GENERAL DESCRIPTION

The AD9742 is a 12-bit resolution, wideband, third generation member of the TxDAC series of high performance, low power CMOS digital-to-analog converters (DACs). The TxDAC family, consisting of pin-compatible 8-, 10-, 12-, and 14-bit DACs, is specifically optimized for the transmit signal path of communication systems. All of the devices share the same interface options, small outline package, and pinout, providing an upward or downward component selection path based on performance, resolution, and cost. The AD9742 offers exceptional ac and dc performance while supporting update rates up to 210 MSPS.

FEATURES

High performance member of pin-compatible TxDAC

product family

Excellent spurious-free dynamic range performance

SNR at 5 MHz output, 125 MSPS: 70 dB

Twos complement or straight binary data format

Differential current outputs: 2 mA to 20 mA

Power dissipation: 135 mW at 3.3 V

Power-down mode: 15 mW at 3.3 V

On-chip 1.2 V Reference

CMOS compatible digital interface

28-lead SOIC, 28-lead TSSOP, and 32-lead LFCSP

Edge-triggered latches

APPLICATIONS

Wideband communication transmit channel:

Direct IF

Base stations

Wireless local loops

Digital radio links

Direct digital synthesis (DDS)

Instrumentation

DC SPECIFICATIONS

TMIN to TMAX, AVDD = 3.3 V, DVDD = 3.3 V, CLKVDD = 3.3 V, IOUTFS = 20 mA, unless otherwise noted.