Analog Devices Inc. AD7173-8 Low-Power Sigma-Delta ADCs

Analog Devices AD7173-8 Low-Power Sigma-Delta ADCs are fast settling, highly accurate, 8-/16-channel, multiplexed ADCs designed for low bandwidth input signals with integrated input buffers. These ADCs feature an integrated precision, 2.5V, 3.5ppm/°C low drift, band gap reference, and an integrated oscillator. The design also includes integrated diagnostic features such as CRC, temperature sensor, register checksum, burnout currents, crosspoint multiplexer, and GPIOs/GPOs. Designers can choose eight different setups for the Analog Devices AD7173-8 ADCs. The setups are configurable by options such as output data rate, buffer, digital filter mode, offset/gain error correction, and reference selection. The ADCs' Sinc5 + sinc1 filter maximizes the channel scan rate. AD7173-8's sinc3 filter maximizes the resolution and enhanced 50Hz/60Hz rejection. These ADCs include four selectable options to maximize rejection.


  • Low power, 8-/16-channel, highly integrated multiplexed analog-to-digital converter (ADC)
  • Integration
    • Precision analog input buffers and reference input buffers
    • 2.5V precision reference (3.5ppm/°C)
    • Crosspoint multiplexer(enable system diagnostic)
    • 8 full differential or 16 single-ended channels
    • Clock oscillator
    • GPIO and GPO pins with automatic external mux control
  • 1.25SPS to 31.25kSPS output rate
  • 6.21kSPS/channel (161μs settling) channel scan data rate
  • -40°C to +105°C temperature range
  • 40-lead 6mm × 6mm LFCSP package
  • 1.4mA current rating
  • Performance specifications
    • 17.5 noise-free bits at 31.25kSPS
    • 24 noise-free bits at 1.25SPS
    • INL: ±3ppm/FSR
  • 85dB rejection of 50Hz and 60Hz with 50ms settling
  • Operates with either 3.3V or 5V supply
    • Single supply
      • 3.3V or 5V AVDD1, 2V to 5V AVDD2, and 2V to 5V IOVDD
    • Optional split supply
      • AVDD1 and AVSS ±2.5V or AVDD1 and AVSS ±1.65V
  • 3-/4-wire serial digital interface (Schmitt trigger on SCLK)
    • CRC error checking
    • SPI, QSPI, MICROWIRE, and DSP compatible


  • Process Control
    • PLC/DCS modules
  • Voltage, current, temperature, and pressure measurement
  • Flow meters
  • Medical and scientific multi-channel instrumentation
  • Seismic instrumentation
  • Chemical Analysis Instrumentation
    • chromatography

Functional Block Diagram

Block Diagram - Analog Devices Inc. AD7173-8 Low-Power Sigma-Delta ADCs
Publicado: 2017-01-16 | Atualizado: 2022-03-11