The AD7823 is a high speed， low power， 8-bit A/D converter that operates from a single 2.7 V to 5.5 V supply. The part contains a 4 μs typ successive approximation A/D converter， inherent track-and-hold functionality （with a pseudo differential input） and a high speed serial interface that interfaces to most microcontrollers. The AD7823 is fully specified over a temperature range of –40°C to +125°C. By using a technique that samples the state of the CONVST （convert start） signal at the end of a conversion， the AD7823 may be used in an automatic power-down mode. When used in this mode， the AD7823 powers down automatically at the end of a conversion and “wakes up” at the start of a new conversion. This feature significantly reduces the power consumption of the part at lower throughput rates. The AD7823 can also operate in a high speed mode where the part is not powered down between conversions. In this high speed mode of operation， the conversion time of the AD7823 is 4 μs typ. The maximum throughput rate is dependent on the speed of the serial interface of the microcontroller. The part is available in a small， 8-lead 0.3“ wide， plastic dual-inline package （mini-DIP）; in an 8-lead， small outline IC （SOIC）; and in an 8-lead microSOIC package.