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AD7112

Analog Devices
Part Number AD7112
Manufacturer Analog Devices
Description LC2MOS LOGDAC Dual Logarithmic D/A Converter
Published Mar 23, 2005
Detailed Description a FEATURES Dynamic Range: 88.5 dB Resolution: 0.375 dB On-Chip Data Latches for Both DACs Four-Quadrant Multiplication +...
Datasheet PDF File AD7112 PDF File

AD7112
AD7112

Overview
a 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 LC2MOS LOGDAC Dual Logarithmic D/A Converter AD7112* FUNCTIONAL BLOCK DIAGRAM VDD VIN A RFB A OUT A AD7112 17-BIT DAC A 17-BIT LATCH DB0 DB7 8-BIT BUFFER DECODE LOGIC 17 17-BIT LATCH RFB B CONTROL LOGIC OUT B 17-BIT DAC B GENERAL DESCRIPTION DAC A/ CS WR VIN B DAC B DGND AGND The LOGDAC® AD7112 is a monolithic dual multiplying D/A converter featuring wide dynamic range and excellent DAC-toDAC matching.
Both DACs can attenuate an analog input signal 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 designs 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 combines 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 an...


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