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LTC1957-1 - 典型应用图例：

LTC1957-1 - 封装图解：

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LTC1957-1 - LTC1957-1是Single/Dual Band RF Power Controllers with 40dB Dynamic Range

LTC1957-1是LINEAR凌力尔特公司的一款功率放大器控制器产品，LTC1957-1是LTC1957-1是Single/Dual Band RF Power Controllers with 40dB Dynamic Range，本站介绍了LTC1957-1的封装应用图解、特点和优点、功能等，并给出了与LTC1957-1相关的LINEAR元器件型号供参考。

LTC1957-1 - LTC1957-1是Single/Dual Band RF Power Controllers with 40dB Dynamic Range - 功率放大器控制器 - RF和无线 - 凌力尔特

LTC1957-1 - Single/Dual Band RF Power Controllers with 40dB Dynamic Range

LTC1957-1 - Single/Dual Band RF Power Controllers with 40dB Dynamic Range - Linear Technology（凌力尔特）

功能描述

The LTC1957-2 is a dual band RF power controller for power amplifiers operating in the 850MHz to 2GHz 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 LTC1957-1 is a single output RF power controller that is identical in performance to the LTC1957-2 except that one output (VPCA) is provided. The LTC1957-1 can be used to drive a single RF 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 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 (LTC1957-2)

Internal Schottky Diode Detector with Improved Dynamic Range vs the LTC1757A

Wide Input Frequency Range: 850MHz to 2GHz

Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets

Wide VIN Range: 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

Power Control Signal Overvoltage Protection

Low Operating Current: 1mA

Very Low Shutdown Current: <1µA

Available in a 8-pin MSOP Package (LTC1957-1) and10-Pin MSOP (LTC1957-2)

Pin Compatible with the LTC1757A-X

Improved Start Voltage Accuracy and Range

Improved PCTL Input Filtering

应用

Single and Dual Band GSM/GPRS Cellular Telephones

PCS Devices

Wireless Data Modems

U.S. TDMA Cellular Phones

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)
LTC1957-1EMS8	MS-8	E	$1.95	$1.65
LTC1957-1EMS8#PBF	MS-8	E	$1.95	$1.65
LTC1957-1EMS8#TR	MS-8	E		$1.70
LTC1957-1EMS8#TRPBF	MS-8	E		$1.70
LTC1957-2EMS	MS-10	E	$2.03	$1.70
LTC1957-2EMS#PBF	MS-10	E	$2.03	$1.70
LTC1957-2EMS#TR	MS-10	E		$1.75
LTC1957-2EMS#TRPBF	MS-10	E		$1.75

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