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Analog Devices Inc. AD7172-2 / AD7172-4 24-Bit Sigma-Delta ADC

Analog Devices AD7172-2 and AD7172-4 24-Bit Sigma-Delta ADC is an intelligent, low noise, low power, multiplexed, sigma-delta analog-to-digital converter with 2- or 4-channel (fully differential/single-ended) inputs for low bandwidth signals. ADI AD7172-2 has a maximum channel scan rate of 6.21kSPS (161μs) for fully settled data. The output data rates range from 1.25SPS to 31.25kSPS. AD7172-2 integrates key analog and digital signal conditioning blocks to allow users to configure an individual setup for each analog input channel in use via SPI. Integrated true rail-to-rail buffers on the analog inputs and external reference inputs provide easy-to-drive high impedance inputs.

The precision 2.5V low drift (f2 ppm/°C) bandgap internal reference (with an output reference buffer) adds embedded functionality to reduce external component count. The digital filter allows simultaneous 50Hz/60Hz rejection at a 27.27SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application, with further digital processing functions such as offset and gain calibration registers, which are also configurable on a per-channel basis. General-purpose inputs/outputs (GPIOs) can control external multiplexers synchronous to ADC conversion timing. The specified operating temperature range is −40°C to +105°C. AD7172-2 is in a 24-lead TSSOP package.

Features

  • Fast and flexible output rate: 1.25SPS to 31.25kSPS
  • Channel scan data rate of 6.21kSPS/channel (161μs settling)
  • Performance specifications
    • 17.2 noise-free bits at 31.25kSPS
    • 24 noise-free bits at 5SPS
    • INL: ±2ppm of FSR
  • 85dB rejection of 50Hz and 60Hz with 50ms settling
  • User-configurable input channels
    • 2 fully-differential channels or 4 single-ended channels
    • Crosspoint multiplexer
  • On-chip 2.5V reference (±2ppm/°C drift)
  • True rail-to-rail analog and reference input buffers
  • Temperature range: −40°C to +105°C

Applications

  • Process control
    • PLC/DCS modules
    • Temperature and pressure measurement
    • Medical and scientific multichannel instrumentation
  • Chromatography

Block Diagram

Block Diagram - Analog Devices Inc. AD7172-2 / AD7172-4 24-Bit Sigma-Delta ADC

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Published: 2015-01-13 | Updated: 2025-02-07