基于MAX2753的芯片简介及应用电路设计

字数：4153，页数：19

摘 要
   简要介绍MAX2753的内部结构与工作原理、芯片封装与引脚功能、电气特性、典型的应用电路。MAX2753的是一个独立的压控振荡器(VCO),用于兼容低中频或零中频体系的2.4GHz无线电接收装置. 它充分地结合了综合振荡器和输出缓冲器，采用微型的8脚μMAX 封装. 芯片结合了感应器和变容二极管的tank原理,大大简化了应用部分. 唯一的必需是外部构成有两个补给的旁路电容器. MAX2753 对VCO 协调电压输入和VCO缓冲区产量提供直接的连接。 输出电压的调整范围为0.4－2.4V，振荡器频率调整范围是由制造厂规定的，以保证其工作在正常的状态. 输出信号被缓冲一个放大器阶段(内部匹配 50 ),提供更高的输出功率并且把设备和负载阻抗变化隔离. 此外,max2753提供差分输出.  MAX2753也提供数字式控制关闭方式允许复杂的电源管理的实施。
  
关键字：单片压控振荡器    差分输出   
输出缓冲器    感应器       变容二极管   旁路电容器

Abstract
It briefly introduced the MAX2753’s internal structure and Operating element 、chip package and pin function、electrical characteristics and typical apply circuit . The MAX2753 is a self-contained voltage-controlled oscillator (VCO) intended for use in 2.4GHz radios that utilize a low-IF or zero-IF architecture. It combines a fully integrated oscillator and output buffer in a miniature 8-pin μMAX package. The inductor and varactor elements of the tank are integrated on-chip, greatly simplifying application of the part. The only required external components are a couple of supply bypass capacitors. The MAX2753 provides direct connection to the VCO tuning voltage input and the VCO buffer output. The tuning voltage input range is +0.4V to +2.4V, and the oscillator frequency tuning range is factory adjusted to provide guaranteed limits. The output signal is buffered by an amplifier stage (internally matched to 50 ) to provide higher output power and isolate the device from load impedance variations. In addition, the MAX2753 provides differential outputs. The MAX2753 also provides a digitally controlled shutdown mode to permit implementation of sophisticated power-supply management.

Key words:  Monolithic Voltage-Controlled Oscillator   differential outputs             
               output buffer      inductor      varactor   bypass capacitors

目录

1.  MAX2753简介....................................................................4
2.  MAX2753的主要电气特性..........................................................4
2.1 MAX2753的直流特性..............................................................5
2.2 MAX2753的交流特性..............................................................6
2.3 MAX2753的典型工作特性曲........................................................7
3.  MAX2753的芯片封装与引脚功能...................................................12
3.1 MAX2753芯片的封装形式.........................................................12
3.2 MAX2753芯片的引脚功能.........................................................13
4.  MAX2753的内部结构与工作原理...................................................15
5.  MAX2753的应用电路设计.........................................................15
    5.1 外置元件..................................................................16
    5.2 特性......................................................................16
    5.3 布线和电源旁路............................................................16
6.  MAX2753评估工具...............................................................16
    6.1 MAX2753评估工具的简介.....................................................16
    6.2 MAX2753评估工具的应用电路图...............................................16
7.  总结..........................................................................19