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The AD7710 is a complete analog front end for low frequencymeasurement applicaTIons. The device accepts low level signalsdirectly from a strain gage or transducer and outputs a serialdigital word. It employs a sigma-delta conversion technique torealize up to 24 bits of no missing codes performance. The inpsignal is applied to a proprietary programmable gain front endbased around an analog modulator. The modulator output isprocessed by an on-chip digital filter. The first notch of thisdigital filter can be programmed via the on-chip control registeallowing adjustment of the filter cutoff and settling TIme.The part features two differenTIal analog inputs and a differen-TIal reference input. Normally, one of the channels will be usedas the main channel with the second channel used as an auxil-iary input to periodically measure a second voltage. It can beoperated from a single supply (by tying the VSS pin to AGND)provided that the input signals on the analog inputs are morepositive than –30 mV. By taking the VSS pin negative, the partcan convert signals down to –VREF on its inputs. The AD7710thus performs all signal conditioning and conversion for a singlor dual channel system.The AD7710 is ideal for use in smart, microcontroller basedsystems. Input channel selection, gain settings and signal polarity can be configured in software using the bidirectional serialport. The AD7710 contains self-calibration, system calibrationand background calibration options and also allows the user toread and write the on-chip calibration registers.
