AD7175-2/AD7172-2 Analog-to-Digital Converters

AD7175-2/AD7172-2 Analog-to-Digital Converters

Analog Devices' AD7175-2 is a low noise, fast settling, multiplexed, 2-/4-channel (fully/pseudo differential) Σ-Δ analog-to-digital converter (ADC) for low bandwidth inputs. It has a maximum channel scan rate of 50 kSPS (20 μs) for fully-settled data. The output data rates range from 5 SPS to 250 kSPS.

Analog Devices' AD7172-2 is a low noise, low power, multiplexed, 2-/4-channel (fully/pseudo differential) Σ-Δ analog-to-digital converter (ADC) for low bandwidth inputs. It has a maximum channel scan rate of 6.21 kSPS (161 μs) for fully-settled data. The output data rates range from 1.25 SPS to 31.25 kSPS.

The AD7175-2 and AD7172-2 each integrate key analog and digital signal conditioning blocks to allow users to configure an individual setup for each analog input channel in use. Each feature can be user selected on a per-channel basis. Integrated true rail-to-rail buffers on the analog inputs and external reference inputs provide easy to drive high-impedance inputs. The precision 2.5 V low-drift (2 ppm/°C) band gap internal reference (with output reference buffer) adds embedded functionality to reduce external component count.

The digital filter allows simultaneous 50 Hz/60 Hz rejection at 27.27 SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application. The ADC automatically switches through each selected channel. Further digital processing functions include offset and gain calibration registers, configurable on a per-channel basis.

AD7175-2 Features AD7172-2 Features
  • Fast and flexible output rate: 5 SKS to 250 kSPS
  • Channel scan data rate of 50 kSPS/channel (20 μs settling)
  • Performance Specifications
    • 17.2 noise free bits at 250 kSPS
    • 20 noise free bits at 2.5 kSPS
    • 24 noise free bits at 20 SPS
    • INL: ±1 ppm of FSR
  • 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
  • User configurable input channels
    • 2 fully-differential channels or 4 single-ended channels
    • Crosspoint multiplexer
  • On-chip 2.5 V reference (±2 ppm/°C drift)
  • True rail-to-rail analog and reference input buffers
  • Internal or external clock
  • Power supply: AVDD1 = 5 V, AVDD2 = IOVDD = 2 V to 5 V
    • Split supply with AVDD1/AVSS at ±2.5 V
  • ADC current: 8.4 mA
  • Temperature range: -40°C to +105°C
  • 24-lead TSSOP package
  • Fast and flexible output rate: 1.25 SKS to 31.25 kSPS
  • Channel scan data rate of 6.21 kSPS/channel (161 μs settling)
  • Performance Specifications
    • 17.2 noise free bits at 31.25 kSPS
    • 24 noise free bits at 5 SPS
    • INL: ±2 ppm of FSR
  • 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
  • User configurable input channels
    • 2 fully-differential channels or 4 single-ended channels
    • Crosspoint multiplexer
  • On-chip 2.5 V reference (±2 ppm/°C drift)
  • True rail-to-rail analog and reference input buffers
  • Internal or external clock
  • Power supply: AVDD1 = 3.0 V to 5 V, AVDD2 = IOVDD = 2 V to 5. V
    • Split supply with AVDD1/ and AVSS at ±2.5 V or ±1.65 V
  • ADC current: 1.5 mA
  • Temperature range: -40°C to +105°C
  • 24-lead TSSOP package

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