AD9850 CMOS、125 MHz完整DDS频率合成器

AD9850: CMOS、125 MHz完整DDS频率合成器

AD9850是一款高度集成的器件，采用先进的DDS技术，内置一个高速、高性能数模转换器和比较器，共同构成完整的数字可编程频率合成器和时钟发生器。以精密时钟源作为基准时，AD9850能产生频谱纯净的频率/相位可编程、模拟输出正弦波。该正弦波可以直接用作频率源，或转换为适合捷变时钟发生器应用的方波。AD9850的创新型高速DDS内核提供一个32位频率调谐字；对于125 MHz基准时钟输入，输出调谐分辨率可以达到0.0291 Hz。AD9850的电路架构允许产生最高达到基准时钟频率一半（或62.5 MHz）的输出频率，而且输出频率能以最高每秒2300万新频率的速率发生数字式改变（异步）。该器件还提供五位数字控制相位调制，使其输出能够以180°、90°、45°、22.5°、11.25°及其任意组合的增量发生相移。AD9850还内置一个高速比较器，它经过配置可以接受DAC的（外部）滤波输出，以产生低抖动方波输出，这样该器件便可用作捷变时钟发生器。

频率调谐、控制和相位调制字均以并行字节或串行加载格式载入AD9850。并行加载格式由一个8位控制字（字节）的五次迭代加载组成，第一个字节控制相位调制、省电使能和加载格式，第二至第五个字节组成32位频率调谐字。串行加载通过单个引脚上的40位串行数据流完成。AD9850完整DDS利用先进的CMOS技术提供这一突破性功能与性能，而功耗仅155 mW（+3.3 V电源）。AD9850采用节省空间的28引脚SSOP表面贴装封装，工作温度范围为–40°C至+85°C扩展工业温度范围。

The AD9850 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 complete digitally programmable frequency synthesizer and clock generator function. When referenced to an accurate clock source, the AD9850 generates a spectrally pure, frequency/ phase-programmable, analog output sine wave. This sine wave can be used directly as a frequency source or converted to a square wave for agile-clock generator applications. The AD9850’s innovative high speed DDS core provides a 32-bit frequency tuning word, which results in an output tuning resolution of 0.0291 Hz, for a 125 MHz reference clock input. The AD9850’s circuit architecture allows the generation of output frequencies of up to one-half the reference clock frequency (or 62.5 MHz), and the output frequency can be digitally changed (asynchronously) at a rate of up to 23 million new frequencies per second. The device also provides five 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. The AD9850 also contains a high speed comparator that can be configured to accept the (externally) filtered output of the DAC to generate a low jitter square wave output. This facilitates the device’s use as an agile clock generator function.

The frequency tuning, control, and phase modulation words are loaded into the AD9850 via a parallel byte or serial loading format. The parallel load format consists of five iterative loads of an 8-bit control word (byte). The first byte controls phase modulation, power-down enable, and loading format; bytes 2–5 comprise the 32-bit frequency tuning word. Serial loading is accomplished via a 40-bit serial data stream on a single pin. The AD9850 Complete-DDS uses advanced CMOS technology to provide this breakthrough level of functionality and performance on just 155 mW of power dissipation (+3.3 V supply).The AD9850 is available in a space saving 28-lead SSOP, surface mount package. It is specified to operate over the extended industrial temperature range of –40°C to +85°C

技术特性

125 MHz时钟速率
片内高性能DAC和高速比较器
DAC SFDR > 50 dB (40 MHz AOUT)
32位频率调谐字
简化的控制接口：并行字节或串行加载格式
相位调制能力
3.3 V或5 V单电源供电
低功耗：380 mW（125 MHz，5 V）155 mW（100 MHz，3.3 V）
省电功能
超小型28引脚SSOP封装

125 MHz Clock Rate
On-Chip High Performance DAC and High Speed Comparator
DAC SFDR > 50 dB @ 40 MHz AOUT
32-Bit Frequency Tuning Word
Simplified Control Interface: Parallel Byte or Serial Loading Format
Phase Modulation Capability
3.3 V or 5 V Single-Supply Operation
Low Power: 380 mW @ 125 MHz (5 V) 155 mW @ 100 MHz (3.3 V)
Power-Down Function
Ultrasmall 28-Lead SSOP Packaging

技术指标

Master fclk : 125MHz
Resolution (Bits): 10bit
Tuning Word Width (bits): 32bit
I/O Interface: Parallel,Serial
REFCLK Multiplier: No
Compliance Range (V): 1.5V
FS Iout (mA nom): 20mA

功能框图

订购指南

产品型号	封装	引脚	温度范围	包装和数量	报价*(100-499)	报价*1000 pcs	RoHS
AD9850BRS 产品状态: 量产	28 ld SSOP	28	工业	Tube, 47	$ 17.01	$ 14.03	N 材料信息
AD9850BRS-REEL 产品状态: 量产	28 ld SSOP	28	工业	Reel, 1500	$ 0.00	$ 14.03	N 材料信息
AD9850BRSZ 产品状态: 量产	28 ld SSOP	28	工业	Tube, 47	$ 14.72	$ 12.14	Y 材料信息
AD9850BRSZ-REEL 产品状态: 量产	28 ld SSOP	28	工业	Reel, 1500	$ 0.00	$ 12.14	Y 材料信息