MAX4473中文资料低成本、低电压、PA功率控制放大器，用于GSM应用数据手册ADI规格书

描述 Description

The MAX4473 PA power control IC is intended for closed-loop bias control of GSM power amplifiers. The device facilitates accurate control of the current delivered to the power amplifier (PA) through a control voltage. The error amplifier senses the voltage drop across an external current-sense resistor placed between the supply and the PA. The output of the error amplifier adjusts the PA gain until the current is proportional to the power control voltage applied to the MAX4473. This unique topology is useful in time-division-multiple-access (TDMA) systems, such as GSM, where accurate transmit burst shaping and power control is required. User-selectable current sensing and gain setting resistors maximize flexibility.
The MAX4473 operates from a single 2.7V to 6.5V supply and typically draws 1.2mA of supply current. The error amplifier has a common-mode range that extends from 1V to VCC. The power control input and error amplifier outputs swing rail-to-rail. A low-power shutdown mode reduces supply current to less than 1µA and activates an on-board active pull-down at the error amplifier output. Fast enable/disable times of 0.9µs reduce average power consumption without compromising dynamic performance. The MAX4473 is available in a space-saving 8-pin µMAX® package.

特性 Features

• Optimized for GSM Timing Requirements
• 1.2mA Supply Current
• Guaranteed 1.5µs Enable/Disable Times
• Rail-to-Rail Error Amplifier Output
• Output Drive Capability–500Ω and 300pF Loads
• No Phase-Reversal for Common-Mode Voltage from 0 to VCC
• Available in a Space-Saving 8-Pin µMAX

应用 Application

• 无绳电话
• 高频伺服环路
• 精密电流控制

简介

MAX4473属于RF/IF射频/中频RFID的RF功率控制器IC。由制造生产的MAX4473RF 功率控制器 ICRF 功率控制 IC 器件可用于测量正在发射的信号的射频功率，并向可编程放大器或类似设备提供相应反馈信号，以保持所需的发射信号功率水平。