GENERAL DESCRIPTION
The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a Σ-Δ conversion technique to realize up to 16 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and output update rate.
   
FEATURES
    Charge-balancing ADC
        16-bits no missing codes
        0.0015% nonlinearity
    Programmable gain front end
        Gains of 1, 2, 32 and 128
        Differential input capability
    Three-wire serial interface
    SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible
    Ability to buffer the analog input
    3 V (AD7715-3) or 5 V (AD7715-5) operation
    Low supply current: 450 µA maximum @ 3 V supplies
    Low-pass filter with programmable output update
    16-lead SOIC/PDIP/TSSOP