12-Bit 300 MSPS High-Speed TxDAC+ D/A Converter
FEATURES 12-Bit Dual Muxed Port DAC 300 MSPS Output Update Rate Excellent SFDR and IMD Performance SFDR to Nyquist @ 25 ...
Description
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...
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