LTC1757A-1

U U LTC1757A-1/LTC1757A-2 Single/Dual Band RF Power Controllers FEATURES DESCRIPTIO s Dual Band RF Power Amplifier Control (LTC1757A-2) s Improved Internal Schottky Diode Detector s Wide Input Frequency Range: 850MHz to 2GHz s Autozero Cancels Initial Offsets and Temperature Dependent Offset Errors s Wide VIN Range of 2.7V to 6V Allows Direct Connection to Battery s RF Output Power Set by External DAC s Fast Acquire After Transmit Enable s Internal Frequency Compensation s Rail-to-Rail Power Control Outputs s RF PA Supply Current Limiting s Battery Overvoltage Protection s Power Control Signal Overvoltage Protection s Low Operating Current: 1mA s Very Low Shutdown Current: < 1µA s Available in a 8-Pin MSOP Package (LTC1757A-1) and 10-Pin MSOP (LTC1757A-2) U APPLICATIO S s Single/Dual Band GSM Cellular Telephones s PCS Devices s Wireless Data Modems s TDMA Cellular Telephones , LTC and LT are registered trademarks of Linear Technology Corporation. The LTC®1757A-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 3× 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 LTC175...