-wire RTDs with resistances up to 4 kΩ. The RTD excitation current is programmable for optimum noise and linearity. RTD measurements achieve 0.1°C typical accuracy, and Type-K thermocouple measurements achieve 0.05°C typical accuracy. The circuit uses a 4-channel AD7193 24-bit sigma-delta ADC with on-chip PGA for high accuracy and low noise. Input transient and overvoltage protection are provided by low-leakage transient voltage suppressors and Schottky diodes. The SPI-compatible digital inputs and outputs are isolated to 2500 V rms, and the circuit operates on a fully isolated power supply.
This completely isolated current sensor with isolated power source is highly robust and can be mounted close to the sense resistor for accurate measurements and minimum noise pickup. The 16-MHz output data stream from a sigma-delta modulator is processed by a DSP using a SINC3 digital filter. Ideal for monitoring the ac current in solar photovoltaic (PV) converters, the circuit can handle peak ac voltages of several hundred volts and currents between a few mA and 25 A.
This complete high-performance resolver-to-digital (RDC) circuit accurately measures angular position and velocity in automotive, avionics, and critical industrial applications where high reliability is required over a wide temperature range. The innovative resolver rotor driver circuit has two modes of operation: high performance and low power. In high-performance mode, the system operates on a 12-V supply and can supply 6.4 V rms (18 V p-p) to the resolver. In low-power mode, the system operates on a 6-V supply and can supply 3.2 V rms (9.2 V p-p) to the resolver, while drawing less than 100 mA. Active filtering is provided in both driver and receiver to minimize the effects of quantization noise. The maximum tracking rate is 3125 rps in 10-bit mode (resolution = 21 arc min) and 156.25 rps in 16-bit mode (resolution = 19.8 arc sec).
This high-performance multichannel data acquisition circuit has been optimized for fast channel-to-channel switching with industrial signal levels. It can process 16 single-ended channels or eight differential channels, with 18-bit resolution at sampling rates up to 1.33 MSPS. A 250-kHz channel-to-channel switching rate provides 16-bit performance, making it an ideal solution for multichannel data acquisition in process control and power line monitoring applications.
Precision Angular Rate Sensor has ±1000°/sec dynamic range
The ADIS16137 high-performance iSensor® digital gyroscope operates autonomously, requiring no user configuration to produce accurate rate-sensing data, providing in-run bias stability of 2.8°/hr across a 400-Hz bandwidth. The signal chain is characterized for sensitivity and bias from –40°C to +85°C, eliminating the need for system level calibration in many applications. The device combines iMEMS® technology with signal conditioning that optimizes dynamic performance. Supporting data rates up to 2048 SPS, it offers an averaging/decimation filter structure that optimizes noise vs. bandwidth. Its low noise, wide bandwidth, and high stability make it ideal for platform control, navigation, robotics, and medical instrumentation. Operating on a single 4.75-V to 5.25-V supply, the ADIS16137 draws 120 mA in normal mode and 40 mA in sleep mode. Its 36-mm × 44-mm × 14-mm package with 24-lead connector is pin compatible with the ADIS16133, ADIS16135, and ADIS16136. Specified from –40°C to +105°C, the ADIS16137 is priced at $689.00 in 1000s.
Micropower Accelerometer and Temperature Sensor
ADXL363 combines a 3-axis MEMS accelerometer, a
temperature sensor, and a 12-bit ADC that allows synchronous conversion of
an external input. The accelerometer provides selectable ±2-g, ±4-g,
and ±8-g measurement ranges, with
Single-supply, low-power, precision quad FET-input Buffer
The AD8244 precision, low-power, quad FET-input buffer isolates very large source impedances from the rest of the signal chain. With 2 pA max bias current and 10 TΩ input impedance, it introduces minimal error, even with MΩ source impedances. Its unique pinout physically separates the high impedance inputs from the supplies and outputs, simplifying guarding, reducing board space, and improving performance. Close channel-to-channel matching minimizes errors in differential signal chains; and its low noise, wide supply range, and high precision make it flexible enough to provide high performance anywhere a unity-gain buffer is needed, even with low source resistance. Operating with 3-V to 36-V or ±1.5-V to ±18-V supplies, the AD8244 draws 180 μA per amplifier. Available in a 10-lead MSOP package, it is specified from –40°C to +85°C and priced from $1.81 in 1000s.
