The AD76871 is a 16-bit， charge redistribution， successive approximation， analog-to-digital converter （ADC） that operates from a single power supply， VDD， between 2.3 V to 5.5 V. It contains a low power， high speed， 16-bit sampling ADC with no missing codes， an internal conversion clock， and a versatile serial interface port. The device also contains a low noise， wide bandwidth， short aperture delay track-and-hold circuit. On the CNV rising edge， the AD7687 the samples the voltage difference between IN+ and IN? pins， which can range from ?VREF to +VREF. The reference voltage， VREF， is applied externally and can be set up to the supply voltage. The power consumption of the device scales linearly with throughput. The SPI-compatible serial interface also features the ability to daisy-chain several ADCs on a single 3-wire bus and provides an optional BUSY indicator by means of the SDI pin. It is compatible with 1.8 V， 2.5 V， 3 V， or 5 V logic using the separate supply VIO. The AD7687 comes in a 10-lead MSOP or a 10-lead LFCSP with operation specified from ?40°C to +85°C.