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a FEATURES On-Chip Latches for Both DACs +12 V to +15 V Operation DACs Matched to 1% Four Quadrant Multiplication TTL/CMOS Compatible from +12 V to +15 V Latch Free (Protection Schottkys not Required)

CMOS Dual 8-Bit Buffered Multiplying DAC AD7628 FUNCTIONAL BLOCK DIAGRAM

APPLICATIONS Disk Drives Programmable Filters X-Y Graphics Gain/Attenuation

GENERAL DESCRIPTION

PRODUCT HIGHLIGHTS

The AD7628 is a monolithic dual 8-bit digital/analog converter featuring excellent DAC-to-DAC matching. It is available in small 0.3" wide 20-pin DIPs and in 20-terminal surface mount packages.

1. DAC to DAC matching: since both of the AD7628 DACs are fabricated at the same time on the same chip, precise matching and tracking between DAC A and DAC B is inherent. The AD7628’s matched CMOS DACs make a whole new range of applications circuits possible, particularly in the audio, graphics and process control areas.

Separate on-chip latches are provided for each DAC to allow easy microprocessor interface. Data is transferred into either of the two DAC data latches via a common 8-bit TTL/CMOS compatible input port. Control input DAC A/DAC B determines which DAC is to be loaded. The AD7628’s load cycle is similar to the write cycle of a random access memory, and the device is bus compatible with most 8-bit microprocessors, including 6502, 6809, 8085, Z80. The device operates from a +12 V to +15 V power supply and is TTL-compatible over this range. Power dissipation is a low 20 mW.

2. Small package size: combining the inputs to the on-chip DAC latches into a common data bus and adding a DAC A/ DAC B select line has allowed the AD7628 to be packaged in a small 20-pin 0.3" wide DIP, 20-pin SOIC, 20-terminal PLCC and 20-terminal LCC. 3. TTL-Compatibility: All digital inputs are TTL-compatible over a +12 V to +15 V power supply range.

Both DACs offer excellent four quadrant multiplication characteristics with a separate reference input and feedback resistor for each DAC.

REV. A 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., 1996


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