THS5661

12-BIT, 100 MSPS, CommsDAC

™

DIGITAL-TO-ANALOG CONVERTER

SLAS200A – MAY 1999 – REVISED JULY 1999

1

POST OFFICE BOX 655303

CommsDAC

™ Product Family

Nyquist at 20 MHz Output: 63 dBc

to 20 mA

Interface

Mode: 25 mW at 5 V

description

The THS5661 is a 12-bit resolution digital-to-analog converter (DAC) specifically optimized for digital data

transmission in wired and wireless communication systems. The 12-bit DAC is a member of the CommsDAC

series of high-speed, low-power CMOS digital-to-analog converters. The CommsDAC family consists of pin

compatible 14-, 12-, 10-, and 8-bit DACs. All devices offer identical interface options, small outline package, and

pinout. The THS5661 offers superior ac and dc performance while supporting update rates up to 100 MSPS.

The THS5661 operates from an analog supply of 4.5 V to 5.5 V. Its inherent low power dissipation of 175 mW

ensures that the device is well-suited for portable and low-power applications. Lowering the full-scale current

output reduces the power dissipation without significantly degrading performance. The device features a

SLEEP mode, which reduces the standby power to approximately 25 mW, thereby optimizing the power

consumption for system needs.

The THS5661 is manufactured in Texas Instruments advanced high-speed mixed-signal CMOS process. A

current-source-array architecture combined with simultaneous switching shows excellent dynamic

performance. On-chip edge-triggered input latches and a 1.2 V temperature-compensated bandgap reference

provide a complete monolithic DAC solution. The digital supply range of 3 V to 5.5 V supports 3 V and 5 V CMOS

logic families. Minimum data input setup and hold times allow for easy interfacing with external logic. The

THS5661 supports both a straight binary and twos complement input word format, enabling flexible interfacing

with digital signal processors.

The THS5661 provides a nominal full-scale differential output current of 20 mA and >300 k

Ω output impedance,

supporting both single-ended and differential applications. The output current can be directly fed to the load

(e.g., external resistor load or transformer), with no additional external output buffer required. An accurate

on-chip reference and control amplifier allows the user to adjust this output current from 20 mA down to 2 mA,

with no significant degradation of performance. This reduces power consumption and provides 20 dB gain range

control capabilities. Alternatively, an external reference voltage and control amplifier may be applied in

applications using a multiplying DAC. The output voltage compliance range is 1.25 V.

Copyright

© 1999, Texas Instruments Incorporated

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.

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.

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D11

D10

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D2

D1

D0

NC

NC

CLK

DGND

MODE

COMP2

IOUT1

IOUT2

AGND

COMP1

BIASJ

EXTIO

EXTLO

SLEEP

SOIC (DW) OR TSSOP (PW) PACKAGE

(TOP VIEW)

NC – No internal connection

CommsDAC is a trademark of Texas Instruments Incorporated.