The AD7892 is a high speed， low power， 12-bit A/D converter that operates from a single +5 V supply. The part contains a 1.47 μs successive approximation ADC， an on-chip track/hold amplifier， an internal +2.5 V reference and on-chip versatile interface structures that allow both serial and parallel connection to a microprocessor. The part accepts an analog input range of ±10 V or ±5 V （AD7892-1）， 0 V to +2.5 V （AD7892-2） and ±2.5 V （AD7892-3）。 Overvoltage protection on the analog inputs for the AD7892-1 and AD7892-3 allows the input voltage to go to ±17 V or ±7 V respectively without damaging the ports. The AD7892 offers a choice of two data output formats： a single， parallel， 12-bit word or serial data. Fast bus access times and standard control inputs ensure easy parallel interface to microprocessors and digital signal processors. A high speed serial interface allows direct connection to the serial ports of microcontrollers and digital signal processors. In addition to the traditional dc accuracy specifications such as linearity， full-scale and offset errors， the part is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.