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Analog Devices Precision SAR ADCs | New Product Brief

January 17, 2020 by Mouser Electronics

This New Product Brief (NPB) is part of a video series highlighting the features, applications, and technical specs of newly-released products.

Analog Devices Precision SAR ADCs

Analog Devices’ AD4020 family of ADCs are low-power, low-noise ADCs reducing signal chain complexity and power consumption while enabling higher channel density in precision applications. The AD4020 is a 20-bit, 1.8MSPS ADC delivering ±3.1ppm integral non-linearity and a 100.5dB signal-to-noise ratio. It also consumes just 15mW at 1.8MSPS, and power consumption drops to 83µW at 10kSPS. 

The ADCs include a number of features further simplifying the signal chain and reducing system power consumption, including a high-z mode enabling driving inputs with low-power precision amplifiers, a 350ns conversion time allowing for slower clocking of the serial interface, and daisy-chaining multiple ADCs. 

AD4020 ADCs can operate from a single 1.8V supply, but offer separate voltage rails for flexibility.

  • Resolution: 20-bit, guaranteed no missing codes
  • Throughput: up to 1.8MSPS
  • Low noise:
    • INL: ±3.1ppm maximum
    • SNR: 100.5dB at 1kHz
    • THD: -123dB at 1kHz
  • Low power:
    • 1.8MSPS: 15mW 
    • 10kSPS: 83µW
  • Ease-of-use features reduce system power and complexity
    • High-z mode for use with low-power precision amplifiers
    • Short acquisition time enables slower clocking of serial interface
  • VDD, VREF, VIO rails provide flexibility
    • Single 1.8V supply operation
    • VREF: 2.4V to 5.1V
    • VIO: 1.71 V to 5.5 V

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