AD7894 is a fast, 14-bit, 5 V supply, 5 µs conversion time analog-to-digital converter (ADC) from AD, housed in a small 8-lead SOIC. The part contains a 5 µs successive approximation A/D converter, an on-chip track/hold amplifier, an on-chip clock and a high speed serial interface. Output data from the AD7894 is provided via a high speed, serial interface port. This two-wire serial interface has a serial clock input, a serial data output and a busy output. The AD7894 is available in three versions with different input ranges. The AD7894-10 accepts input signals ranging from -10 V to +10 V, the AD7894-3 accepts input signals ranging from -2.5 V to +2.5 V and the AD7894-2 accepts input signals ranging from 0 V to +2.5 V.