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LTC1458/LTC1458L

Quad 12-Bit Rail-to-Rail

Micropower DACs

Daisy-Chained Control Outputs

The LTC

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

converters (DACs) in SO-28 and SSOP-28 packages. They

include an output buffer amplifier with variable gain (

×1 or

×2) and an easy-to-use 3-wire cascadable serial interface.

The LTC1458 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 dissipating

The LTC1458L has an onboard 1.22V reference and a full-

scale output of 2.5V in a

×2 gain configuration. It operates

from a single supply of 2.7V to 5.5V dissipating 2.4mW.

Excellent DNL, low supply current and a wide range of

built-in functions allow these parts to be used in a host of

applications when flexibility, power and single supply

operation are important.

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Quad 12-Bit DAC

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Buffered True Rail-to-Rail Voltage Output

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Maximum DNL Error: 0.5LSB

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Internal or External Reference Operation

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Settling Time: 14

µs to ±0.5LSB

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Schmitt Trigger On Clock Input Allows Direct

Optocoupler Interface

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Power-On Reset and CLR Pin

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SSOP-28 Package

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3-Wire Cascadable Serial Interface with 250kHz

Update Rate

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Low Cost

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

Differential Nonlinearity

vs Input Code

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Digital Calibration

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Industrial Process Control

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Automatic Test Equipment

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Low Power Systems

1458 BD01

48-BIT

SHIFT REGISTER

AND

DAC REGISTER

CLK

5V (LTC1458)

3V TO 5V (LTC1458L)

2.048V (LTC1458)

1.22V (LTC1458L)

REFHI C

REFOUT

REFLO C

X1/X2 C

X1/X2 D

X1/X2 A

X1/X2 B

REFHI D

REFLO D

REFHI B

FROM

µP

REFLO B

REFHI A

REFLO A

CS/LD

CLR

DAC D

DAC C

DAC B

DAC A

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

1458 G09

512

1536

3072 3584 4095

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO

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