The AD7988-1/AD7988-51 are 16-bit， successive approximation， analog-to-digital converters （ADC） that operate from a single power supply， VDD. The AD7988-1 offers a 100 kSPS throughput， and the AD7988-5 offers a 500 kSPS throughput. They are low power， 16-bit sampling ADCs with a versatile serial interface port. On the CNV rising edge， they sample an analog input， IN+， between 0 V to VREF with respect to a ground sense， IN?。 The reference voltage， REF， is applied externally and can be set independent of the supply voltage， VDD. The SPI-compatible serial interface also features the ability to daisy-chain several ADCs on a single 3-wire bus using the SDI input. It is compatible with 1.8 V， 2.5 V， 3 V， or 5 V logic using the separate supply， VIO. The AD7988-1/AD7988-5 generics are housed in a 10-lead MSOP or a 10-lead LFCSP with operation specified from ?40°C to +125°C.