1

LTC1661

Micropower Dual

10-Bit DAC in MSOP

The LTC

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

single tiny MS8 package. Each buffered DAC draws just

60

µA 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

µA.

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.

s

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

Half the Board Space of an SO-8

s

Micropower: 60

µA per DAC

Sleep Mode: 1

µA for Extended Battery Life

s

Rail-to-Rail Voltage Outputs Drive 1000pF

s

Wide 2.7V to 5.5V Supply Range

s

Double Buffered for Independent or Simultaneous

DAC Updates

s

Reference Range Includes Supply for Ratiometric

s

Reference Input Has Constant Impedance over All

Codes (260k

Ω Typ)—Eliminates External Buffers

s

3-Wire Serial Interface with

Schmitt Trigger Inputs

s

Differential Nonlinearity:

≤±0.75LSB Max

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

CS/LD

1661 BD

1

4

10-BIT

DAC A

10-BIT

DAC B

ADDRESS

DECODER

CONTROL

LOGIC

SHIFT REGISTER

SCK

2

REF

3

8

5

GND

7

6

Differential Nonlinearity (DNL)

s

Mobile Communications

s

Digitally Controlled Amplifiers and Attenuators

s

Portable Battery-Powered Instruments

s

Automatic Calibration for Manufacturing

s

Remote Industrial Devices

APPLICATIO S

FEATURES

DESCRIPTIO

BLOCK DIAGRA

CODE

0

256

512

768

1023

1661 G02

0.75

–0.75

0.60

0.40

0.20

0

–0.20

–0.40

–0.60