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a FEATURES 100 kHz Throughput Rate Fast 12-Bit Sampling ADC with 8 ␮s Conversion Time 8-Pin Mini-DIP and SOIC Single +2.7 V to +5.5 V Supply Operation High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier Analog Input Range is 0 V to Supply High Input Impedance Low Power: 9 mW typ

2.7 V to 5.5 V, 12-Bit, 8 ␮s ADC in 8-Pin SO/DIP AD7896* FUNCTIONAL BLOCK DIAGRAM VDD

AD7896 TRACK/HOLD V IN 12-BIT ADC

OUTPUT REGISTER

CONVST CLOCK

AGND

DGND

BUSY

SCLK

SDATA

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7896 is a fast, 12-bit ADC which operates from a single +2.7 V to 5.5 V supply and is housed in a small 8-pin mini-DIP and 8-pin SOIC. The part contains an 8 µs successive approximation A/D converter, an on-chip track/hold amplifier, an onchip clock and a high speed serial interface.

1. Complete, 12-bit ADC in 8-Pin Package The AD7896 contains an 8 µs ADC, a track/hold amplifier, control logic and a high speed serial interface, all in an 8-pin DIP. 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.

Output data from the AD7896 is provided via a high speed, serial interface port. This two-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 VDD and operates from a single +2.7 V to +5.5 V supply consuming only 9 mW typical. The VDD input is also used as the reference for the part so that no external reference is required.

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 power down 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, two-wire serial interface arrangement.

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 conversion is complete and “wakes up” before the next conversion cycle. The part is available in a small, 8-pin, 0.3 wide, plastic or hermetic dual-in-line package (mini-DIP) and in an 8-pin, small outline IC (SOIC). *Patent pending.

REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

© Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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