Quad high-precision Op Amp features low offset, wide bandwidth, and low noise
The ADA4077-4 quad operational amplifier features 50-µV max offset, 0.55-µV/°C max drift, 1-nA max input bias current, 3.9-MHz bandwidth, 1.2-V/µs slew rate, 7-nV/√Hz noise, and outputs that are stable with capacitive loads to beyond 1000 pF with no external compensation. This combination of specifications makes the amplifier ideal for sensor signal conditioning, process control front ends, portable instrumentation, and precision filters. Operating on a ±2.5-V to ±15-V supply, the ADA4077-4 draws 400 μA per amplifier. Specified from –40°C to +125°C—with MSL1 rating for the most demanding operating environments—it is available in 14-lead SOIC and TSSOP packages and is priced at $2.90 in 1000s.
Low-power, 8-/16-channel, 24-bit, 31.25-kSPS Sigma-Delta ADC
multiplexes 8 differential or 16
single-ended low-bandwidth input signals to a 24-bit, 31.25-kSPS sigma-delta
ADC. It achieves 24 noise free bits at 1.25 SPS. Functionally complete, it
integrates analog input buffers, reference buffers, low-dropout regulators,
a temperature sensor, crystal and internal clock oscillator circuitry, and a
precision, low-drift (3.5 ppm/°C), 2.5-V reference. Eight flexible setups
enable user configurable data rate, digital filter mode, offset and gain
error correction, reference selection, buffer enable, and more. Digital
filters maximize channel scan rate, resolution, and 50-/60-Hz rejection.
Additional features include CRC, register checksum, burnout currents, and
GPIOs/GPOs. Operating with a 3.3-V or 5-V supply, the
16-channel, 14-bit, 65-MSPS, Pipelined ADC has serial LVDS interface
The AD9249 includes 16 ADCs and a buffered voltage reference in a single package. Each channel includes a sample-and-hold, a 14-bit, 65-MSPS ADC, and an LVDS interface. Functionally complete, it only requires a power supply and a sample rate clock for full performance operation. Optimized for outstanding dynamic performance, low power, small size, and ease of use, no external reference or driver components are required for many applications. It automatically multiplies the sample rate clock for the appropriate LVDS serial data rate. Programmable features including clock and data alignment and digital test pattern generation maximize flexibility and minimize system cost. Operating with a 1.7-V to 1.9-V supply, the AD9249 dissipates 924 mW in ANSI-644 mode, 869 mW in reduced-range mode, 199 mW in standby mode, and 2 mW in power-down mode. Available in an RoHS-compliant 144-ball CSP-BGA package, it is specified from –40°C to +85°C and priced at $113.86 in 1000s.
8-channel, 14-bit, 65-MSPS, Pipelined ADC has serial LVDS interface
The AD9681 includes eight ADCs and a buffered voltage reference in a single package. Each channel includes a sample-and-hold, a 14-bit, 125-MSPS ADC, and an LVDS interface. Functionally complete, it only requires a power supply and a sample rate clock for full performance operation. Optimized for outstanding dynamic performance, low power, small size, and ease of use, no external reference or driver components are required for many applications. It automatically multiplies the sample rate clock for the appropriate LVDS serial data rate. Programmable features including clock and data alignment and digital test pattern generation maximize flexibility and minimize system cost. Operating with a 1.7-V to 1.9-V supply, the AD9681 dissipates 879 mW in ANSI-644 mode, 825 mW in reduced-range mode, 485 mW in standby mode, and 2 mW in power-down mode. Available in an RoHS-compliant 144-ball CSP-BGA package, it is specified from –40°C to +85°C and priced at $197.20 in 1000s.
2-/3-channel Isolated Sigma-Delta ADC with SPI
The ADE7912 and ADE7913 sigma-delta ADCs use iCoupler® technology to isolate both data and power in polyphase energy meters. The isolated dc-to-dc converter provides regulated power for the ADCs, eliminating the need for an external dc-to-dc isolation block, while chip-scale transformers isolate the logic signals, resulting in a small form factor, total isolation solution. The ADE7912 measures one voltage channel, sensed via a resistor divider, and one current channel, sensed via a shunt resistor; the ADE7913 adds a second voltage channel. An internal sensor measures the die temperature using one of the voltage channels. With a 3-kHz signal bandwidth, the voltage/current ADCs feature 72-/67-dB signal-to-noise ratio. Operating on a single 2.97-V to 3.63-V supply, the ADE7912/ADE7913 draw 12.5 mA in normal mode, 2.7 mA with modulators shut down, and 50 µA with modulators and clock shut down. Available in 20-lead SOIC packages, they are specified from –40°C to +85°C and priced at $5.42/$5.71 in 1000s.
