AD7896

The AD7896 is a fast, 12-bit ADC that operates from a single 2.7 V to 5.5 V supply and is housed in small 8-lead PDIP and 8-lead SOIC packages. The part contains an 8 µs successive approximation ADC, an on-chip track-and-hold amplifier, an on-chip clock, and a high speed serial interface.

Output data from the AD7896 is provided via a high speed, serial interface port. This 2-wire serial interface has a serial clock input and a serial data output with the external serial clock accessing the serial data from the part.

In addition to the traditional dc accuracy specifications, such as linearity, full-scale, and offset errors, the AD7896 is also specified for dynamic performance parameters, including harmonic distortion and signal-to-noise ratio.

The part accepts an analog input range of 0 V to V_DD and operates from a single 2.7 V to 5.5 V supply, consuming only 9 mW typical. The V_DD input is also used as the reference for the part so that no external reference is required.

The AD7896 features a high sampling rate mode and, for low power applications, a proprietary automatic power down mode where the part automatically goes into power down once con-version is complete and "wakes up" before the next conversion cycle.

The part is available in a small, 8-lead, 0.3'' wide, plastic or hermetic dual-in-line package (PDIP) and in an 8-lead, small outline IC (SOIC).

PRODUCT HIGHLIGHTS

1. Complete, 12-bit ADC in an 8-Lead Package.
   The AD7896 contains an 8 µs ADC, a track-and-hold amplifier, control logic, and a high speed serial interface, all in an 8-lead PDIP. The VDD input is used as the reference for the part, so no external reference is needed. This offers considerable space saving over alternative solutions.
2. Low Power, Single-Supply Operation.
   The AD7896 operates from a single 2.7 V to 5.5 V supply and consumes only 9 mW typical. The automatic powerdown mode, where the part goes into power down once conversion is complete and “wakes up” before the next conversion cycle, makes the AD7896 ideal for battery-powered or portable applications.
3. High Speed Serial Interface.
   The part provides high speed serial data and serial clock lines allowing for an easy, 2-wire serial interface arrangement.