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Circuit Function and Benefits
This circuit is a weigh scale system that uses the AD7191. The AD7191 is a pin programmable, low noise, low drift, 24-bit Σ-Δ converter that includes a PGA and uses an internal clock. Therefore, the device simplifies the weigh scale design because most of the system building blocks are included on chip. The device has four output data rates and four gain settings that are selected using dedicated pins. This simplifies the interface to the ADC.
| 优化目标: | 高精度 |
| 应用: | 工业与仪器仪表; 仪器仪表 |
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.
| 应用: | 仪器仪表 |
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.
| 电路类型: | 接口 |
| 优化目标: | 高速度; 低噪声与低失真 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
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.
| 优化目标: | 高精度 |
| 应用: | 工业与仪器仪表 |
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.
| 电路类型: | 时钟; DAC电路; 滤波; 开关 |
| 优化目标: | 高精度; 高分辨率; 高速度 |
| 应用: | 通信; 医疗 |
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.
| 电路类型: | ADC电路/驱动器 |
| 优化目标: | 高性能; 高分辨率 |
| 应用: | 仪器仪表; 过程控制 |
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.
| 优化目标: | 高分辨率; 低噪声与低失真 |
| 应用: | 工业与仪器仪表; 仪器仪表 |
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.
| 优化目标: | 高分辨率; 低噪声与低失真 |
| 应用: | 工业与仪器仪表; 仪器仪表 |
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.
| 优化目标: | 高精度 |
| 应用: | 仪器仪表 |
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.
| 电路类型: | ADC电路/驱动器; 滤波; 接口; RF/RF驱动器 |
| 优化目标: | 低噪声与低失真 |
| 应用: | 通信 |
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.
| 电路类型: | ADC电路/驱动器; 电源; 基准电压源 |
| 优化目标: | 高精度; 高分辨率; 低噪声与低失真 |
| 应用: | 仪器仪表; 医疗 |
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.
| 电路类型: | DAC电路 |
| 优化目标: | 低噪声与低失真 |
| 应用: | 通信; 仪器仪表 |
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.
| 电路类型: | DAC电路 |
| 应用: | 通信; 工业与仪器仪表; 过程控制 |
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.
| 电路类型: | DAC电路; 多通道 |
| 优化目标: | 高精度; 高分辨率 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
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.
| 应用: | 过程控制 |
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.
| 电路类型: | 接口 |
| 优化目标: | 高性能; 高分辨率; 低噪声与低失真 |
| 应用: | 工业与仪器仪表; 仪器仪表 |
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.
| 电路类型: | 接口 |
| 优化目标: | 高精度; 高分辨率 |
| 应用: | 汽车; 通信; 运动控制; 过程控制 |
| 优化目标: | 低噪声与低失真 |
| 应用: | 仪器仪表; 医疗; 电能计量; 过程控制 |
| 优化目标: | 低噪声与低失真 |
| 应用: | 仪器仪表; 过程控制 |
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.
| 电路类型: | DAC电路 |
| 优化目标: | 低噪声与低失真 |
| 应用: | 仪器仪表; 过程控制 |
| 优化目标: | 高精度; 高分辨率; 低噪声与低失真; 温度稳定性 |
| 应用: | 仪器仪表; 医疗; 过程控制 |
| 电路类型: | ADC电路/驱动器; 滤波; 接口; 电源 |
| 优化目标: | 高精度; 高分辨率; 低噪声与低失真; 温度稳定性 |
| 应用: | 楼宇控制; 仪器仪表; 电能计量; 过程控制 |
AD5422
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.
