AD7896 Analog Devices Data Handbook/Manual

2.7 V to 5.5 V, 12-Bit, 8
s ADC in 8-Lead SOIC/PDIP

AD7896*

FEATURES FUNCTIONAL BLOCK DIAGRAM 100 k Hz Throughput Rate Fast 12-Bit Sampling ADC with 8
s Conversion Time

8-Lead PDIP and SOIC Single 2.7 V to 5.5 V Supply Operation AD7896 High Speed, Easy-to-Use Serial Interface TRACK-AND-HOLD On-Chip Track-and-Hold Amplifier

Analog Input Range Is 0 V to Supply

12-BIT

High Input Impedance ADC Low Power: 9 m W Typ

OUTPUT

CONVST

REGISTER

CLOCK

AGND DGND BUSY SCLK SDATA

GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7896 is a fast, 12-bit ADC that operates from a single 1. Complete, 12-bit ADC in an 8-Lead Package. 2.7 V to 5.5 V supply and is housed in small 8-lead PDIP and The AD7896 contains an 8 µs ADC, a track-and-hold ampli- 8-lead SOIC packages. The part contains an 8 µs successive fier, control logic, and a high speed serial interface, all in an approximation ADC, an on-chip track-and-hold amplifier, an 8-lead PDIP. The VDD input is used as the reference for the

on-chip clock, and a high speed serial interface. part, so no external reference is needed. This offers consider- able space saving over alternative solutions.

Output data from the AD7896 is provided via a high speed,

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serial interface port. This 2-wire serial interface has a serial 2. Low Power, Single-Supply Operation. clock input and a serial data output with the external serial The AD7896 operates from a single 2.7 V to 5.5 V supply clock accessing the serial data from the part. and consumes only 9 m W typical. The automatic power- down mode, where the part goes into power down once

In addition to the traditional dc accuracy specifications, such as

conversion is complete and “wakes up” before the next con-

linearity, full-scale, and offset errors, the AD7896 is also speci-

version cycle, makes the AD7896 ideal for battery-powered

fied for dynamic performance parameters, including harmonic

or portable applications.

distortion and signal-to-noise ratio.

3. High Speed Serial Interface.

The part accepts an analog input range of 0 V to VDD and operates

The part provides high speed serial data and serial clock lines

from a single 2.7 V to 5.5 V supply, consuming only 9 m W

allowing for an easy, 2-wire serial interface arrangement.

typical. The VDD 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 conver- sion 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).

*Patent Pending

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