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 system clock inputs as low as 25 MHz.

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
 
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