The LTC2389-18 is an all-in-one 18-bit SAR ADC that offers industry-leading sampling rates of up to 2.5Msps with no cycle latency. Operating from a single 5V supply, the LTC2389-18 supports three pin-configurable, fully-differential or pseudo-differential analog input ranges, easily interfacing multiple signal chain formats with a single device. The LTC2389-18 achieves outstanding AC performance of 99.8dB SNR with fully-differential inputs and 95.2dB SNR with pseudo-differential inputs at 18 bit of resolution. It also features excellent DC specifications of ±3 LSB INL and no missing codes. The device integrates a low drift 4.096V precision internal reference with ±20 ppm/ºC maximum temperature coefficient and an internal reference buffer, providing space savings for high-density designs. The flexible digital interface supports 2.5Msps throughput with the parallel interface and 1.9Msps throughput with the serial SPI interface at I/O voltages from 1.8 to 5V.