Isolated Energy Metering Chipset for polyphase meters
The ADE7978 and ADE7932/ADE7933 chipset measures 3-phase electrical energy. The ADE7932 and ADE7933 sigma-delta ADCs use iCoupler® technology to isolate both data and power in polyphase energy meters. The isolated dc-to-dc converter provides regulated power for the ADCs, eliminating the need for an external dc-to-dc isolation block, while chip-scale transformers isolate the logic signals, resulting in a small form factor, total isolation solution. The ADE7932 measures one voltage channel, sensed via a resistor divider, and one current channel, sensed via a shunt resistor; the ADE7933 adds a second voltage channel. An internal sensor measures the die temperature using one of the voltage channels. With a 3-kHz signal bandwidth, the voltage/current ADCs feature 72-/67-dB signal-to-noise ratio. The digital interface is specially designed to interface with the ADE7978 energy measurement IC, which incorporates all functions required to calculate total (fundamental and harmonic) active, reactive, and apparent energy and rms values, as well as fundamental-only active and reactive energy and rms values using a fixed-function digital signal processor. The chipset measures energy in 3-phase wye and delta configurations using three or four wires, and provides system calibration for phase, gain, and offset correction. Operating on a single 2.97-V to 3.63-V supply, it is specified from –40°C to +85°C. The ADE7978 draws 10.6 mA, is available in a 28-lead LFCSP package, and is priced at $1.90 in 1000s. The ADE7932/ADE7933 draw 12.5 mA in normal mode, 2.7 mA with modulators shut down, and 50 µA with modulators and clock shut down. Available in 20-lead SOIC packages, they are priced at $5.42/$5.71 in 1000s.
16-bit, 1600-MSPS TxDAC+ Digital-to-Analog Converter
The AD9139 16-bit, 1600-MSPS TxDAC+® digital-to-analog converter enables multicarrier signal generation at frequencies up to Nyquist. Optimized for direct-conversion transmit applications, it includes 1×/2× interpolation, a high-speed interface, sample error detection, and parity detection. The 3-wire serial port interface facilitates programming/readback of many internal parameters. The full-scale output current can be programmed in the 9‑mA to 33-mA range. Operating on 1.8-V and 3.3-V supplies, the AD9139 dissipates 1.15 W at 1600 MSPS, 440 mW at 614 MHz, and 57.3 mW in power-down mode. Available in a 72-lead LFCSP package, it is specified from –40°C to +85°C and priced at $25.87 in 1000s.
Four-channel Digital Isolators provide 2.5-kV reinforced isolation
The ADuM1440/ADuM1441/ADuM1442 and ADuM1445/ADuM1446/ADuM1447 four-channel digital isolators provide superior performance, lower cost, and lower power consumption than optocouplers. Their patented iCoupler® technology combines high-speed CMOS with chip-scale transformers. Providing 2.5-kV reinforced isolation, they meet the safety- and regulatory requirements of UL, CSA, and VDE. Featuring 8‑ns pulse-width distortion, 10-ns channel-to-channel mismatch, and 25‑kV/μs common-mode transient immunity, they operate at data rates from dc to 2 Mbps. The power supplies on each side can range from 2.25 V to 3.6 V, allowing level-translation across the isolation barrier. Refresh circuitry, which ensures correct output data in the absence of input transitions, can be disabled to minimize power consumption. When refresh and watchdog functions are enabled, the ADuM1440/41/42 default to logic high; and the ADuM1445/46/47 default to logic low. The ADuM1440/45 have four channels that communicate in the same direction; the ADuM1441/46 have one channel that communicates in one direction and three that communicate in the reverse direction; and the ADuM1442/47 have two channels that communicate in one direction and two that communicate in the reverse direction. Available in 16-lead QSOP packages, the ADuM144x are specified from –40°C to +125°C and priced at $1.98 in 1000s.
Isolated Half-Bridge Driver provides 4-A peak output currents
The ADuM7223 isolated half-bridge gate driver uses iCoupler® technology to provide independent, isolated outputs for driving the gates of the high-side and low-side IGBT and MOSFET devices used in motor control, switching power supplies, and industrial inverters. Combining high-speed CMOS with chip-scale transformer technology, the device provides precise timing, high reliability, and better overall performance than optocouplers or pulse transformers. Each output may be continuously operated up to 565 VPEAK relative to the input, thereby supporting low-side switching to negative voltages. The differential voltage between the high side and low side may be as high as 700 VPEAK. The CMOS-compatible inputs provide 25-kV/μs common-mode transient immunity, and the outputs can drive 4-A peak currents at voltages from 4.5 V to 18 V. Switching at up to 1 MHz, the driver features 60-ns max propagation delay and 8.5 ns max channel-to-channel mismatch. The ADuM7223 operates with a 3.0-V to 5.5-V input supply, providing compatibility with lower voltage systems. Specified from –40°C to +125°C, it is available in a 5-mm × 5-mm LGA package and priced at $1.51 in 1000s.
