AD7545 Analog Devices, AD7545 Datasheet

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AD7545

Manufacturer Part Number
AD7545
Description
CMOS 12-Bit Buffered Multiplying DAC
Manufacturer
Analog Devices
Datasheet

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a
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.
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.
DB11 (MSB)
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
Latch Free (Schottky Protection Diode Not Required)
Low Cost
Ideal for Battery Operated Equipment
OUT 1
AGND
DGND
Packages
DB10
DB9
DB8
DB7
DB6
DB5
10
1
2
3
4
5
6
7
8
9
(Not to Scale)
TOP VIEW
AD7545
DIP
20
19
18
17
16
15
14
13
12
11
R
V
V
WR
CS
DB0 (MSB)
DB1
DB2
DB3
DB4
REF
DD
FB
DB11 (MSB)
DB10
DB9
DB8
DB7
4
5
6
7
8
PIN CONFIGURATIONS
3
9 10 11 12 13
(Not to Scale)
TOP VIEW
LCCC
2
AD7545
1
20 19
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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
18
17
16
15
14
V
REF
WR
V
WR
CS
DB0 (LSB)
DB1
CS
DD
19
17
16
FUNCTIONAL BLOCK DIAGRAM
Buffered Multiplying DAC
AD7545
World Wide Web Site: http://www.analog.com
DB11 (MSB)
INPUT DATA LATCHES
MULTIPLYING DAC
DD
DB10
DB9
DB8
DB7
(PINS 4–15)
DB11–DB0
= +5 V.
12-BIT
4
5
6
7
8
12
12
© Analog Devices, Inc., 1997
3
9
CMOS 12-Bit
(Not to Scale)
PLCC
10 11 12 13
TOP VIEW
2
AD7545
AD7545
1
PIN 1
IDENTIFIER
R
20
20 19
FB
R
18
1
2
3
18
16
14
17
15
OUT 1
AGND
V
DGND
DD
V
WR
CS
DB0 (LSB)
DB1
DD

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AD7545 Summary of contents

Page 1

... CS 16 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 + +15 V. With CMOS logic levels at the inputs the device dissi- pates less than 0.5 mW for V PIN CONFIGURATIONS ...

Page 2

... AD7545–SPECIFICATIONS Parameter Version STATIC PERFORMANCE Resolution All GL, GC, GU Differential Nonlinearity GL, GC Gain Error (Using Internal RFB GL, GC Gain Temperature Coefficient ∆Gain/∆Temperature All 3 DC Supply Rejection ∆ ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7545 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... CMOS compatible only, i.e., 1.5 V and 13 BASIC APPLICATIONS Figures 4 and 5 show simple unipolar and bipolar circuits using the AD7545. Resistor R1 is used to trim for full scale. The R FB “G” versions (AD7545GLN, AD7545GCQ, AD7545GUD) OUT 1 have a guaranteed maximum gain error of ± 1 LSB at +25°C ...

Page 5

... V OUT R3 Pins 2 and 3 and between Pins 18 and 19 of the AD7545. Note A2 10kΩ how the analog pins are at one end of the package and separated AD544J 10% from the digital pins by V 1/2 AD7592JN the board level ...

Page 6

... V used to power the AD7545 is free from digitally induced noise. Temperature Coefficients: The gain temperature coefficient of the AD7545 has a maximum value of 5 ppm/°C and a typical value of 2 ppm/°C. This corresponds to worst case gain shifts of 2 LSBs and 0.8 LSBs respectively over a 100°C temperature range ...

Page 7

... Figure 10. Single Supply “Bipolar” Twos Complement D/A Converter MICROPROCESSOR INTERFACING OF THE AD7545 The AD7545 can directly interface to both 8- and 16-bit micro- processors via its 12-bit wide data latch using standard CS and WR control signals. A typical interface circuit for an 8-bit processor is shown in Figure 11. This arrangement uses two memory addresses, one for the lower eight bits of data to the DAC and one for the up- per four bits of data into the DAC via the latch ...

Page 8

... AD7545 20-Lead Plastic DIP (N-20) 20-Terminal Leadless Ceramic Chip Carrier (LCCC) (E-20A) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Lead Plastic Leaded Chip Carrier (PLCC) –8– 20-Lead Cerdip (Q-20) (P-20A) REV. A ...

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