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LTC1655/LTC1655L

16-Bit Rail-to-Rail

Micropower DACs in

SO-8 Package

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16-Bit Monotonicity Over Temperature

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Deglitched Rail-to-Rail Voltage Output

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SO-8 Package

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Internal Reference: 2.048V (LTC1655)

1.25V (LTC1655L)

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Maximum DNL Error:

±1LSB

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Settling Time: 20

µS to ±1LSB

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750kHz Max Update Rate

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Power-On Reset to Zero Volts

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3-Wire Cascadable Serial Interface

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Low Cost

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Pin Compatible Upgrade for LTC1451 12-Bit DAC

Family

The LTC

16-bit digital-to-analog converters in an SO-8 package.

They include an output buffer and a reference. The 3-wire

serial interface is compatible with SPI/QSPI and

MICROWIRE

trigger that allows direct optocoupler interface.

The LTC1655 has an onboard 2.048V reference that can be

overdriven to a higher voltage. The output swings from 0V

to 4.096V when using the internal reference. The typical

power dissipation is 3.0mW on a single 5V supply.

The LTC1655L has an onboard 1.25V reference that can be

overdriven to a higher voltage. The output swings from 0V

to 2.5V when using the internal reference. The typical

power dissipation is 1.8mW on a single 3V supply.

The LTC1655/LTC1655L are pin compatible with Linear

upgrade path. They are the only buffered 16-bit DACs in

an SO-8 package and they include an onboard reference

for standalone performance.

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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.

MICROWIRE is a trademark of National Semiconductor Corporation.

–

+

16-BIT

DAC

LTC1655: 4.5V TO 5.5V

LTC1655L: 2.7V TO 5.5V

LTC1655: 2.048V

LTC1655L: 1.25V

GND

POWER-ON

RESET

TO

OTHER

DACS

16-BIT

SHIFT

REG

AND

DAC

LATCH

µP

16

REF

2

86

4

5

1655/55L TA01

CLK

1

CS/LD

3

7

REF

Functional Block Diagram: 16-Bit Rail-to-Rail DAC

Differential Nonlinearity

vs Input Code

CODE

0

– 1.0

– 0.2

– 0.4

– 0.6

– 0.8

0

0.2

0.4

0.6

0.8

1.0

16384

32768

1655/55L TA02

49152

65535

APPLICATIO S

FEATURES

DESCRIPTIO

FU CTIO AL BLOCK DIAGRA