Four-string white LED Driver for LCD backlight applications
The ADD5211 white-LED driver uses a high-efficiency, current-mode step-up converter to provide four regulated constant-current sources—each capable of driving 40 mA to 200 mA—to illuminate four strings of series-connected LEDs in backlight applications. The LED current is set by an external resistor and the 0.45% current matching ensures uniform LED brightness. The boost controller operates with a 200-kHz to 1.2-MHz switching frequency. An adjustable UVLO function reduces input current during power down. Additional features include LED short protection, LED open protection, boost output short protection, overvoltage protection, cycle-by-cycle current limit, and thermal shutdown for both the IC and the LED array. An open-drain fault output is also included. Programmable soft start reduces inrush current during startup. Operating with a 4.5-V to 40-V supply, the ADD5211 draws 2.8 mA in normal mode and 1 µA in shutdown mode. Specified from –40°C to +125°C, it is available in a 24-lead LFCSP package and priced at $1.40 in 1000s.
Supervisory Circuits with watchdog and manual reset
The ADM8316, ADM8318, ADM8319, ADM8320, ADM8321, and ADM8322 supervisory circuits monitor power supply voltage levels and code execution integrity in microprocessor-based systems. An on-chip watchdog timer provides power-on reset signals and resets the microprocessor if it fails to strobe within a preset timeout period. The reset signal can also be asserted by an external push button through a manual reset input. The six devices feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in the table. Each device is available in a choice of 26 reset threshold options ranging from 2.5 V to 5 V in 100-mV increments. Four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) and four watchdog timeout options of 6.3 ms, 102 ms, 1600 ms, and 25.6 sec (typical) provide additional flexibility. Available in 5-lead SOT-23 packages, the ADM831x are specified from –40°C to +125°C and priced at $0.69 in 1000s.
Supervisory Circuits with windowed watchdog and manual reset
The ADM8323 and ADM8324 supervisory circuits monitor power supply voltage levels and code execution integrity in microprocessor-based systems. An on-chip watchdog timer checks for activity within a preset timeout window. The watchdog timeout period is measured from the falling edge of the watchdog input. A failure, which can be triggered by watchdog pulses that are too close or an absence of watchdog pulses, results in a low output on the reset pin. A reset signal can also be asserted by an external push button through a manual reset input. The reset output is push-pull on the ADM8323 and open-drain on the ADM8324. Each device is available in a choice of 26 reset threshold options from 2.5 V to 5 V in 100-mV increments. Four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (minimum) increase flexibility. Available in 5-lead SOT-23 packages, the ADM8323/24 are specified from –40°C to +125°C and priced at $0.79 in 1000s.
Ultralow-noise, high PSRR Regulators provides 800-mA output current
The ADM7150 and ADM7151 low-dropout linear regulators operate from 4.5 V to 16 V and provide up to 800 mA of output current. Using an advanced proprietary architecture, they provide high power supply rejection, low noise, and excellent transient response with a 10-μF ceramic output capacitor. The ADM7150 is available in 16 fixed-output-voltage versions between 1.5 V and 5.0 V. The output voltage of the ADM7151 can be set to any voltage between 1.5 V and 5.1 V with two external resistors. It is available in two models that optimize power dissipation and PSRR as a function of input and output voltage. Typical output noise is 1.0-μV rms from 100 Hz to 100 kHz and 1.7-nV/√Hz noise spectral density above 10 kHz. The regulators offer an ideal power solution for PLLs, microwave VCOs, PLLs with integrated VCOs, wideband RF transceivers, clocks, high-speed and precision ADC/DACs, and AFEs. The low output noise spectral density significantly reduces phase noise when powering VCO circuits, and reduces jitter when powering clocks, OCXO, and clock distribution devices. The small package provides a compact solution with excellent thermal performance. Available in 8-lead LFCSP and SOIC packages, the ADM7150/51 are specified from –40°C to +125°C and priced at $3.64 in 1000s.
