a
FEATURES
12-Bit Resolution
Low Gain TC: 2 ppm/ C 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
V
REF
19
CMOS 12-Bit
Buffered Multiplying DAC
AD7545
FUNCTIONAL BLOCK DIAGRAM
R
FB
20
AD7545
12-BIT
MULTIPLYING DAC
R
1
2
OUT 1
AGND
12
WR
17
CS
16
INPUT DATA LATCHES
3
12
DGND
18 V
DD
DB11–DB0
(PINS 4–15)
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.
PIN CONFIGURATIONS
DIP
DGND
LCCC
DGND
AGND
OUT 1
PLCC
AGND
OUT 1
V
REF
AGND 2
DGND 3
DB11 (MSB) 4
DB10 5
DB9 6
19 V
REF
18 V
DD
17
WR
R
FB
OUT 1 1
20 R
FB
3
DB11 (MSB) 4
DB10 5
DB9 6
DB8 7
DB7 8
2
1 20 19
18 V
DD
3
DB11 (MSB) 4
DB10 5
DB9 6
DB8 7
DB7 8
9
DB6
2
1
20 19
PIN 1
IDENTIFIER
R
FB
V
REF
18 V
DD
17
WR
16
CS
15 DB0 (LSB)
14 DB1
AD7545
16
CS
AD7545
TOP VIEW
(Not to Scale)
17
WR
16
CS
15 DB0 (LSB)
14 DB1
AD7545
TOP VIEW
(Not to Scale)
TOP VIEW 15 DB0 (MSB)
(Not to Scale)
14 DB1
DB8 7
DB7 8
DB6 9
DB5 10
13 DB2
DB6
DB4
DB3
DB5
DB2
12 DB3
11 DB4
9 10 11 12 13
10 11 12 13
DB5
DB4
DB3
DB2
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: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997
AD [ ANALOG DEVICES ]
