AD9851: 180 MHz Complete DDS synthesizer

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 sinewave. This sinewave 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 provides a 32-bit frequency tuning word, which results in an output tuning resolution of 40 milli-Hertz, for a 180 MHz reference clock. The AD9851 contains a unique X6 reference clock multiplier circuit that obviates the need for a high-speed reference oscillator. The 6X PLL multiplier has minimal impact on SFDR and phase noise characteristics. The device provides 5-bits of digitally-controlled phase modulation which enables phase shifting of its output in increments of 180°, 90°, 45°, 22.5°, 11.25°, and any combination thereof.

AD9851 特点

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

AD9851 功能框图

AD9851 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
AD9851/CGPCB	量产	评估板	-	商业
AD9851/FSPCB	量产	评估板	-	商业
AD9851BRS	量产	28 ld SSOP	28	商业
AD9851BRSRL	量产	28 ld SSOP	28	商业
AD9851BRSZ	量产	28 ld SSOP	28	商业
AD9851BRSZRL	量产	28 ld SSOP	28	商业

AD9851 应用技术支持与电子电路设计开发资源下载

1. AD9851 数据手册DataSheet 下载 . PDF
2. ADI 模拟器件公司比较器产品选型指南 . PDF
3. Analog Devices, Inc. 美国模拟器件公司产品订购手册 .PDF