REV. A
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a
AD7545
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 World Wide Web Site: http://www.analog.com
Fax: 617/326-8703 © Analog Devices, Inc., 1997
CMOS 12-Bit
Buffered Multiplying DAC
FUNCTIONAL BLOCK DIAGRAM
19
16
17
20
1
2
3
18
AD7545
R
R
FB
OUT 1
AGND
V
DD
DGND
DB11–DB0
(PINS 4–15)
12
12
12-BIT
MULTIPLYING DAC
INPUT DATA LATCHES
V
REF
WR
CS
FEATURES
12-Bit Resolution
Low Gain TC: 2 ppm/H11543C typ
Fast TTL Compatible Data Latches
Single +5 V to +15 V Supply
Small 20-Lead 0.3" DIP and 20-Terminal Surface Mount
Packages
Latch Free (Schottky Protection Diode Not Required)
Low Cost
Ideal for Battery Operated Equipment
PIN CONFIGURATIONS
DIP LCCC PLCC
GENERAL DESCRIPTION
The AD7545 is a monolithic 12-bit CMOS multiplying DAC
with onboard data latches. It is loaded by a single 12-bit wide
word and directly interfaces to most 12- and 16-bit bus systems.
Data is loaded into the input latches under the control of the CS
and WR inputs; tying these control inputs low makes the input
latches transparent, allowing direct unbuffered operation of the
DAC.
The AD7545 is particularly suitable for single supply operation
and applications with wide temperature variations.
The AD7545 can be used with any supply voltage from +5 V to
+15 V. With CMOS logic levels at the inputs the device dissi-
pates less than 0.5 mW for V
DD
= +5 V.
20 19
18
DB6 DB5 DB4 DB3 DB2
123
4
5
6
7
8
9 10 11 12 13
14
15
16
17
DGND
TOP VIEW
(Not to Scale)
PIN 1
IDENTIFIER
AGND
DB11 (MSB)
DB10
R
FB
DB9
V
REF
DB8
DB7
V
DD
WR
OUT 1
CS
DB0 (LSB)
DB1
AD7545
14
13
12
11
17
16
15
20
19
18
10
9
8
1
2
3
4
7
6
5
TOP VIEW
(Not to Scale)
AD7545
OUT 1
WR
V
DD
V
REF
R
FB
AGND
DGND
DB11 (MSB)
DB1
DB0 (MSB)
CSDB10
DB9
DB8
DB7
DB6
DB5 DB4
DB3
DB2
20 19123
18
14
15
16
17
4
5
6
7
8
910111213
TOP VIEW
(Not to Scale)
AD7545
DB11 (MSB)
DB10
DB9
DB8
DB7
V
DD
WR
CS
DB0 (LSB)
DB1
DB6 DB5 DB4 DB3 DB2
DGND AGND OUT 1 V
REF
R
FB