| 电路类型: | ADC电路/驱动器; 开关; 基准电压源 |
| 优化目标: | 高精度 |
| 电路类型: | ADC电路/驱动器; 时钟 |
| 优化目标: | 高精度; 高分辨率; 低噪声与低失真 |
| 应用: | 通信 |
AD5420
AD5722R
AD5412
电路功能与优势
本电路由一个数模视频转换器与一个低成本、低功耗、全集成式重构视频滤波器配合组成。虽然ADV7393 等许多视频编码器(视频DAC)可以直接驱动视频负载,但在视频编码器的输出端使用视频驱动器往往非常有利,可以节省功耗,实现线路驱动,并提供更好的电路保护。该视频驱动器通常配置为有源滤波器,也称为重构滤波器或抗镜像滤波器。重构滤波器的作用有两方面:阻隔数字化处理过程中引入视频信号的较高频率部分(高于奈奎斯特频率),此外还提供增益,以驱动与视频显示器相连的75 Ω外部电缆。对于交流耦合输出应用,ADA4430-1集成了信号振幅增益(SAG)校正网络。后部端接电缆的150 Ω负载电阻与输出耦合电容构成一个高通滤波器,利用SAG校正可为该高通滤波器提供低频补偿。SAG校正可以降低传统的大交流耦合电容(330 μF)要求,而用较小的47 μF和22 μF电容取而代之。
| 电路类型: | 滤波 |
| 优化目标: | 高分辨率; 高速度 |
| 应用: | 音/视频; 汽车 |
电路功能与优势
本电路提供I/Q调制数据的上变频以及RF/IF载波电平的自动功率控制。输出功率由一个12位DAC设置,可在最高30 dB的线性dB范围内精确设置。在−40°C至+85°C范围内,通常温度稳定性达到±0.2 dB。图1显示输出频率为350 MHz时的工作电路图;不过,本电路将在50 MHz至2.2 GHz频率范围内工作。
| 电路类型: | RF/RF驱动器 |
| 优化目标: | 高性能; 高精度; 高速度; 温度稳定性 |
| 应用: | 通信 |
电路功能与优势
在将具有宽动态范围的模拟信号转换为数字格式,而ADC分辨率不足以捕捉全部有用信息时,可变增益放大器(VGA)可以发挥重要作用。例如,具有2 V峰峰值输入范围的10位转换器的LSB大小为2 ÷ 1024,即稍低于2 mV。VGA放大幅度小于最低分辨率的输入信号,并衰减大信号,以免ADC饱和。信号强度在数微伏至数伏范围内的超声接收机,以及几乎所有接收机都会用到的中频(IF)放大器,就是这类应用的例子。对于直流或低频模拟信号,分辨率最高达24位的Σ-Δ型ADC经济实惠、款式多样,但采样频率通常限制在数百kHz。现有的先进ADC的分辨率会随着采样频率的提高而降低,这使得利用标准ADC对高频、低振幅信号进行精确数字化处理极其困难。可变增益放大器可以方便地解决这一问题,图1所示为VGA驱动ADC的典型应用。
| 电路类型: | ADC电路/驱动器 |
| 优化目标: | 高速度 |
| 应用: | 通信; 工业与仪器仪表; 医疗 |
| 电路类型: | ADC电路/驱动器; 接口; 电源 |
| 优化目标: | 高精度; 低噪声与低失真 |
| 应用: | 通信; 运动控制 |
电路功能与优势
本电路采用双通道、14位、串行输入、单极性/双极性电压输出DAC AD5732BREZ及2.5 V精密基准电压源REF192ESZ,可提供单极性和双极性数据转换。该14位DAC电路所需的其它外部器件只有电源引脚和基准输入上的去耦电容,从而可以节省成本和电路板空间。本电路非常适合闭环伺服控制应用。
| 电路类型: | DAC电路 |
| 优化目标: | 高分辨率; 温度稳定性 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
电路功能与优势
本电路采用双通道、16位、串行输入、单极性/双极性电压输出DAC AD5752BREZ及2.5 V精密基准电压源REF192ESZ,可提供单极性和双极性数据转换。该16位DAC电路所需的其它外部器件只有电源引脚和基准输入上的去耦电容,从而可以节省成本和电路板空间。本电路非常适合闭环伺服控制应用。
| 电路类型: | DAC电路 |
| 优化目标: | 高分辨率; 温度稳定性 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
电路功能与优势
