GENERAL DESCRIPTION

The AD9858 is a direct digital synthesizer (DDS) featuring a 10-bit digital-to-analog converter (DAC) operating up to 1 GSPS. The AD9858 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 sine wave at up to 400 MHz.

FEATURES

1 GSPS internal clock speed

Up to 2 GHz input clock (selectable divide-by-2)

Integrated 10-bit DAC

Excellent phase noise and SFDR

32-bit programmable frequency register

Simplified 8-bit parallel and SPI serial control interface

Automatic frequency sweeping capability

4 frequency profiles

3.3 V power supply

Power dissipation: 2 W typical

Integrated programmable charge pump and phase frequency detector with fast lock circuit

Isolated charge pump supply up to 5 V

Integrated 2 GHz mixer

APPLICATIONS

VHF/UHF LO synthesis

Tuners

Instrumentation

Agile clock synthesis

Cellular base station hopping synthesizers

Radars

SONET/SDH clock synthesis