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