AD7845| Datasheet

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FEATURES 12-Bit CMOS MDAC with Output Amplifier 4-Quadrant Multiplication Guaranteed Monotonic (TMIN to T MAX) Space-Saving 0.3" DIPs and 24- or 28-Terminal Surface Mount Packages Application Resistors On Chip for Gain Ranging, etc. Low Power LC 2MOS APPLICATIONS Automatic Test Equipment Digital Attenuators Programmable Power Supplies Programmable Gain Amplifiers Digital-to-4 20 mA Converters

LC2MOS Complete 12-Bit Multiplying DAC AD7845
FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7845 is the industry's first 4-quadrant multiplying D/A converter with an on-chip amplifier. It is fabricated on the LC2MOS process, which allows precision linear components and digital circuitry to be implemented on the same chip. The 12 data inputs drive latches which are controlled by standard CS and WR signals, making microprocessor interfacing simple. For stand-alone operation, the CS and WR inputs can be tied to ground, making all latches transparent. All digital inputs are TTL and 5 V CMOS compatible. The output amplifier can supply 10 V into a 2 k load. It is internally compensated, and its input offset voltage is low due to laser trimming at wafer level. For normal operation, RFB is tied to VOUT, but the user may alternatively choose RA, RB or RC to scale the output voltage range.

1. Voltage Output Multiplying DAC The AD7845 is the first DAC which has a full 4-quadrant multiplying capability and an output amplifier on chip. All specifications include amplifier performance. 2. Matched Application Resistors Three application resistors provide an easy facility for gain ranging, voltage offsetting, etc. 3. Space Saving The AD7845 saves space in two ways. The integration of the output amplifier on chip means that chip count is reduced. The part is housed in skinny 24-lead 0.3" DIP, 28-terminal LCC and PLCC and 24-terminal SOIC packages.

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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: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1999