DAC

900

DAC900

10-Bit, 165MSPS

DIGITAL-TO-ANALOG CONVERTER

FEATURES

q SINGLE +5V OR +3V OPERATION

q HIGH SFDR: 5MHz Output at 100MSPS: 68dBc

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 COMMUNICATION TRANSMIT CHANNELS

WLL, Cellular Base Station

Digital Microwave Links

Cable Modems

q WAVEFORM GENERATION

Direct Digital Synthesis (DDS)

Arbitrary Waveform Generation (ARB)

q MEDICAL/ULTRASOUND

q HIGH-SPEED INSTRUMENTATION AND CON-

TROL

q VIDEO, DIGITAL TV

DESCRIPTION

The DAC900 is a high-speed, Digital-to-Analog Converter (DAC)

offering a 10-bit resolution option within the SpeedPlus family of

high-performance converters. Featuring pin compatibility among

family members, the DAC908, DAC902, and DAC904 provide a

component selection option to an 8-, 12-, and 14-bit resolution,

respectively. All models within this family of DACs 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 DAC900 is opti-

mized 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 communication systems.

The DAC900 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 DAC900

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 DAC900, a power-down mode

results in only 45mW of standby power.

The DAC900 comes with an integrated 1.24V bandgap reference

and edge-triggered input latches, offering a complete converter

solution. Both +3V and +5V CMOS logic families can be inter-

faced to the DAC900.

The reference structure of the DAC900 allows for additional

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

nal reference. The full-scale output current can be adjusted over a

span of 2mA to 20mA, with one external resistor, while maintain-

ing the specified dynamic performance.

The DAC900 is available in SO-28 and TSSOP-28 packages.

Current

Sources

LSB

Switches

Segmented

Switches

+1.24V Ref.

Latches

10-Bit Data Input

D9...D0

DAC900

FSA

BW

+VD

+VA

AGND

CLK

DGND

REFIN

INT/EXT

IOUT

IOUT

BYP

PD

DAC900

SBAS093B – MAY 2002

www.ti.com

Copyright © 2002, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TM

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.