AD7173-8 Low-Power Multiplexed ADC

AD7173-8 Low-Power Multiplexed ADC

Analog Devices' AD7173-8 is a fast-settling, highly-accurate, low-power, 8-/16-channel, multiplexed ADC for low-bandwidth input signals with integrated input buffers. It features integrated precision, 2.5 V, low-drift (3.5 ppm/°C), band gap reference and integrated oscillator. Eight flexible setups with configurability for output data rate, digital filter mode, offset/gain error correction, reference selection, and buffer enables.

Sinc5 + sinc1 filter maximizes channel scan rate, and sinc3 filter maximizes resolution and enhanced 50 Hz/60 Hz rejection, with four selectable options to maximize rejection. Integrated diagnostic features, including CRC, register checksum, temperature sensor, crosspoint multiplexer, burnout currents, and GPIOs/GPOs.

  • Low power, 8-/16-channel, highly-integrated multiplexed analog-to-digital converter (ADC)
  • Integration:
    • Precision analog input buffers and reference input buffers
    • 2.5 V precision reference
    • (3.5 ppm/°C)
    • Cross-point multiplexer (enable system diagnostic)
  • 8-full-differential or 16 single-ended channels
  • GPIO and GPO pins with automatic external mux control
  • Fast and flexible output rate:
    • 1.25 SPS to 31.25 kSPS
  • Channel scan data rate: 6.21 kSPS/channel (161 μs settling)
  • Performance specifications:
    • 17.5 noise-free bits at 31.25 kSPS
    • 23 noise-free bits at 1.25 SPS
    • INL: ±3 ppm/FSR
  • 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
  • Clock oscillator
  • Process control: PLC/DCS modules
  • Voltage, current, temperature, and pressure measurement
  • Flow meters
  • Medical and scientific multichannel instrumentation
  • Seismic instrumentation
  • Chemical analysis instrumentation: chromatography

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