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LTC1662

Ultralow Power, Dual

10-Bit DAC in MSOP

The LTC

age output, dual 10-bit digital-to-analog converter (DAC).

Each DAC channel draws just 1.7

µA (typ) total supply-

plus-reference operating current, yet is capable of sup-

plying DC output currents in excess of 1mA and reliably

driving capacitive loads of up to 1000pF. A program-

mable Sleep mode further reduces total operating cur-

rent to 0.05

µA.

Linear Technology’s proprietary, inherently monotonic

architecture provides excellent linearity and an exception-

ally small external form factor. The double-buffered input

logic provides simultaneous update capability and can be

used to write to the DACs without interrupting Sleep mode.

With its tiny operating current and exceptionally small

size, the LTC1662 is ideal for use in the most power-

constrained products. For most designs, there is no

perceptible impact on the power budget; the LTC1662

draws many times less current than even a trimpot, while

providing buffered, low impedance (0.5

Ω typical,

The LTC1662 is pin and software compatible with the

LTC1661 dual, 60

µA 10-bit DAC. It is available in 8-pin

MSOP and PDIP packages and is specified over the

industrial temperature range.

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Ultralow Power: 1.5

0.05

µA Sleep Mode for Extended Battery Life

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

Half the Size of an SO-8

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Wide 2.7V to 5.5V Supply Range

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Double Buffered for Simultaneous DAC Updates

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Rail-to-Rail Voltage Outputs Drive 1000pF

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Reference Range Includes Supply for Ratiometric

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Reference Input Impedance Is Code-Independent

(7.1M

Ω Typ)—Eliminates External Buffers

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3-Wire Serial Interface with

Schmitt Trigger Inputs

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Differential Nonlinearity:

±0.75LSB Max

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

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Mobile Communications

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Portable Battery-Powered Instruments

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Remote or Inaccessible Adjustments

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Digitally Controlled Amplifiers and Attenuators

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Factory or Field Calibration

CS/LD

1662 BD

1

4

10-BIT

DAC A

10-BIT

DAC B

ADDRESS

DECODER

CONTROL

LOGIC

SHIFT REGISTER

SDI

REF

3

8

5

GND

7

6

SCK

2

APPLICATIO S

FEATURES

DESCRIPTIO

BLOCK DIAGRA

TEMPERATURE (

°C)

–55 –35 –15

5

25

45

65

85 105 125

1662 G02

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

CODE = 1023

5.5V

4.5V

3.6V

Total Supply-Plus-Reference

Operating Current