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Analog Devices - LC2MOS LOGDAC Dual Logarithmic D/A Converter

Numéro de référence AD7112
Description LC2MOS LOGDAC Dual Logarithmic D/A Converter
Fabricant Analog Devices 
Logo Analog Devices 





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AD7112 fiche technique
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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
AD7112
17-BIT DAC A
RFB A
OUT A
DB0
DB7
8-BIT
BUFFER
CONTROL
LOGIC
17-BIT LATCH
DECODE LOGIC
17-BIT1L7ATCH
17-BIT DAC B
RFB B
OUT B
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.
DAC A/ CS WR VIN B
DAC B
DGND
AGND
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

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