ANALOG DEVICES AD7893 datasheet user manual.

LC2MOS 12-Bit, Serial 6 ms ADC in 8-Pin Package

AD7893

FEATURES FUNCTIONAL BLOCK DIAGRAM

Fast 12-Bit ADC with 6 ms Conversion Time

REF IN VDD

8-Pin Mini-Dl P and SOIC Single Supply Operation AD7893 High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier

TRACK/ Selection of Input Ranges SIGNAL HOLD

SCALING*

610 V for AD7893-10 12-BIT ADC

62.5 V for AD7893-3 0 V to +2.5 V for AD7893-2 0 V to +5 V for AD7893-5 OUTPUT

CONVST

REGISTER

Low Power: 25 m W typ

AGND DGND SCLK SDATA

*AD7893-5, AD7893-10, AD7893-3

GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7893 is a fast, 12-bit ADC that operates from a single 1. Fast, 12-Bit ADC in 8-Pin Package +5 V supply and is housed in a small 8-pin mini-DIP and 8-pin The AD7893 contains a 6 µs ADC, a track/hold amplifier, SOIC. The part contains a 6 µs successive approximation A/D control logic and a high speed serial interface, all in an 8-pin converter, an on-chip track/hold amplifier, an on-chip clock and package. This offers considerable space saving over alterna- a high speed serial interface. tive solutions. Output data from the AD7893 is provided via a high speed, 2. Low Power, Single Supply Operation

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serial interface port. This two-wire serial interface has a serial The AD7893 operates from a single +5 V supply and con- clock input and a serial data output with the external serial clock sumes only 25 m W. This low power, single supply operation accessing the serial data from the part. makes it ideal for battery powered or portable applications. In addition to traditional dc accuracy specifications such as lin- 3. High Speed Serial Interface earity, full-scale and offset errors, the AD7893 is also specified The part provides high speed serial data and serial clock lines, for dynamic performance parameters, including harmonic dis- allowing for an easy, two-wire serial interface arrangement.

tortion and signal-to-noise ratio. The part accepts an analog input range of ±10 V (AD7893-10), ±2.5 V (AD7893-3), 0 V to +5 V (AD7893-5) or 0 V to +2.5 V (AD7893-2) and operates from a single +5 V supply, consuming only 25 m W typical. The AD7893 is fabricated in Analog Devices’ Linear Compat- ible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. 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).

REV. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or Tel: 617/329-4700 World Wide Web Site: http://www.analog.com otherwise under any patent or patent rights of Analog Devices. Fax: 617/326-8703 © Analog Devices, Inc., 1997