Features: ·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: <10mA
·PCTL Input Filter
·Available in a 8-Pin MSOP Package (LTC4402-1) and 10-Pin MSOP (LTC4402-2)Application·Multiband GSM/GPRS/EDGE Cellular Phones
·PCS Devices
·Wireless Data Modems
·U.S. TDMA Cellular PhonesPinout
SpecificationsVIN to GND ................................................... 0.3V to 6.5V
VPCA, VPCB Voltage ..................................... 0.3V to 4.6V
PCTL Voltage ................................... 0.3V to (VIN + 0.3V)
RF Voltage ............................................. (VIN ± 2.6V) to 7V
SHDN, VHOLD, BSEL Voltage
to GND ............................................. 0.3V to (VIN + 0.3V)
IVPCA/B ....................................................................... 10mA
Operating Temperature Range (Note 2) ... 40°C to 85°C
Storage Temperature Range ................... 65°C to 150°C
Maximum Junction Temperature ................................ 125°C
Lead Temperature (Soldering, 10 sec)....................... 300°C
DescriptionThe 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 power.
The LTC4402-1 is a single output RF power controller with identical performance to the LTC4402-2. The LTC4402-1 has one output to control a single TX PA or dual TX PA module with a single control input and is available in an 8-pin MSOP package.
Internal and external offsets are cancelled over temperature by an autozero control loop. The shutdown feature disables the part and reduces the supply current to <10A.
LTC4402-2 Data Sheet
