®

DAC908

1

DAC908

DAC908

®

DAC908

PDS-1507B

Printed in U.S.A. April, 2000

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111

Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

For most current data sheet and other product

information, visit www.burr-brown.com

8-Bit, 165MSPS

DIGITAL-TO-ANALOG CONVERTER

FEATURES

q SINGLE +5V OR +3V OPERATION

q HIGH SFDR: 5.04MHz Output at 100MSPS: 67dBc

q LOW GLITCH: 3pV-s

q LOW POWER: 170mW at +5V

q INTERNAL REFERENCE:

Optional Ext. Reference

Adjustable Full-Scale Range

Multiplying Option

APPLICATIONS

q MEDICAL INSTRUMENTATION

Ultrasound (DBF)

q VIDEO, DIGITAL TV

q WAVEFORM GENERATION

Direct Digital Synthesis (DDS)

Arbitrary Waveform Generation (ARB)

q TEST INSTRUMENTATION

q COMMUNICATIONS

DESCRIPTION

The DAC908 is a high-speed, digital-to-analog converter (DAC)

offering an 8-bit resolution option within the SpeedPlus family

of high-performance converters. Featuring pin compatibility

among family members, the DAC900, DAC902, and DAC904

provide a component selection option to an 10-, 12-, and 14-bit

resolution, respectively. All models within this family of D/A

converters support update rates in excess of 165MSPS with

excellent dynamic performance, and are especially suited to

fulfill the demands of a variety of applications.

The advanced segmentation architecture of the DAC908 is

optimized to provide a high Spurious-Free Dynamic Range

(SFDR) for single-tone, as well as for multi-tone signals—

essential when used for the transmit signal path of communica-

tion systems.

The DAC908 has a high impedance (200k

Ω) current output with

a nominal range of 20mA and an output compliance of up to

1.25V. The differential outputs allow for both a differential, or

single-ended analog signal interface. The close matching of the

current outputs ensures superior dynamic performance in the

differential configuration, which can be implemented with a

transformer.

Utilizing a small geometry CMOS process, the monolithic

DAC908 can be operated on a wide, single-supply range of

+2.7V to +5.5V. Its low power consumption allows for use in

portable and battery operated systems. Further optimization can

be realized by lowering the output current with the adjustable

full-scale option.

For noncontinuous operation of the DAC908, a power-down

mode results in only 45mW of standby power.

The DAC908 comes with an integrated 1.24V bandgap refer-

ence and edge-triggered input latches, offering a complete

converter solution. Both +3V and +5V CMOS logic families

can be interfaced to the DAC908.

The reference structure of the DAC908 allows for additional

flexibility by utilizing the on-chip reference, or applying an

external reference. The full-scale output current can be adjusted

over a span of 2mA to 20mA, with one external resistor, while

maintaining the specified dynamic performance.

The DAC908 is available in the SO-28 and TSSOP-28 pack-

ages.

TM

Current

Sources

LSB

Switches

Segmented

Switches

+1.24V Ref.

Latches

8-Bit Data Input

D7...D0

DAC908

FSA

BW

AGND

CLK

DGND

INT/EXT

BYP

PD