厂商：Freescale
类别：16位单片机
厂商：Linear
类别：开关稳压器
厂商：TDK
类别：压敏电阻
厂商：Atmel
类别：LIN 网络连接
类别：I2C和SMBus总线缓冲器和加速器
厂商：
类别：Circulators / Isolators
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特点Dual Band RF Power Amplifier Control (LTC1957-2)Internal Schottky Diode Detector with Improved Dynamic Range vs the LTC1757AWide Input Frequency Range: 850MHz to 2GHzAutozero Loop Cancels Offset Errors and Temperature Dependent Offsets Wide V IN Range: 2.7V to 6V Allows Direct Connection to BatteryRF Output Power Set by External DACFast Acquire After Transmit EnableInternal Frequency CompensationRail-to-Rail Power Control OutputsPower Control Signal Overvoltage ProtectionLow Operating Current: 1mAVery Low Shutdown Current: <1μA Available in a 8-pin MSOP Package (LTC1957-1) and 10-Pin MSOP (LTC1957-2) Pin Compatible with the LTC1757A-XImproved Start Voltage Accuracy and RangeImproved PCTL Input Filtering典型应用描述The LTC1957-1 is a single output RF power controller that is identical in performance to the LTC1957-2 except that one output (V PCA ) 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.