AD9851BRSZ

Product Summary

The AD9851 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 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 an 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 AD9851 provides five bits of programmable phase modulation resolution to enable phase shifting of its output in increments of 11.25°.

Parametrics

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 θJA Thermal Impedance :82℃/W
9. DAC Output Current :30 mA

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 Asynchronous Loading Format
6. 5-Bit Phase Modulation and Offset Capability
7. Comparator Jitter <80 ps p-p @ 20 MHz
8. +2.7 V to +5.25 V Single Supply Operation
9. Low Power: 555 mW @ 180 MHz
10. Power-Down Function, 4 mW @ +2.7 V
11. Ultrasmall 28-Lead SSOP Packaging

Diagrams