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LTC1757A-2 - 典型应用图例：
LTC1757A-2典型应用图例一
LTC1757A-2 - 封装图解：
LTC1757A-2封装图解一
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LINEAR产品 - LTC1757A-2介绍

LTC1757A-2 - LTC1757A-2是Single/Dual Band RF Power Controllers

LTC1757A-2是LINEAR凌力尔特公司的一款功率放大器控制器产品，LTC1757A-2是LTC1757A-2是Single/Dual Band RF Power Controllers，本站介绍了LTC1757A-2的封装应用图解、特点和优点、功能等，并给出了与LTC1757A-2相关的LINEAR元器件型号供参考。

LTC1757A-2 - LTC1757A-2是Single/Dual Band RF Power Controllers - 功率放大器控制器 - RF和无线 - 凌力尔特

LTC1757A-2 - Single/Dual Band RF Power Controllers

LTC1757A-1 - Single/Dual Band RF Power Controllers - Linear Technology（凌力尔特）

功能描述
The LTC1757A-2 is a dual band RF power controller for RF power amplifiers operating in the 850MHz to 2GHz range. The LTC1757A is pin compatible with the LTC1757 but has improved RF detection range. The input voltage range is optimized for operation from a single lithium-ion cell or 3x NiMH. Several functions required for RF power control and protection are integrated in one small 10-pin MSOP package, thereby minimizing PCB area.

The LTC1757A-1 is a single output RF power controller that is identical in performance to the LTC1757A-2 except that one output (VPCA) is provided. The LTC1757A-1 can be used to drive a single RF channel or dual channel module with integral multiplexer. This part is available in an 8-pin MSOP package.

RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power via a directional coupler. The RF sense 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 supply voltage and current and 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 <1µA.

特点
  • Dual Band RF Power Amplifier Control (LTC1757A-2)
  • Improved Internal Schottky Diode Detector
  • Wide Input Frequency Range: 850MHz to 2GHz
  • Autozero Cancels Initial Offsets and Temperature Dependent Offset Errors
  • Wide VIN Range of 2.7V to 6V Allows Direct Connection to Battery
  • RF Output Power Set by External DAC
  • Fast Acquire After Transmit Enable
  • Internal Frequency Compensation
  • Rail-to-Rail Power Control Outputs
  • RF PA Supply Current Limiting
  • Battery Overvoltage Protection
  • Power Control Signal Overvoltage Protection
  • Low Operating Current: 1mA
  • Very Low Shutdown Current: <1µA
  • Available in a 8-Pin MSOP Package (LTC1757A-1) and 10-Pin MSOP (LTC1757A-2)
    • 应用
  • Single and Dual Band GSM Cellular Telephones
  • PCS Devices
  • Wireless Data Modems
  • TDMA Cellular Telephones
    • 以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
    器件型号 封装 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量)
    LTC1757A-1EMS8 MS-8 E $2.00 $1.75
    LTC1757A-1EMS8#PBF MS-8 E $2.00 $1.75
    LTC1757A-1EMS8#TR MS-8 E $1.81
    LTC1757A-1EMS8#TRPBF MS-8 E $1.81
    LTC1757A-2EMS MS-10 E $2.10 $1.90
    LTC1757A-2EMS#PBF MS-10 E $2.10 $1.90
    LTC1757A-2EMS#TR MS-10 E $1.96
    LTC1757A-2EMS#TRPBF MS-10 E $1.96
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