AD9851 Datasheet | Analog Devices

FEATURES 180 MHz Clock Rate with Selectable 6 Reference Clock Multiplier On-Chip High Performance 10-Bit DAC and High Speed parator with Hysteresis SFDR >43 d B @ 70 MHz AOUT 32-Bit Frequency Tuning Word Simplified Control Interface: Parallel or Serial Asynchronous Loading Format 5-Bit Phase Modulation and Offset Capability parator Jitter <80 ps p-p @ 20 MHz 2.7 V to 5.25 V Single-Supply Operation Low Power: 555 m W @ 180 MHz Power-Down Function, 4 m W @ 2.7 V Ultrasmall 28-Lead SSOP Packaging APPLICATIONS Frequency/Phase-Agile Sine Wave Synthesis Clock Recovery and Locking Circuitry for Digital munications Digitally Controlled ADC Encode Generator Agile Local Oscillator Applications in munications Quadrature Oscillator CW, AM, FM, FSK, MSK Mode Transmitter CMOS 180 MHz DDS/DAC Synthesizer FUNCTIONAL BLOCK DIAGRAM +VS GND REF CLOCK IN MASTER RESET FREQUENCY UPDATE/DATA REGISTER RESET WORD LOAD CLOCK 6 REFCLK MULTIPLIER HIGH SPEED DDS 32-BIT TUNING WORD PHASE AND CONTROL WORDS FREQUENCY/PHASE DATA REGISTER DATA INPUT REGISTER SERIAL LOAD PARALLEL LOAD 10-BIT DAC PARATOR DAC RSET ANALOG OUT ANALOG IN CLOCK OUT CLOCK OUT 1 BIT  40 LOADS 8 BITS  5 LOADS FREQUENCY, PHASE AND CONTROL DATA INPUT 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 parator, 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. This sine wave can be used directly as a frequency source, or internally converted to a square wave for agile-clock generator applications. The AD9851’s innovative high speed DDS core accepts a 32-bit frequency tuning word, which results in an output tuning resolution of approximately 0.04 Hz with a 180 MHz system clock. The AD9851 contains a unique...