400 MSPS/ 10-Bit/ 1.8 V CMOS Direct Digital Synthesizer
400 MSPS, 10-Bit, 1.8 V CMOS Direct Digital Synthesizer AD9859
FEATURES
400 MSPS internal clock speed Integrated 10-bit ...
Description
400 MSPS, 10-Bit, 1.8 V CMOS Direct Digital Synthesizer AD9859
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
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. The AD9859 is specified to operate over the extended industrial temperature range of –40°C to +105°C
FUNCTIONAL BLOCK DIAGRAM
DDS CORE PHASE ACCUMULATOR Z–1 PHASE OFFSET 32 19 COS(X) 10 DAC
AD9859...
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