Catalog
400 MSPS, 14-Bit, 1.8 V CMOS, Direct Digital Synthesizer
Key Features
• 400 MSPS internal clock speed
• Integrated 14-bit DAC
• Programmable phase/amplitude dithering
• 32-bit frequency tuning accuracy 14-bit phase tuning accuracy
• Phase noise better than –120 dBc/Hz
• Excellent dynamic performance
• >80 dB narrowband SFDR
• Serial input/output (I/O) control
• Ultrahigh speed analog comparator
• Automatic linear and nonlinear frequency sweeping
• 4 frequency/phase offset profiles
• 1.8 V power supply
• Software and hardware controlled power-down
• 48-lead TQFP Integrated 1024 word × 32-bit RAM
• PLL-based REFCLK multiplier
• Internal oscillator, can be driven by a single crystal
• Phase modulation capability
• Multichip synchronization
Description
AI
The AD9954 is a direct digital synthesizer (DDS) that uses advanced technology, coupled with an internal high speed, high performance DAC to form a complete, digitally programmable, high frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 160 MHz. The AD9954 enables fast frequency hopping coupled with fine tuning of both frequency (0.01 Hz or better) and phase (0.022° granularity).The AD9954 is programmed via a high speed serial I/O port. The device includes static RAM to support flexible frequency sweep capability in several modes, plus a user-defined linear sweep mode of operation. Also included is an on-chip high speed comparator for applications requiring a square wave output. An on-chip oscillator and PLL circuitry provide users with multiple approaches to generate the device’s system clock.The AD9954 is specified to operate over the extended industrial temperature range.ApplicationsAgile LO frequency synthesisProgrammable clock generatorsFM chirp source for radar and scanning systemsAutomotive radarsTest and measurement equipmentAcousto-optic device drivers
