基于AD9952的芯片简介和应用电路设计

字数:14700,页数:42

摘要：简要介绍了AD9952芯片的功能、内部结构、引脚排列及典型的应用电路。AD9952芯片主要用于工作性能达到400MSPS的14位数/模转换的直接数字合成器的芯片。AD9952应用前沿DDS技术和一个内部高速、高性能的数模转换器形成数字可编程高频合成器能够产生一个频率高达200MHZ的模拟输出正弦波。可用来产生快速频率跳变和高分辨率（32位频率转换字）。频率转换和指令通过串行I/O口输入。

关键字：AD9952  性能  数/模转换器  直接数字合成器    封装

Abstract：It briefly introduced AD9952 function, internal structure, pin array and typical apply circuit. The AD9952 is a direct digital synthesizer (DDS) featuring a 14-bit DAC operating up to 400 MSPS. The AD9952 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 200 MHz. The AD9952 is designed to provide fast frequency hopping and fine tuning resolution (32-bit frequency tuning word). The frequency tuning and control words are loaded into the AD9952 via a serial I/O port.

Key word: AD9952  Features  DAC  Direct Digital Synthesizer  Package.

目   录

1．芯片简介 ..........................................................................1
1.1 特性............................................................................. 1
1.2 应用领域 .........................................................................1
2. AD9952芯片的电气特性 ..............................................................2
2.1 电气特性......................................................................... 2
2.2 极限范围 .........................................................................5
2.3 典型工作性能..................................................................... 6
3. AD9952芯片封装与引脚功能.......................................................... 9
3.1 芯片封装 .........................................................................9
3.2 引脚功能 ........................................................................11
4. AD9952内部结构与工作原理 .........................................................12
4.1 工作原理 ........................................................................12
4.1.1 DDS核 .........................................................................12
4.1.2 锁相环（PPL） .................................................................12
4.1.3 时钟输入 ......................................................................12
4.1.4 DAC输入 .......................................................................13
4.1.5 比较器........................................................................ 13
4.1.6 串行I/O口 .....................................................................13
4.1.7 寄存器表格及描述.............................................................. 14
4.1.8 控制寄存器位描述 ..............................................................15
4.1.9 其它寄存器描述 ................................................................17
4.2 工作模式 ........................................................................18
4.3 可编程AD9952芯片特性............................................................ 18
4.4 串行端口操作.................................................................... 22
4.5 指令字节 ........................................................................24
4.6 串行口引脚描述 ..................................................................24
4.7 MSB/LSB转换 .....................................................................24
5．应用电路设计 .....................................................................26
6．总结 .............................................................................28
参考文献............................................................................ 28