GENERAL DESCRIPTION
The AD9854 digital synthesizer is a highly integrated device that uses advanced DDS technology, coupled with two internal high speed, high performance quadrature DACs to form a digitally programmable I and Q synthesizer function. When referenced to an accurate clock source, the AD9854 generates highly stable, frequency-phase, amplitude-programmable sine and cosine outputs that can be used as an agile LO in communications, radar, and many other applications. The innovative high speed DDS core of the AD9854 provides 48-bit frequency resolution (1 μHz tuning resolution with 300 MHz SYSCLK). Maintaining 17 bits ensures excellent SFDR.

FEATURES
   300 MHz internal clock rate
   FSK, BPSK, PSK, chirp, AM operation
   Dual integrated 12-bit digital-to-analog converters (DACs)
   Ultrahigh speed comparator, 3 ps rms jitter
   Excellent dynamic performance 80 dB SFDR at 100 MHz (±1 MHz) AOUT
   4× to 20× programmable reference clock multiplier
   Dual 48-bit programmable frequency registers
   Dual 14-bit programmable phase offset registers
   12-bit programmable amplitude modulation and on/off output shaped keying function
   Single-pin FSK and BPSK data interfaces
   PSK capability via input/output interface
   Linear or nonlinear FM chirp functions with single-pin frequency hold function
   Frequency-ramped FSK
   <25 ps rms total jitter in clock generator mode
   Automatic bidirectional frequency sweeping
   Sin(x)/x correction
   Simplified control interfaces
      10 MHz serial 2- or 3-wire SPI compatible
      100 MHz parallel 8-bit programming
   3.3 V single supply
   Multiple power-down functions
   Single-ended or differential input reference clock
   Small, 80-lead LQFP or TQFP with exposed pad

APPLICATIONS
   Agile, quadrature LO frequency synthesis
   Programmable clock generators
   FM chirp source for radar and scanning systems
   Test and measurement equipment
   Commercial and amateur RF exciters