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 max @ 3␣ V Supplies
    Low-Pass Filter with Programmable Output Update
    16-Lead SOIC/DIP/TSSOP