LTC4402-2

www.DataSheet4U.com LTC4402-1/LTC4402-2 Multiband RF Power Controllers for EDGE/TDMA FEATURES s s DESCRIPTIO s s s s s s s s s s s s s s Supports AM Modulation in EDGE/TDMA (ANSI-136) Applications Single Output RF Power Amplifier Control (LTC4402-1) Dual Output RF Power Amplifier Control (LTC4402-2) Internal Schottky Diode Detector with >40dB Range Wide Input Frequency Range: 300MHz to 2.4GHz Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets Wide VIN Range: 2.7V to 6V 450kHz Loop Bandwidth Allows Direct Connection to Battery RF Output Power Set by External DAC Internal Frequency Compensation Rail-to-Rail Power Control Outputs Low Operating Current: 1mA Low Shutdown Current: < 10µA PCTL Input Filter Available in a 8-Pin MSOP Package (LTC4402-1) and 10-Pin MSOP (LTC4402-2) The LTC®4402-2 is a multiband RF power controller for RF power amplifiers operating in the 300MHz to 2.4GHz range. The LTC4402-2 has two outputs to control dual TX PA modules with two control inputs. An internal sample and hold circuit enables the LTC4402-2 to be used with AM modulation via the carrier or PA supply. The input voltage range is optimized for operation from a single lithium-ion cell or 3 × NiMH. RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power. 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 powe...