The AD7712 is a complete analog front end for low frequencymeasurement applications. The device has two analog inputchannels and accepts either low level signals directly from a transduceror high level (±4 VREF) signals, and outputs a serialdigital word. It employs a sigma-delta conversion technique torealize up to 24 bits of no missing codes performance. The lowlevel input signal is applied to a proprietary programmable gainfront end based around an analog modulator. The high levelanalog input is attenuated before being applied to the samemodulator. The modulator output is processed by an on-chipdigital filter. The first notch of this digital filter can be programmedvia the on-chip control register, allowing adjustment of the filtercutoff and settling time.
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