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LTC1454/LTC1454L

Dual 12-Bit Rail-to-Rail

Micropower DACs

Daisy-Chained Control Outputs

Functional Block Diagram: Dual 12-Bit Rail-to-Rail DAC

X1/X2 B

X1/X2 A

CLK

POWER-ON

RESET

–

+

12-BIT

DAC A

12-BIT

DAC B

REFOUT

CS/LD

REFHI B

REFHI A

REFLO

GND

14

16

1

11

8

7

12

2

6

5

3

4

9, 15

LTC1454: 5V

LTC1454L: 3V TO 5V

LTC1454: 2.048V

LTC1454L: 1.22V

10

13

–

+

CLR

1454 BD02

24-BIT

SHIFT

REG

AND

DAC

LATCH

µP

Differential Nonlinearity

vs Input Code

CODE

0

0.5

0.4

0.3

0.2

0.1

0

–0.1

–0.2

–0.3

–0.4

–0.5

1024

2048 2560

1454 G08

512

1536

3072 3584 4095

FEATURES

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12-Bit Resolution

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Buffered True Rail-to-Rail Voltage Output

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s

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Built-In Reference: 2.048V (LTC1454)

1.220V (LTC1454L)

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CLR Pin

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Power-On Reset

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16-Lead SO Package

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3-Wire Cascadable Serial Interface

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Maximum DNL Error: 0.5LSB

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Low Cost

The LTC

dual rail-to-rail voltage output, 12-bit digital-to-analog

converters (DACs) in a 16-lead SO package. They include

an output buffer amplifier with variable gain (

×1 or ×2)

and an easy-to-use 3-wire cascadable serial interface.

The LTC1454 has an onboard reference of 2.048V and a

full-scale output of 4.095V in a

×2 gain configuration. It

operates from a single 4.5V to 5.5V supply.

The LTC1454L has an onboard 1.22V reference and a full-

scale output of 2.5V in a

×2 gain configuration. It operates

from a single 2.7V to 5.5V supply.

Low power supply current, excellent DNL and small size

allow these parts to be used in a host of applications where

size, DNL and single supply operation are important.

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Digital Calibration

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Industrial Process Control

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Automatic Test Equipment

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Cellular Telephones

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