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a FEATURES Fast 12-Bit ADC with 6 ␮s Conversion Time 8-Pin Mini-DlP and SOIC Single Supply Operation High Speed, Easy-to-Use, Serial Interface On-Chip Track/Hold Amplifier Selection of Input Ranges ؎10 V for AD7893-10 ؎2.5 V for AD7893 0 V to +2.5 V for AD7893-2 0 V to +5 V for AD7893-5 Low Power: 25 mW typ

LC2MOS 12-Bit, Serial 6 ␮s ADC in 8-Pin Package AD7893 FUNCTIONAL BLOCK DIAGRAM REF IN

VDD

AD7893

VIN

SIGNAL SCALING*

TRACK/ HOLD 12-BIT ADC

OUTPUT REGISTER

CONVST

AGND

DGND

SCLK

SDATA

  • AD7893-5, AD7893-10, AD7893

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7893 is a fast, 12-bit ADC that operates from a single +5 V supply and is housed in a small 8-pin mini-DIP and 8-pin SOIC. The part contains a 6 µs successive approximation A/D converter, an on-chip track/hold amplifier, an on-chip clock and a high speed serial interface.

1. Fast, 12-Bit ADC in 8-Pin Package The AD7893 contains a 6 µs ADC, a track/hold amplifier, control logic and a high speed serial interface, all in an 8-pin package. This offers considerable space saving over alternative solutions.

Output data from the AD7893 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.

2. Low Power, Single Supply Operation The AD7893 operates from a single +5 V supply and consumes only 25 mW. This low power, single supply operation makes it ideal for battery powered or portable applications.

In addition to traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7893 is also specified for dynamic performance parameters, including harmonic distortion and signal-to-noise ratio.

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 part accepts an analog input range of ± 10 V (AD7893-10), ± 2.5 V (AD7893), 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 mW typical. The AD7893 is fabricated in Analog Devices’ Linear Compatible 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. E 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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997


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