AD9753

FEATURES 12-Bit Dual Muxed Port DAC 300 MSPS Output Update Rate Excellent SFDR and IMD Performance SFDR to Nyquist @ 25 MHz Output: 69 dB Internal Clock Doubling PLL Differential or Single-Ended Clock Input On-Chip 1.2 V Reference Single 3.3 V Supply Operation Power Dissipation: 155 mW @ 3.3 V 48-Lead LQFP APPLICATIONS Communications: LMDS, LMCS, MMDS Base Stations Digital Synthesis QAM and OFDM 12-Bit, 300 MSPS High Speed TxDAC+®D/A Converter AD9753* FUNCTIONAL BLOCK DIAGRAM DVDD DCOM AVDD ACOM DAC LATCH PORT1 LATCH PORT2 LATCH MUX DAC IOUTA IOUTB CLK+ CLK– CLKVDD PLLVDD CLKCOM PLL CLOCK MULTIPLIER REFERENCE AD9753 RESET LPF DIV0 DIV1 PLLLOCK REFIO FSADJ GENERAL DESCRIPTION The AD9753 is a dual, muxed port, ultrahigh speed, singlechannel, 12-bit CMOS DAC. It integrates a high quality 12-bit TxDAC+ core, a voltage reference, and digital interface circuitry into a small 48-lead LQFP package. The AD9753 offers exceptional ac and dc performance while supporting update rates up to 300 MSPS. The AD9753 has been optimized for ultrahigh speed applications up to 300 MSPS where data rates exceed those possible on a single data interface port DAC. The digital interface consists of two buffered latches as well as control logic. These latches can be time multiplexed to the high speed DAC in several ways. This PLL drives the DAC latch at twice the speed of the externally applied clock and is able to interleave the data from the two input channels. The resulting output da...