GENERAL DESCRIPTION

The AD9851 is a highly integrated device that uses advanced DDS technology, coupled with an internal high speed, high performance D/A converter, and comparator, to form a digitally programmable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9851 generates a stable frequency and phase-programmable digitized analog output sine wave.

FEATURES

180 MHz Clock Rate with Selectable 6Reference Clock Multiplier

On-Chip High Performance 10-Bit DAC and High Speed Comparator with Hysteresis

SFDR >43 dB @ 70 MHz AOUT

32-Bit FrequencyTuning Word

Simplifi ed Control Interface: Parallel or Serial Asynchronous Loading Format

5-Bit Phase Modulation and Offset Capability

Comparator Jitter <80 ps p-p @ 20 MHz

2.7 V to 5.25 V Single-Supply Operation

Low Power:555 mW @ 180 MHz

Power-Down Function,4 mW @ 2.7 V

Ultrasmall 28-Lead SSOP Packaging

APPLICATIONS

Frequency/Phase-Agile Sine Wave Synthesis

Clock Recovery and Locking Circuitry for Digital Communications

Digitally Controlled ADC Encode Generator

Agile Local Oscillator Applications in Communications

Quadrature Oscillator

CW, AM, FM, FSK, MSK Mode Transmitter