2
LC MOS
P-Compatible 14-Bit DAC
a
AD7538
FUNCTIO NAL BLO CK D IAGRAM
FEATURES
All Grades 14-Bit Monotonic Over the Full Tem perature
Range
Low Cost 14-Bit Upgrade for 12-Bit System s
14-Bit Parallel Load w ith Double Buffered Inputs
Sm all 24-Pin, 0.3؆ DIP and SOIC
Low Output Leakage (<20 nA) Over the Full
Tem perature Range
APPLICATIONS
Microprocessor Based Control System s
Digital Audio
Precision Servo Control
Control and Measurem ent in High Tem perature
Environm ents
P RO D UCT H IGH LIGH TS
GENERAL D ESCRIP TIO N
1. Guaranteed Monotonicity
T he AD7538 is a 14-bit monolithic CMOS D/A converter
which uses laser trimmed thin-film resistors to achieve excellent
linearity.
T he AD7538 is guaranteed monotonic to 14-bits over the
full temperature range for all grades.
2. Low Cost
T he DAC is loaded by a single 14-bit wide word using standard
Chip Select and Memory Write Logic. Double buffering, which
is optional using LDAC, allows simultaneous update in a sys-
tem containing multiple AD7538s.
T he AD7538, with its 14-bit dynamic range, affords a low
cost solution for 12-bit system upgrades.
3. Small Package Size
T he AD7538 is packaged in a small 24-pin, 0.3" DIP and a
24-pin SOIC.
A novel low leakage configuration (U.S. Patent No. 4,590,456)
enables the AD7538 to exhibit excellent output leakage current
characteristics over the specified temperature range.
4. Low Output Leakage
By tying VSS (Pin 24) to a negative voltage, it is possible to
achieve a low output leakage current at high temperatures.
T he AD7538 is manufactured using the Linear Compatible
CMOS (LC2MOS) process. It is speed compatible with most
microprocessors and accepts T T L or CMOS logic level inputs.
5. Wide Power Supply T olerance
T he device operates on a +12 V to +15 V VDD, with a ±5%
tolerance on this nominal figure. All specifications are
guaranteed over this range.
REV. A
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703