The AD7709 is a complete analog front end for low frequencymeasurement applications. It contains a 16-bit
- ADC, selectablereference inputs, three switchable matched excitation currentsources, low-side power switches, and a digital I/O port. The16-bit channel with PGA accepts fully differential, unipolar,and bipolar input signal ranges from 1.024  REFIN/128 to1.024  REFIN. It can be configured as two fully differentialinput channels or four pseudo-differential input channels. Signalscan be converted directly from a transducer without the need forsignal conditioning.