LTC4400-1 RF Power Controllers with 450kHz Loop BW and 45dB Dynamic Range

The LTC®4400-1 is a SOT-23 RF power controller for fast turn-on RF power amplifiers operating in the 300MHz to 2.7GHz range. Examples include the Hitachi PF08109B, PF08122B, PF08123B, PF08107B and RF Micro Devices RF3108. For slow turn-on RF power amplifiers refer to the LTC4401-1/LTC4401-2.

RF power is controlled by driving the RF amplifier power control pin and sensing the resultant RF output power via a directional coupler or capacitive tap. The RF input voltage is peak detected using an on-chip Schottky diode. This detected voltage is compared to the DAC voltage at the PCTL pin to control the output power. The RF power amplifier is protected against high power control pin voltages.

Internal and external offsets are cancelled over temperature by an autozero control loop, allowing accurate low power programming. The shutdown feature disables the part and reduces the supply current to <10µA.

A dual control channel version (LTC4400-2) is also available in an 8-pin MSOP package

产品特点 Features
  • RF Power Amplifier Control in ThinSOT™ Package
  • Internal Schottky Diode Detector with > 45dB Range
  • Wide Input Frequency Range:
    300MHz to 2.7GHz (LTC4400-1)
    300MHz to 2GHz (LTC4400-2)
  • Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets
  • Wide VCC Range: 2.7V to 6V
  • Automatic Bandwidth Control Improves Low Power Ramp Response
  • Allows Direct Connection to Battery
  • RF Output Power Set by External DAC
  • Internal Frequency Compensation
  • Rail-to-Rail Power Control Output
  • Power Control Signal Overvoltage Protection
  • Low Operating Current: 1mA
  • Low Shutdown Current: 10µA
  • Two Pole PCTL Input Filtering
  • Low Profile (1mm) ThinSOT (LTC4400-1) and 8-Pin MSOP (LTC4400-2) Packages
应用
  • GSM/GPRS Cellular Telephones
  • PCS Devices
  • Wireless Data Modems
  • U.S. TDMA Cellular Phones
典型应用图
LTC4400 典型应用
参数
LTC4400 参数
LTC4400-1 订购信息和价格参考Package Variations and Pricing
器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量) *
LTC4400-1ES6 SOT 6 E $1.47
LTC4400-1ES6#PBF SOT 6 E $1.47
LTC4400-1ES6#TR SOT 6 E $1.47 $1.25
LTC4400-1ES6#TRM SOT 6 E $1.47 $1.27
LTC4400-1ES6#TRMPBF SOT 6 E $1.47 $1.27
LTC4400-1ES6#TRPBF SOT 6 E $1.47 $1.25
LTC4400-2EMS8 MSOP 8 E $2.32 $1.60
LTC4400-2EMS8#PBF MSOP 8 E $2.32 $1.60
LTC4400-2EMS8#TR MSOP 8 E $1.66
LTC4400-2EMS8#TRPBF MSOP 8 E $1.66
LTC4400-1 数据手册及相关资料下载
  1. 数据手册 (英文) : LTC4400-1/LTC4400-2 - RF Power Controllers with 450kHz Loop BW and 45dB Dynamic Range.PDF
  2. 应用指南 (英文) : AN91 - Low Cost Coupling Methods for RF Power Detectors Replace Directional Couplers.PDF
  3. 可靠性数据 : R421 Reliability Data .PDF