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FEATURES
Two 12-Bit DACs in One Package
DAC Ladder Resistance Matching: 0.5%
Space Saving Skinny DIP and Surface Mount Packages
4-Quadrant Multiplication
Low Gain Error (1 LSB max Over Temperature)
Byte Loading Structure
Fast Interface Timing
LC2MOS
(8+4) Loading Dual 12-Bit DAC
AD7537
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
Automatic Test Equipment
Programmable Filters
Audio Applications
Synchro Applications
Process Control
GENERAL DESCRIPTION
The AD7537 contains two 12-bit current output DACs on one
monolithic chip. A separate reference input is provided for each
DAC. The dual DAC saves valuable board space, and the
monolithic construction ensures excellent thermal tracking.
Both DACs are guaranteed 12-bit monotonic over the full temperature range.
The AD7537 has a 2-byte (8 LSBs, 4 MSBs) loading structure.
It is designed for right-justified data format. The control signals
for register loading are A0, A1, CS, WR and UPD. Data is
loaded to the input registers when CS and WR are low. To
transfer this data to the DAC registers, UPD must be taken low
with WR.
PRODUCT HIGHLIGHTS
Added features on the AD7537 include an asynchronous CLR
line which is very useful in calibration routines. When this is
taken low, all registers are cleared. The double buffering of the
data inputs allows simultaneous update of both DACs. Also,
each DAC has a separate AGND line. This increases the device
versatility; for instance one DAC may be operated with
AGND biased while the other is connected in the standard
configuration.
2. Small Package Size:
The AD7537 is packaged in small 24-pin 0.3" DIPs and in
28-terminal surface mount packages.
The AD7537 is manufactured using the Linear Compatible
CMOS (LC2MOS) process. It is speed compatible with most
microprocessors and accepts TTL, 74HC and 5 V CMOS logic
level inputs.
1. DAC to DAC Matching:
Since both DACs are fabricated on the same chip, precise
matching and tracking is inherent. Many applications which
are not practical using two discrete DACs are now possible.
Typical matching: 0.5%.
3. Wide Power Supply Tolerance:
The device operates on a +12 V to +15 V VDD, with ± 10%
tolerance on this nominal figure. All specifications are
guaranteed over this range.
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: 781/329-4700
Fax: 781/461-3113
