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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

  • Data acquisition solution fully characterized over 0°C to 70°C
  • Guaranteed 20-bit no missing codes
  • INL: ±2 ppm, DNL: ±0.25 ppm
  • Throughput: 1.8 MSPS
  • Offset error drift: ±3.5 ppm/°C; gain error drift: ±6 ppm/°C
  • SNR: 98 dB at G = 1, 92 dB at G = 10, fIN = 1 kHz
  • THD: −120 dB at G = 1, −116 dB at G = 10, fIN = 1 kHz
  • Oversampled dynamic range: 102 dB at 900 kSPS, OSR = 2
  • Software programmable bipolar input ranges (±1 V to ±10 V)
    • Allows single-ended and differential signals
  • CMRR: 92 dB typical
  • GΩ input impedance allows direct interface with sensors
  • Ease of use features reduce system power and complexity
  • ADC Input overvoltage clamp protection sinks up to 50 mA
  • On-board 5 V reference and buffer
  • First conversion accurate, no latency/pipeline delay
  • Fast conversion time allows low SPI clock rates
  • SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface

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、精密SAR、差分ADC

AD4020BCPZ-RL7

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购买评估板 所示报价为单片价格
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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