基于400MSPS 14-Bit,1.8VCMOS直接数字合成器AD9951

字数:15000,页数:32

摘要:
AD9951是一个直接数字频率合成器（DDS），其特色是有一个工作在400MSPS的14位数/模转换器（14-bit DAC）. AD9951采用了先进的DDS技术,芯片内部有一个高速的，高性能的DAC，能够形成一个数位可编程的，完整的高频合成器DDS系统，有能力产生频率达200 MHz的模拟正弦波。AD9951可提供快速频率跳变和高精度分辩率（32位频率控制字）。频率调谐和控制字经并行口或串行口输入到AD9951。
在工业应用中，AD9951的工作温度为–40°C到+105°C。同时并联发生AD9951,存在三种可能得到的同步方式电路∶自动同步方式,软件控制手控同步方式，硬件控制手控同步方式。AD9951可以应用于本机振荡频率合成,可编程时钟发生器,测试和测量装置,声光器件驱动装置。AD9951在不同的时钟脉冲下有不同的操作方法。适合于差动或单端输入时钟脉冲并启动芯片内部振荡器及锁相环路（锁相环）放大器全部控制经由用户可编程序的位。
关键字: 自动同步方式            软件控制手控同步方式                        硬件控制手控同步方式           差动输入时钟脉冲
共模噪声                          信噪比

Abstract:
 The AD9951 is a direct digital synthesizer (DDS) featuring a 14-bit DAC operating up to 400 MSPS. The AD9951 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 AD9951 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 AD9951 via a serial I/O port. The AD9951 is specified to operate over the extended industrial temperature range of –40°C to +105°C. Synchronizing Multiple AD9951s , The AD9951 product allows easy synchronization of multiple AD9951s. There are three modes of synchronization available to the user: an automatic synchronization mode, a software controlled manual synchronization mode, and a hardware controlled manual synchronization mode. Applications, Agile LO frequency synthesis, Programmable clock generators, Test and measurement equipment ,Acousto-optic device drivers. The AD9951 supports various clock methodologies. Support for differential or single-ended input clocks and enabling of an on-chip oscillator and/or a phase-locked loop (PLL) multiplier are all controlled via user programmable bits.

Key words: automatic synchronization mode                            software controlled manual synchronization mode                                  a hardware controlled manual synchronization mode
Support for differential input clocks
Common-mode noise             increased signal-to-noise ratio

目录
芯片简介................................................................5
AD9951的主要电气特征....................................................5
绝对最大额定值..........................................................9
AD9951的芯片封装与引脚功能..............................................9
1引脚封装形式...........................................................9
4.  2引脚功能描述......................................................10
内部结构与工作原理.....................................................12
5. 1典型工作动态特征...................................................12
5. 2工作原理...........................................................17
5. 3工作模式...........................................................22
5. 4AD9951的编程.......................................................22
5. 5串行端口...........................................................26
5. 6指令字节...........................................................27
5. 7串行接口引脚描述...................................................28
5. 8最高有效位／最小有效位转接.........................................28
6.  应用电路...........................................................29
7.  封装尺寸...........................................................31
8.  注意ESD............................................................31
规则手册...............................................................31
设计总结...............................................................32

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