字数:10860,页数:37

摘要
简要介绍LMX2310U/LMX2311U/LMX2312U/LMX2313U高性能频率合成器芯片的功能、内部结构、引脚排列及典型的应用电路。LMX2310/1/2 U 集成的是可选择双模数32/33 和 16/17的前置分频器。 LMX2313U集成的是可选择双模数16/17 和 8/9 的前置分频器。该器件当一个高品质的基准振荡器和一个压控振荡器组合时，就能产生一个高稳定度、噪音极低的本地振荡信号，在无线通信中用于上/下变频。通过一个三线串行口（DATA、ENABLE和CLOCK）串行数据能传入到LMX2310/1/2/3U，能直接与低压基带处理器连接。LMX2310/1/2/3U的电源电压均为 2.7V ～5.5V。
关键字：前置分频器  反馈分频器 
 低功耗   锁相环路  快速跟踪输出

Abstract
It briefly introduced The LMX2310/1/2/3U high performance frequency synthesizers’s
microcontroller function, internal structure, pin array and typical apply circuit. The LMX2310/1/2U use a selectable, dual modulus 32/33 and 16/17 prescaler. The LMX2313U uses a selectable,dual modulus 16/17 and 8/9 prescaler. The device,when combined with a high quality reference oscillator and a voltage controlled oscillator, generates very stable, low noise local oscillator signals for up and down conversion in wireless communication devices.
Serial data is transferred into LMX2310/1/2/3U via a threewire interface (Data, Enable, Clock) that can be directly interfaced with low voltage baseband processors. Supply voltage can range from 2.7V to 5.5V.

Key word:  reference divider   Feedback divider
            Power-Down    PPL       Fastlock  OUTPUT

目 录

1. LMX2310/1/2/3U芯片简介------------------------------------------------------------4
2. LMX2310/1/2/3U芯片封装与引脚功能--------------------------------------------------4
3. LMX2310/1/2/3U主要电气特性--------------------------------------------------------8
4. LMX2310/1/2/3U内部结构与工作原理  --------------------------------------------24
4．1  基准振荡器--------------------------------------------------------------------28
4．2  基准分频器--------------------------------------------------------------------28
4．3  RF前置分频器------------------------------------------------------------------28
4．4  可编程的反馈分频器------------------------------------------------------------28
4．5  相位/频率检波器---------------------------------------------------------------28
4．6  充电泵------------------------------------------------------------------------28
4．7  串行接口----------------------------------------------------------------------29
4．8  多功能输出--------------------------------------------------------------------29
4．8．1 模拟锁相--------------------------------------------------------------------29
4．8．2 数字锁相--------------------------------------------------------------------29
4．9  快速跟踪输出------------------------------------------------------------------31
4．10 低功耗模式-------------------------------------------------------------------31
5. LMX2310/1/2/3U应用电路设计-------------------------------------------------------32
5．1  串行接口设计------------------------------------------------------------------32
5．2  R寄存器-----------------------------------------------------------------------32
5．2．1 基准分频器------------------------------------------------------------------33
5．2．2 相位检波器的极性------------------------------------------------------------33
5．2．3 充电泵输出电流--------------------------------------------------------------33
5．2．4 充电泵三态输出--------------------------------------------------------------33
5．2．5 FoLD脚输出真值表------------------------------------------------------------34
5．3  N寄存器-----------------------------------------------------------------------34
5．3．1 低功耗控制------------------------------------------------------------------34
5．3．2 前置分频器------------------------------------------------------------------34
5．3．3 B计数器---------------------------------------------------------------------35
5．3．4 A计数器---------------------------------------------------------------------35
5．4  T寄存器-----------------------------------------------------------------------35
5．4．1  FoLD输出-------------------------------------------------------------------36
5．4．2  超时计数器-----------------------------------------------------------------36
6. 总结-----------------------------------------------------------------------------37
参考文献----------------------------------------------------------------------------37

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