This converter utilizes sigma-delta techniques to offer 16-bit accuracy (0.0015% FSR) and no missing codes to 24-bits. It contains a two-channel programmable gain front end, a programmable low-pass digital filter and a bidirectional serial interface. One of the analog inputs and the reference input are differential and the part can accept inputs as low as 20 mV full-scale on this differential analog input. The second analog input contains an input attenuation circuit and can accept inputs up to ±10V. The part features a self-calibration mode, which removes internal offset and gain errors, a system calibration mode, which removes external circuit offset and gain errors, and a background calibration mode which automatically removes internal offset and gain errors. In addition, its flexible serial interface allows the AD7712 to connect directly to Digital Signal Processors (ADSP-2101, TMS320C25, etc.) and Microcontrollers (8XC51, 68HC11, etc.). Full data on the AD7712 is available in the AD7712 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.
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