AD9912

Data Sheet AD9912 1 GSPS Direct Digital Synthesizer with 14-Bit DAC FEATURES ► 1 GSPS internal clock speed (up to 400 MHz output directly) ► Integrated 1 GSPS 14-bit DAC ► 48-bit frequency tuning word with 4 µHz resolution ► Differential HSTL comparator ► Flexible system clock input accepts either crystal or external reference clock ► On-chip low noise PLL REFCLK multiplier ► 2 SpurKiller channels ► Low jitter clock doubler for frequencies up to 750 MHz ► Single-ended CMOS comparator; frequencies of <150 MHz ► Programmable output divider for CMOS output ► Serial I/O control ► Excellent dynamic performance ► Software controlled power-down ► Available in two 64-lead LFCSP packages ► Residual phase noise @ 250 MHz ► 10 Hz offset: −113 dBc/Hz ► 1 kHz offset: −133 dBc/Hz ► 100 kHz offset: −153 dBc/Hz ► 40 MHz offset: −161 dBc/Hz BASIC BLOCK DIAGRAM APPLICATIONS ► Agile LO frequency synthesis ► Low jitter, fine tune clock generation ► Test and measurement equipment ► Wireless base stations and controllers ► Secure communications ► Fast frequency hopping GENERAL DESCRIPTION The AD9912 is a direct digital synthesizer (DDS) that features an integrated 14-bit digital-to-analog converter (DAC). The AD9912 features a 48-bit frequency tuning word (FTW) that can synthesize frequencies in step sizes no larger than 4 μHz. Absolute frequency accuracy can be achieved by adjusting the DAC system clock. The AD9912 also features an integrated system clock phase-locked loop (PLL) that allows for...