REV. 0

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a

AD5544/AD5554

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

Quad, Current-Output

Serial-Input, 16-Bit/14-Bit DACs

FUNCTIONAL BLOCK DIAGRAM

INPUT

REGISTER R

16

DAC A

REGISTER R

2:4

DECODE

DAC A

B

C

D

POWER-

ON

RESET

D0

D1

D2

D3

D4

D5

D6

D7

D8

D9

D10

D11

D12

D13

D14

D15

A0

A1

DAC B

DAC C

DAC D

DAC A

EN

LDAC

MSB

RS

DGND

CLK

CS

SDI

SDO

AD5544

INPUT

REGISTER R

INPUT

REGISTER R

INPUT

REGISTER R

DAC B

REGISTER R

DAC C

REGISTER R

DAC D

REGISTER R

FEATURES

AD5544 16-Bit Resolution

AD5554 14-Bit Resolution

2 mA Full-Scale Current

10 V

2

s Settling Time

Midscale or Zero-Scale Reset

Four Separate 4Q Multiplying Reference Inputs

SPI-Compatible 3-Wire Interface

Double Buffered Registers Enable

Simultaneous Multichannel Change

Internal Power ON Reset

Compact SSOP-28 Package

APPLICATIONS

Automatic Test Equipment

Instrumentation

Digitally-Controlled Calibration

GENERAL DESCRIPTION

The AD5544/AD5554 quad, 16-/14-bit, current-output, digital-

to-analog converters are designed to operate from a single 5 V

supply.

provide temperature-tracking, full-scale voltage outputs when

combined with an external I-to-V precision amplifier.

A doubled-buffered serial-data interface offers high-speed,

3-wire, SPI- and microcontroller-compatible inputs using

serial-data-in (SDI), clock (CLK), and a chip-select (

CS). In

addition, a serial-data-out pin (SDO) allows for daisy-chaining

when multiple packages are used. A common level-sensitive

load-DAC strobe (

LDAC) input allows simultaneous update of

all DAC outputs from previously loaded input registers. Addi-

tionally, an internal power ON reset forces the output voltage to

zero at system turn ON. An MSB pin allows system reset asser-

tion (

RS) to force all registers to zero code when MSB = 0, or

to half-scale code when MSB = 1.

AD5544/AD5554 are packaged in the compact SSOP-28.

57344

49152

40960

32768

24576

16384

8192

0

65536

CODE – Decimal

1.0

0.5

0.0

–0.5

–1.0

1.0

0.5

0.0

–0.5

–1.0

1.0

0.5

0.0

–0.5

–1.0

1.0

0.5

0.0

–0.5

–1.0

DAC A

DAC B

DAC C

DAC D

°C)