LTC4401-2 Datasheet | Linear Technology

.. LTC4401-1/LTC4401-2 RF Power Controllers with 250k Hz Loop BW and 45d B Dynamic Range Features s s s DESCRIPTIO TM s s s s s s s s s s s s U APPLICATIO S s s s s RF Power Amplifier Control in Thin SOT Package Internal Schottky Diode Detector with > 45d B Range Wide Input Frequency Range: 300MHz to 2.7GHz (LTC4401-1) 300MHz to 2GHz (LTC4401-2) Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets Wide VCC Range: 2.7V to 6V Automatic Bandwidth Control Improves Low Power Ramp Response Allows Direct Connection to Battery RF Output Power Set by External DAC Internal Frequency pensation Rail-to-Rail Power Control Output Power Control Signal Overvoltage Protection Low Operating Current: 1m A Low Shutdown Current: 10µA Two Pole PCTL Input Filtering Low Profile (1mm) SOT-23 (Thin SOT™) (LTC4401-1) and 8-Pin MSOP (LTC4401-2) Packages The LTC®4401-1 is a SOT-23 RF power controller for slow turn-on RF power amplifiers operating in the 300MHz to 2.7GHz range. The loop bandwidth is set at 250k Hz to improve frequency stability when controlling slow turn-on RF power amplifiers such as the Conexant CX77301/CX77302, CX77304, CX77314, Anadigics AWT6107 and the RF Micro Devices RF3160. 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 pared to the DAC voltage at the PCTL pin to control the output power. The RF power amplifier is protected against 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 < 10µA. A dual control channel version (LTC4401-2) is also available in an 8-pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a...