基于 MAX2450芯片简介及应用电路设计

字数:4270,页数:14

摘要

简要介绍MAX24503V、超低功率、正交调制器/解调器的功能、内部结构、引脚排列及典型的应用电路。MAX2450是一个单片机正交解调器集成电路，芯片内部包含了完整的正交移相器，具有本机振荡和8分频前置分频器。它工作基于一个单一的+3V补偿电源电压和只有5.9mA的相对电流。MAX2450解调器能够接收35~80MHZ频率范围内的中频信号，具有51dB电压转换增益，并且能够将信号解调为I/Q基带信号。MAX2450常用于无线数字电话、GSM和北美蜂窝式电话、无线局域网、双道寻呼机。

关键字：调制器   解调器
基带信号 中频信号

Abstract

It briefly introduced the MAX2450 3V,Uitra-Low-Power Quadrature Modulator/Demodulato. function, internal structure, pin array and typical apply circuit. The MAX2450 combines a quadrature modulator and quadrature demodulator with a supporting oscillator and divide-by-8 prescaler on a monolithic IC. It operates from a single +3V supply and draws only 5.9mA. The demodulator accepts an amplified and filtered IF signal in the 35MHz to 80MHz range, and demodulates it into I and Q baseband signals with 51dB of voltage conversion gain.MAX2450 usully usus for Digital Cordless Phones、GSM and North American Cellular Phones、Wireless LANs、Digital Communications、Two-Way Pagers.

Key word: Modulator  Demodulato
Baseband Signals   IF

目 录

MAX2450的简介---------------------------------------------------------------4
MAX2450的简介---------------------------------------------------------------4
应用领域--------------------------------------------------------------------4
特点------------------------------------------------------------------------4
定货标准--------------------------------------------------------------------4
最大额定的绝对值------------------------------------------------------------4
直流电气特性----------------------------------------------------------------5
2. MAX2450的芯片封装与引脚功能----------------------------------------------5
3. MAX2450工作特性和内部结构与工作原理  -----------------------------------7
3.1典型的工作特征------------------------------------------------------------7
3.2  内部结构与工作原理------------------------------------------------------10
3.2.1解调器------------------------------------------------------------------10
3.2.2本振部分----------------------------------------------------------------11
3.2.3正交相位发生器----------------------------------------------------------11
3.2.4前置分频器--------------------------------------------------------------11
3.2.5主偏置------------------------------------------------------------------12
4. MAX2450应用电路设计-------------------------------------------------------12
5. 总结----------------------------------------------------------------------13
参考文献--------------------------------------------------------------------14

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