GENERAL DESCRIPTION
The AD7175-8 is a low noise, fast settling, multiplexed, 8-/16-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.

FEATURES
   Fast and flexible output rate: 5 SPS to 250 kSPS
   Channel scan data rate of 50 kSPS/channel (20 µs settling)
   Performance specifications
      17.2 noise free bits at 250 kSPS
      20.2 noise free bits at 2.5 kSPS
      24 noise free bits at 20 SPS
      INL: ±1 ppm of FSR
   85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling
   User configurable input channels
      8 fully differential channels or 16 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 − AVSS = 5 V, AVDD2 = IOVDD = 2 V to
      5 V (nominal)
      Split supply with AVDD1/AVSS at ±2.5 V
   ADC current: 8.4 mA
   Temperature range: −40°C to +105°C
   3- or 4-wire serial digital interface (Schmitt trigger on SCLK)
      Serial port interface (SPI), QSPI, MICROWIRE, and DSP
      compatible
  
APPLICATIONS
   Process control: PLC/DCS modules
      Temperature and pressure measurement
   Medical and scientific multichannel instrumentation
   Chromatography