GENERAL DESCRIPTION

The AD9914 is a direct digital synthesizer (DDS) featuring a 12-bit DAC. The AD9914 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 1.4 GHz. The AD9914 enables fast frequency hopping and fine tuning resolution (64-bit capable using programmable modulus mode). The AD9914 also offers fast phase and amplitude hopping capability.

The frequency tuning and control words are loaded into the AD9914 via a serial or parallel I/O port. The AD9914 also supports a user defined linear sweep mode of operation for generating linear swept waveforms of frequency, phase, or amplitude. A high speed, 32-bit parallel data input port is included, enabling high data rates for polar modulation schemes and fast reprogramming of the phase, frequency, and amplitude tuning words.

The AD9914 is specified to operate over the extended industrial temperature range (see the Absolute Maximum Ratings section).

FEATURES

  3.5 GSPS internal clock speed

  Integrated 12-bit DAC

  Frequency tuning resolution to 190 pHz

  16-bit phase tuning resolution

  12-bit amplitude scaling

  Programmable modulus

  Automatic linear and nonlinear frequency sweeping capability

  32-bit parallel datapath interface

  8 frequency/phase offset profiles

  Phase noise: −128 dBc/Hz (1 kHz offset at 1396 MHz)

  Wideband SFDR < −50 dBc

  Serial or parallel I/O control

  1.8 V/3.3 V power supplies

  Software and hardware controlled power-down

  88-lead LFCSP package

  PLL REF CLK multiplier

  Phase modulation capability

  Amplitude modulation capability

APPLICATIONS

  Agile LO frequency synthesis

  Programmable clock generator

  FM chirp source for radar and scanning systems

  Test and measurement equipment

  Acousto-optic device drivers

  Polar modulator

  Fast frequency hopping