本电路采用双通道、12位、串行输入、单极性/双极性电压输出DAC AD5722BREZ及2.5 V精密基准电压源REF192ESZ,可提供单极性和双极性数据转换。该12位DAC电路所需的其它外部器件只有电源引脚和基准输入上的去耦电容,从而可以节省成本和电路板空间。本电路非常适合闭环伺服控制应用。
| 电路类型: | DAC电路 |
| 优化目标: | 温度稳定性 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
| 电路类型: | DAC电路 |
| 优化目标: | 高分辨率; 温度稳定性 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
AD5752R
| 电路类型: | DAC电路 |
| 优化目标: | 高分辨率; 温度稳定性 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
AD5732R
AD5732R
电路功能与优势
本电路采用四通道、12位、串行输入、单极性/双极性电压输出DAC AD5724BREZ及2.5 V精密基准电压源 REF192ESZ ,可提供单极性和双极性数据转换。该12位DAC电路所需的其它外部器件只有电源引脚和基准输入上的去耦电容,从而可以节省成本和电路板空间。本电路非常适合闭环伺服控制应用。
| 电路类型: | 多通道 |
| 优化目标: | 温度稳定性 |
| 应用: | 仪器仪表; 过程控制 |
电路功能与优势
本电路采用四通道、14位、串行输入、单极性/双极性电压输出DAC AD5734BREZ及2.5 V精密基准电压源 REF192ESZ ,可提供单极性和双极性数据转换。该14位DAC电路所需的其它外部器件只有电源引脚和基准输入上的去耦电容,从而可以节省成本和电路板空间。本电路非常适合闭环伺服控制应用。
| 电路类型: | 多通道 |
| 优化目标: | 高分辨率; 温度稳定性 |
| 应用: | 仪器仪表; 过程控制 |
电路功能与优势
本电路采用四通道、16位、串行输入、单极性/双极性电压输出DAC AD5754BREZ及2.5 V精密基准电压源 REF192ESZ ,可提供单极性和双极性数据转换。该16位DAC电路所需的附加外部器件只有电源引脚和基准输入上的去耦电容,从而可以节省成本和电路板空间。本电路非常适合闭环伺服控制应用。
| 电路类型: | 多通道 |
| 优化目标: | 高分辨率 |
| 应用: | 仪器仪表; 过程控制 |
AD5754
AD5724R
AD5754R
AD5410
电路功能与优势
无论是有线通信还是无线通信,发射机的整体性能均与放大器的输出功率密切相关。如果信号很弱,低信噪比(SNR)将会加大比特差错率(BER)或调制误差率(MER)。如果信号太强,失真也会引起同样的问题。本电路采用ADL5331 VGA、功率检波器AD8319 和低功耗nanoDACAD5621 ,可获得12位精度的输出功率控制。AD8319具有非常高的温度稳定性,可补偿VGA在整个温度范围内的任何增益变化,因此可在较宽的温度范围内实现非常精确的功率控制。由于AD8319的控制输入VSET和输出VOUT与RF输入具有V/dB比例关系,并且AD5621 nanoDAC具有线性传递函数,因此所得到的输出功率控制将与DAC输入码之间呈线性dB关系。
| 电路类型: | 电源; RF/RF驱动器 |
| 应用: | 通信 |
| 电路类型: | DAC电路 |
| 优化目标: | 高分辨率; 隔离 |
| 应用: | 工业与仪器仪表; 仪器仪表; 过程控制 |
| 电路类型: | DAC电路; 多通道 |
| 优化目标: | 高精度; 高分辨率; 温度稳定性 |
| 应用: | 楼宇控制; 工业与仪器仪表; 仪器仪表; 医疗; 运动控制; 过程控制 |
| 电路类型: | ADC电路/驱动器; RF/RF驱动器 |
| 优化目标: | 高分辨率; 高速度 |
| 应用: | 通信; 医疗 |
| 电路类型: | DAC电路; 多通道 |
| 优化目标: | 高精度; 高分辨率; 温度稳定性 |
| 应用: | 楼宇控制; 工业与仪器仪表; 仪器仪表; 医疗; 运动控制; 过程控制 |
| 电路类型: | 多通道 |
| 优化目标: | 高性能; 高精度; 温度稳定性 |
| 应用: | 仪器仪表; 过程控制 |

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