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LTC2601/LTC2611/LTC2621

2601f

16-/14-/12-Bit Rail-to-Rail

DACs in 10-Lead DFN

The LTC

and 12-bit, 2.5V-to-5.5V rail-to-rail voltage output DACs

in a 10-lead DFN package. They have built-in high perfor-

mance output buffers and are guaranteed monotonic.

These parts establish new board-density benchmarks for

16- and 14-bit DACs and advance performance standards

for output drive, and load regulation in single-supply,

voltage-output multiples.

The parts use a simple SPI/MICROWIRE

3-wire serial interface which can be operated at clock rates

up to 50MHz. Daisy-chain capability, hardware CLR and

asynchronous DAC update (LDAC) pins are included.

The LTC2601/LTC2611/LTC2621 incorporate a power-on

reset circuit. During power-up, the voltage outputs rise

less than 10mV above zero scale; and after power-up, they

stay at zero scale until a valid write and update take place.

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Smallest Pin-Compatible Single DACs:

LTC2601: 16 Bits

LTC2611: 14 Bits

LTC2621: 12 Bits

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Guaranteed Monotonic Over Temperature

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Wide 2.5V to 5.5V Supply Range

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Low Power Operation: 300

µA at 3V

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Power Down to 1

µA, Max

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High Rail-to-Rail Output Drive (

±15mA, Min)

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Double-Buffered Data Latches

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Asynchronous DAC Update Pin

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Tiny (3mm

× 3mm) 10-Lead DFN Package

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Mobile Communications

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Process Control and Industrial Automation

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Instrumentation

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Automatic Test Equipment

Differential Nonlinearity (LTC2601)

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

MICROWIRE is a trademark of National Semiconductor Corporation.

U.S. patent number 5396245.

APPLICATIO S

FEATURES

DESCRIPTIO

BLOCK DIAGRA

7

10

1

DAC

REGISTER

INPUT

REGISTER

32-BIT

SHIFT

REGISTER

12-/14-/16-BIT DAC

CONTROL

DECODE

LOGIC

LDAC

SDO

2

SDI

SCK

5

CS/LD

9

6

REF

8

GND

2601 BD

4

CLR

3

CODE

0

16384

32768

49152

65535

2600 G02

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0