LTC1661 Linear Technology, LTC1661 Datasheet

LTC1661

Manufacturer Part Number

LTC1661

Description

Micropower Dual 10-Bit DAC in MSOP

Manufacturer

Linear Technology

Datasheet

1.LTC1661.pdf (12 pages)

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APPLICATIO S

FEATURES

BLOCK DIAGRA

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

Tiny: Two 10-Bit DACs in an 8-Lead MSOP—

Half the Board Space of an SO-8

Micropower: 60 A per DAC

Sleep Mode: 1 A for Extended Battery Life

Rail-to-Rail Voltage Outputs Drive 1000pF

Wide 2.7V to 5.5V Supply Range

Double Buffered for Independent or Simultaneous

DAC Updates

Reference Range Includes Supply for Ratiometric

0V-to-V

Reference Input Has Constant Impedance over All

Codes (260k Typ)—Eliminates External Buffers

3-Wire Serial Interface with

Schmitt Trigger Inputs

Differential Nonlinearity:

Mobile Communications

Digitally Controlled Amplifiers and Attenuators

Portable Battery-Powered Instruments

Automatic Calibration for Manufacturing

Remote Industrial Devices

OUT A

GND

10-BIT

DAC A

Output

CS/LD

CONTROL

LOGIC

SCK

0.75LSB Max

SHIFT REGISTER

ADDRESS

DECODER

10-BIT

DAC B

DESCRIPTIO

The LTC

sable, 10-bit digital-to-analog converters (DACs) in a

single tiny MS8 package. Each buffered DAC draws just

60 A total supply current, yet is capable of supplying DC

output currents in excess of 5mA and reliably driving

capacitive loads up to 1000pF. Sleep mode further re-

duces total supply current to a negligible 1 A.

Linear Technology’s proprietary, inherently monotonic

voltage interpolation architecture provides excellent lin-

earity while allowing for an exceptionally small external

form factor. The double-buffered input logic provides

simultaneous update capability and can be used to write to

either DAC without interrupting Sleep mode.

Ultralow supply current, power-saving Sleep mode and

extremely compact size make the LTC1661 ideal for

battery-powered applications, while its straightforward

usability, high performance and wide supply range make

it an excellent choice as a general purpose converter.

For additional outputs and even greater board density,

please refer to the LTC1660 micropower octal DAC for

10-bit applications. For 8-bit applications, please consult

the LTC1665 micropower octal DAC.

1661 BD

OUT B

REF

1661 integrates two accurate, serially addres-

10-Bit DAC in MSOP

–0.20

–0.40

–0.60

–0.75

0.75

0.60

0.40

0.20

Micropower Dual

Differential Nonlinearity (DNL)

256

CODE

512

LTC1661

768

1661 G02

1023

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