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AD7112CR Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD7112CR Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 12 page REV. 0 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. a LC2MOS LOGDAC Dual Logarithmic D/A Converter AD7112* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FUNCTIONAL BLOCK DIAGRAM 17-BIT DAC A AD7112 OUT A AGND DGND CS WR 17-BIT LATCH 17 17-BIT LATCH 17-BIT DAC B RFB A OUT B RFB B DECODE LOGIC VIN B VIN A DAC A/ DAC B CONTROL LOGIC 8-BIT BUFFER DB0 DB7 VDD FEATURES Dynamic Range: 88.5 dB Resolution: 0.375 dB On-Chip Data Latches for Both DACs Four-Quadrant Multiplication +5 V Operation Pin Compatible with AD7528 Low Power APPLICATIONS Audio Attenuators Sonar Systems Function Generators GENERAL DESCRIPTION The LOGDAC® AD7112 is a monolithic dual multiplying D/A converter featuring wide dynamic range and excellent DAC-to- DAC matching. Both DACs can attenuate an analog input sig- nal over the range 0 dB to 88.5 dB in 0.375 dB steps. It is available in skinny 0.3" wide 20-pin DIPs and in 20-terminal surface mount packages. The degree of attenuation in either channel is determined by the 8-bit word applied to the onboard decode logic. This 8-bit word is decoded into a 17-bit word which is then loaded into one of the 17-bit data latches, determined by DACA/DACB. The fine step resolution over the entire dynamic range is due to the use of these 17-bit DACs. The AD7112 is easily interfaced to a standard 8-bit MPU bus via an 8-bit data port and standard microprocessor control lines. It should be noted that the AD7112 is exactly pin-compatible with the AD7528, an industry standard dual 8-bit multiplying DAC. This allows an easy upgrading of existing AD7528 de- signs which would benefit both from the wider dynamic range and the finer step resolution offered by the AD7112. The AD7112 is fabricated in Linear Compatible CMOS (LC2MOS), an advanced, mixed technology process that com- bines precision bipolar circuits with low power CMOS logic. *Protected by U.S. Patent No. 4521764. LOGDAC is a registered trademark of Analog Devices, Inc. PRODUCT HIGHLIGHTS 1. DAC-to-DAC Matching: Since both of the AD7112 DACs are fabricated at the same time on the same chip, precise matching and tracking between the two DACs is inherent. 2. Small Package: The AD7112 is available in a 20-pin DIP and a 20-terminal SOIC package. 3. Fast Microprocessor Interface: The AD7112 has bus inter- face timing compatible with all modern microprocessors. |
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