AD9851BRS

Product Summary

The AD9851BRS is a highly integrated device that uses advanced DDS technology, coupled with an internal high speed, high performance D/A converter, and comparator, to form a digitallyprogrammable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9851BRS 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 AD9851BRS 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 AD9851BRS contains a unique 6 REFCLK Multiplier circuit that eliminates the need for a high speed reference oscillator. The 6 REFCLK Multiplier has minimal impact on SFDR and phase noise characteristics. The AD9851BRS provides five bits of programmable phase modulation resolution to enable phase shifting of its output in increments of 11.25°.

Parametrics

AD9851BRS absolute maximum ratings: (1)Maximum Junction Temperature: +150℃; (2)Storage Temperature: -65℃ to +150℃; (3)VS: +6 V; (4)Operating Temperature: -40℃ to +85℃; (5)Digital Inputs: –0.7 V to +VS + 0.7 V; (6)Lead Temperature (10 sec) Soldering: +300℃; (7)Digital Output Current: 30 mA; (8)SSOP qJA Thermal Impedance: 82℃/W; (9)DAC Output Current: 30 mA.

Features

AD9851BRS features: (1)180 MHz Clock Rate with Selectable 63 Reference Clock Multiplier; (2)On-Chip High Performance 10-Bit DAC and High Speed Comparator with Hysteresis; (3)SFDR >43 dB @ 70 MHz AOUT; (4)32-Bit Frequency Tuning Word; (5)Simplified Control Interface: Parallel or Serial; (6)Asynchronous Loading Format; (7)5-Bit Phase Modulation and Offset Capability; (8)Comparator Jitter <80 ps p-p @ 20 MHz; (9)+2.7 V to +5.25 V Single Supply Operation; (10)Low Power: 555 mW @ 180 MHz; (11)Power-Down Function, 4 mW @ +2.7 V; (12)Ultrasmall 28-Lead SSOP Packaging.

Diagrams