The AD7716 is a signal processing block for data acquisitionsystems. It is capable of processing four channels with bandwidthsof up to 584 Hz. Resolution is 22 bits and the usabledynamic range varies from 111 dB with an input bandwidth of36.5 Hz to 99 dB with an input bandwidth of 584 Hz.The device consists of four separate A/D converter channels thatare implemented using sigma-delta technology. Sigma-deltaADCs include on-chip digital filtering and, thus, the systemfiltering requirements are eased.Three address pins program the device address. This allows adata acquisition system with up to 32 channels to be set up in asimple fashion. The output word from the device contains 32bits of data. One bit is determined by the state of the DIN1 inputand may be used, for example, in an ECG system with anexternal pacemaker detect circuit to indicate that the outputword is invalid because of the presence of a pacemaker pulse.
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