GENERAL DESCRIPTION
The AD7176-2 is a fast settling, highly accurate, high resolution, multiplexed Σ-Δ analog-to-digital converter (ADC) for low bandwidth input signals. Its inputs can be configured as two fully differential or four pseudo differential inputs via the integrated crosspoint multiplexer. An integrated precision, 2.5 V, low drift (2 ppm/°C), band gap internal reference (with an output reference buffer) adds functionality and reduces the external component count.

FEATURES
    Fast and flexible output rate—5 SPS to 250 kSPS
    Fast settling time—20 µs
    Channel scan data rate of 50 kSPS/channel
    Performance specifications
        17 noise free bits at 250 kSPS
        20 noise free bits at 2.5 kSPS
        22 noise free bits at 5 SPS
        INL ±2.5 ppm of FSR
    85 dB rejection of 50 Hz and 60 Hz with 50 ms settling
    User-configurable input channels
        2 fully differential or 4 pseudo differential
        Crosspoint multiplexer
    On-chip 2.5 V reference (drift 2 ppm/°C)
    Internal oscillator, external crystal, or external clock
    Power supply
        Single supply: 5 V AVDD1, 2 V to 5 V AVDD2 and IOVDD
        Optional split supply: AVDD1 and AVSS ± 2.5 V
    Current: 7.8 mA
    Temperature range: −40°C to +105°C
    3- or 4-wire serial digital interface (Schmitt trigger on SCLK)
        CRC error checking
        SPI, QSPI, MICROWIRE, and DSP compatible

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