概览

设计资源

评估硬件

产品型号带"Z"表示符合RoHS标准。评估此电路需要下列选中的电路板

  • EV-AD4020-REF-DGNZ ($199.00) 20-bit High Accuracy ADC Reference Design
  • EVAL-SDP-CH1Z ($199.00) Evaluation Control Board
查询库存和在线购买

优势和特点

  • 数据采集解决方案在0°C70°C范围内经过完全表征
  • 保证20位无失码
  • INL±2 ppmDNL±0.25 ppm
  • 吞吐速率:1.8 MSPS
  • 失调误差漂移:±3.5 ppm/°C;增益误差漂移:±6 ppm/°C
  • SNR98 dBG = 1时),92 dBG = 10时),fIN = 1 kHz
  • THD-120 dBG = 1时),-116 dBG = 10时),fIN = 1 kHz
  • 过采样动态范围:102 dB (900 kSPS)OSR = 2
  • 软件可编程双极输入范围(±1 V±10 V
    • 允许单端和差分信号
  • CMRR92 dB(典型值)
  • 输入阻抗允许与传感器直接接口
  • 易用特性可降低系统功耗和复杂性
  • 高达50 mAADC输入过压箝位保护吸电流
  • 片内5 V基准电压和缓冲
  • 第一转换精度,无延迟/流水线延迟
  • 快速转换时间支持低SPI时钟速率
  • SPI/QSPI/MICROWIRE/DSP兼容串行接口

电路描述

System designers developing data acquisition signal chains typically require high input impedance to allow direct interface with a variety of sensors, which could have varying common-mode voltages and unipolar or bipolar single-ended or differential input signals present. The majority of the instrumentation and programmable gain instrumentation amplifiers (PGIAs) are traditionally single-ended output that cannot directly drive a fully differential, high resolution, successive approximation register (SAR) analog-to-digital converter (ADC), and require at least one signal conditioning/driver stage. However, this approach may not always facilitate stringent high accuracy performance, namely, linearity, drift, and speed at desired input levels.

This reference design incorporates the unique discrete PGIA architecture of the Analog Devices, Inc., 20-bit, 1.8 MSPS SAR ADC AD4020, a 5 V reference, and a reference buffer with on-board power supply circuitry. This solution provides a fully characterized, validated design optimized for high precision, offering unprecedented linearity (±2 ppm typical INL), low offset/gain error drift, and trackable noise and distortion (beyond −115 dB) performance at full speed for all gain options over the 0°C to 70°C temperature range. The differential output PGIA uses off-the-shelf discrete components for digitally programmable gains that have GΩ input impedance, over 92 dB common-mode rejection ratio, low output noise, and low distortion, making it suitable for directly interfacing with various sensor types and driving a high throughput, high resolution SAR ADC without compromising performance.


CONTACT ADI: For more information on the AD4020 based High Accuracy Data Acquisition Solution contact Referencedesigns@analog.com


样片申请及购买

样片

产品

描述

可提供样片的
产品型号

AD4020

20位、1.8 MSPS、轻松驱动、差分SAR ADC

AD4020BCPZ-RL7

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以上块评估板您均可以已通过 analog.com 获取。如超过单片的数量,请通过代理商进行购买。
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