AD7545_15 Datasheet, PDF (1/8 Pages) Analog Devices – Buffered Multiplying DAC

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CMOS 12-Bit
Buffered Multiplying DAC
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
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.
AD7545
FUNCTIONAL BLOCK DIAGRAM
AD7545
V_REF 19
12-BIT
MULTIPLYING DAC
R_FB
20
R
1 OUT 1
2 AGND
WR 17
CS 16
12
INPUT DATA LATCHES
18 V_DD
3 DGND
12
DB11–DB0
(PINS 4–15)
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
LCCC
PLCC
OUT 1 1
AGND 2
DGND 3
DB11 (MSB) 4
20 R_FB
19 V_REF
18 V_DD
17 WR
DB10 5 AD7545 16 CS
DB9
6
TOP VIEW
(Not to Scale)
15
DB0 (MSB)
DB8 7
14 DB1
DB7 8
13 DB2
DB6 9
12 DB3
DB5 10
11 DB4
DB11 (MSB) 4
DB10 5
DB9 6
DB8 7
DB7 8
3 2 1 20 19
AD7545
TOP VIEW
(Not to Scale)
18 V_DD
17 _WR
16 _CS
15 DB0 (LSB)
14 DB1
9 10 11 12 13
DB11 (MSB) 4
DB10 5
DB9 6
DB8 7
DB7 8
3 2 1 20 19
PIN 1
IDENTIFIER
AD7545
TOP VIEW
(Not to Scale)
18 V_DD
17 WR
16 CS
15 DB0 (LSB)
14 DB1
9 10 11 12 13
REV. A
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© Analog Devices, Inc., 1997