1

LTC1590

Dual Serial 12-Bit

Multiplying DAC

Daisy-Chained Control Outputs

The LTC

digital-to-analog converter (DAC). It includes two current

output multiplying CMOS DACs and an easy SPI compat-

ible serial interface with daisy-chain output. An asynchro-

nous CLR pin sets both DACs to zero scale.

Excellent accuracy, stability and versatility are combined

with the smallest package available for a dual 12-bit

multiplying DAC.

Parts are available in 16-pin PDIP and narrow SO pack-

ages and are specified over the commercial and industrial

temperature ranges.

FEATURES

s

DNL and INL Over Temperature:

s

Gain Error:

s

Low Supply Current: 10

s

4-Quadrant Multiplication

s

Power-On Reset

s

Asynchronous Clear Input

s

Daisy-Chain 3-Wire Serial Interface

s

16-Pin Narrow SO and PDIP Packages

s

Process Control and Industrial Automation

s

Software Controlled Gain Adjustment

s

Digitally Controlled Filter and Power Supplies

s

Automatic Test Equipment

, LTC and LT are registered trademarks of Linear Technology Corporation.

Integral Nonlinearity Over

Temperature DAC A

DIGITAL INPUT CODE

0

1024

2048

3072

4095

LTC1590 • TA02

1.0

0.5

0

–0.5

–1.0

512

1536

2560

3584

THREE

SUPERIMPOSED

CURVES

25

°C, 85°C

DIGITAL INPUT CODE

0

1024

2048

3072

4095

LTC1590 • TA03

1.0

0.5

0

–0.5

–1.0

512

1536

2560

3584

THREE

SUPERIMPOSED

CURVES

25

°C, 85°C

Integral Nonlinearity Over

Temperature DAC B

13

16

9

1

2

12

10

LTC1590 • TA01

14

11

3

6

5

4

8

±10V

±10V

5V

±10V

±10V

15

5V

7

33pF

33pF

LT

15V

–15V

DAC B

DAC A

24-BIT

SHIFT

REG

AND

LATCH

CLK

CS/LD

CLR

DGND

AGND

LTC1590

OUT1 B

OUT2 B

OUT1 A

OUT2 A

µP

+

–

+

–

Dual 12-Bit 2-Quadrant Multiplying DAC