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低成本、低电压、PA功率控制放大器,用于GSM应用

产品详情

主要特征

应用/用途

Parametric specs for Operational Amplifiers
Unity Gain BW (MHz) (typ) 2
Input IBIAS (nA) (max) 1000
VOS (µV) (max) 2000
VSUPPLY (Total) (V) (min) 2.7
VSUPPLY (Total) (V) (max) 6.5
# Amplifiers 1
Rail to Rail Input/Output
Package/Pins UMAX/8
Budgetary
Price (See Notes)
1.95
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参量

Parametric specs for Operational Amplifiers
Unity Gain BW (MHz) (typ) 2
Input IBIAS (nA) (max) 1000
VOS (µV) (max) 2000
VSUPPLY (Total) (V) (min) 2.7
VSUPPLY (Total) (V) (max) 6.5
# Amplifiers 1
Rail to Rail Input/Output
Package/Pins UMAX/8
Budgetary
Price (See Notes)
1.95

主要特征

  • Optimized for GSM Timing Requirements
  • 2.7V to 6.5V Single-Supply Operation
  • 1.2mA Supply Current
  • ≤ 1µA Supply Current in Shutdown Mode
  • Guaranteed 1.5µs Enable/Disable Times
  • Active Output Pull-Down in Shutdown Mode
  • Rail-to-Rail Error Amplifier Output
  • Rail-to-Rail Power Control Input
  • Output Drive Capability–500Ω and 300pF Loads
  • 1V to VCC Current Sense Input Common-Mode Voltage Range
  • No Phase-Reversal for Common-Mode Voltage from 0 to VCC
  • External Current Sensing and Gain Setting Resistors Maximize Flexibility
  • Available in a Space-Saving 8-Pin µMAX

应用/用途

  • 无绳电话
  • GSM蜂窝电话
  • 高频伺服环路
  • 精密电流控制

描述

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.

简化框图

MAX4473:典型工作电路 MAX4473:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心