4-channel Integrated Power Solution includes two buck regulators, two LDOs
The ADP5134 integrated power solution combines two high-performance buck regulators and two low-dropout regulators (LDOs). The buck regulators can use forced pulse-width modulation (PWM), or switch to power-save mode (PSM) to improve efficiency with light loads. The two bucks operate out of phase to reduce the input capacitor requirement. Their high switching frequency enables the use of tiny external components and minimizes PCB area. The LDOs maintain greater than 60-dB power supply rejection for frequencies up to 10 kHz while operating with only 500 mV of headroom. Their low quiescent current, low dropout voltage, and wide input voltage range extend battery life in portable devices. Output voltages are externally set in the adjustable-output version or factory programmed over a wide range of preset values in the fixed-output version. Each regulator can be enabled independently using individual precision enable pins. The enable pins and dedicated power good pin simplify power supply sequencing for FPGAs and processors. Available in a 24-lead LFCSP package, the ADP5134 is specified with a –40°C to +125°C junction temperature and priced at $2.09 in 1000s.
High-voltage, latch-up proof, Dual SPST Switches
The ADG5421 and ADG5423 latch-up immune CMOS analog switches contain two independent single-pole/single-throw (SPST) switches. Each switch conducts equally well in both directions when on, and blocks signal levels up to the supplies when off. The input signal range extends to the power supplies. Their ultralow on resistance and on-resistance flatness make the switches ideal for data acquisition and gain switching applications where low distortion is critical; and their latch-up immune construction and 8-kV HBM ESD rating increase their robustness in harsh environments. The ADG5421 has two switches that are turned on with a Logic 1 input. The ADG5423 has one switch that is turned on with a Logic 1 input and one switch that is turned off; break-before-make switching action makes it useful in multiplexer applications. Operating on 9-V to 40-V or ±9-V to ±22-V supplies, the ADG5421/23 draw 130 µA max. Specified from –40°C to +125°C, they are available in 10-lead MSOP packages and priced at $1.85 in 1000s.
High-voltage latch-up proof, Single SPST/SPDT Switches
The ADG5401 and ADG5419 latch-up immune CMOS analog switches are available in single-pole/single-throw (SPST) and single-pole/double-throw (SPDT) configurations. They conduct equally well in both directions when on and block signal levels up to the supplies when off. The input signal range extends to the power supplies. Their ultralow on resistance and on-resistance flatness make them ideal for data acquisition and gain switching applications where low distortion is critical; and their latch-up immune construction and high ESD rating increases their robustness in harsh environments. The ADG5419 exhibits break-before-make switching action for use in multiplexer applications. Operating on 9-V to 40-V or ±9-V to ±22-V supplies, the ADG5401/ADG5419 draws 130 µA max. Specified from –40°C to +125°C, they are available in 8-lead MSOP packages and priced at $1.60/$1.71 in 1000s.
High-voltage precision Operational Amplifier
ADA4700-1 high-voltage, precision operational
amplifier specifies 200-µV offset, 30-mA output current drive, 3.5-MHz
bandwidth, 20-V/µs slew rate, rail-to-rail operation, and unity-gain
stability, making it ideal for applications requiring both dc precision and
ac performance, including high-voltage test equipment, instrumentation,
regulators, power amplifiers, power supply control and protection, and
transducer buffers. It is particularly well suited for high-intensity LED
testing applications, where it provides high-accuracy voltage and current
feedback. Operating with a ±4.5-V to ±55-V supply, it draws 1.7 mA.
Available in an
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Model-Based Design For Motor Control Development - This webcast gives an introduction to model-based design (MBD) and discusses how this design approach can speed up time-to-market and increase product quality. Topics covered will include SW tools, workflow, advanced testing and deployment of code to embedded targets; followed by a working example of how MBD can be used for motor control algorithm design, verification, and implementation.
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Galvanic Isolation for Power Supply Applications -- This seminar discusses isolation and isolation technologies in terms of signal transmission methods and isolation materials, including optocouplers and digital isolators. Ii covers isolation usage, including current sensing, gate driver, and communication functions in ac-to-dc, motor control, hybrid electrical vehicles, PV, and other power supply applications.
Solving Isolation Challenges on Your Design -- This webinar reviews designs that require isolation to protect personnel and equipment from harsh electrical and mechanical environments. It discusses interface power requirements and approaches for achieving design objectives, and addresses performance tradeoffs and applicable safety certifications for interface components.
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Got my data over the isolation barrier! Now how do I get power to run it? - “What do you mean I have to isolate this thing?” If you have ever thought your design was done, only to find out you need to isolate data in addition to getting power to the isolated circuits, then this webcast is for you. In this session, we will discuss the pros and cons of the various methods of accomplishing this task while saving important board space, design time, and cost.
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