GENERAL DESCRIPTION

The AD9859 is a direct digital synthesizer (DDS) featuring a 10-bit DAC operating at up to 400 MSPS. The AD9859 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 200 MHz. The AD9859 is designed to provide fast frequency hopping and fine tuning resolution (32-bit frequency tuning word). The frequency tuning and control words are loaded into the AD9859 via a serial I/O port.

FEATURES

400 MSPS internal clock speed

Integrated 10-bit DAC

32-bit tuning word

Phase noise ≤ –120 dBc/Hz @ 1 kHz offset (DAC output)

Excellent dynamic performance

>75 dB SFDR @ 160 MHz (±100 kHz offset) AOUT

Serial I/O control

1.8 V power supply

Software and hardware controlled power-down

48-lead TQFP/EP package

Support for 5 V input levels on most digital inputs

PLL REFCLK multiplier (4× to 20×)

Internal oscillator; can be driven by a single crystal

Phase modulation capability

Multichip synchronization

APPLICATIONS

Agile LO frequency synthesis

Programmable clock generators

Test and measurement equipment

Commercial and amateur radio exciter