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CMOS 12-Bit Buffered Multiplying DAC AD7545

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

FUNCTIONAL BLOCK DIAGRAM RFB 20

AD7545

VREF 19

1

OUT 1

2

12-BIT MULTIPLYING DAC

AGND

12 WR 17 CS 16

GENERAL DESCRIPTION

R

RY NA AL I IM IC EL HN PR EC TA T DA

18 VDD INPUT DATA LATCHES 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 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 can be used with any supply voltage from +5 V to +15 V. With CMOS logic levels at the inputs the device dissipates less than 0.5 mW for VDD = +5 V.

PIN CONFIGURATIONS

DB11 (MSB) 4

18 VDD

16 CS

DB10 5

AD7545

17 WR

DB10 5

DB9 6

TOP VIEW (Not to Scale)

16 CS

DB9 6

15 DB0 (LSB)

DB8 7

1

20 19

DB10 5 DB9 6 DB8 7

AD7545

TOP VIEW 15 DB0 (MSB) (Not to Scale) 14 DB1

16 CS 15 DB0 (LSB)

DB7 8

14 DB1

DB2

DB3

DB4

10 11 12 13 DB5

DB6

DB2

9

DB3

9 10 11 12 13 DB4

11 DB4

18 VDD 17 WR

AD7545 TOP VIEW (Not to Scale)

DB6

12 DB3

DB5 10

PIN 1 IDENTIFIER

DB11 (MSB) 4

13 DB2

DB6 9

14 DB1

DB7 8

DB5

DB7 8

DB8 7

VREF

17 WR

2

18 VDD

DB11 (MSB) 4

RFB

19 VREF

DGND 3

RFB

20 RFB

AGND 2

AGND

3

1 20 19

OUT 1 1

OUT 1

2

DGND

3

PLCC

VREF

AGND

OUT 1

LCCC

DGND

DIP

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


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