LTC1661

1

1661fa

BLOCK DIAGRAM

FEATURES

DESCRIPTION

Micropower Dual

10-Bit DAC in MSOP

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

tiny MS8 package. Each buffered DAC draws just 60µA

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 reduces total

supply current to a negligible 1µA.

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.

Differential Nonlinearity (DNL)

APPLICATIONS

n

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

Half the Board Space of an SO-8

n

Micropower: 60µA per DAC

Sleep Mode: 1µA for Extended Battery Life

n

Rail-to-Rail Voltage Outputs Drive 1000pF

n

Wide 2.7V to 5.5V Supply Range

n

Double Buffered for Independent or Simultaneous

DAC Updates

n

Reference Range Includes Supply for Ratiometric

n

Reference Input Has Constant Impedance over All

Codes (260kΩ Typ)—Eliminates External Buffers

n

3-Wire Serial Interface with Schmitt Trigger Inputs

n

Differential Nonlinearity: ≤±0.75LSB Max

n

Mobile Communications

n

Digitally Controlled Amplifiers and Attenuators

n

Portable Battery-Powered Instruments

n

Automatic Calibration for Manufacturing

n

Remote Industrial Devices

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

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

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