DESCRIPTION
The LTC4403-2 is a multiband RF power controller for
RF power amplifiers operating in the 300MHz to 2.4GHz
range. The LTC4403-2 has two outputs to control dual T
PA modules with two control inputs. An internal sample
and hold circuit enables the LTC4403-2 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
powercontrol 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 LTC4403-1 is a single output RF power controller
with identical performance to the LTC4403-2. The
LTC4403-1 has one output to control a single TPA or
dual TPA module with a single control input and is
available in an 8-pin MSOP package.
Internal and external offsets are cancelled over tempera-
ture by an autozero control loop. The shutdown feature
disables the part and reduces the supply current to
< 10µA.
FEATURES
Supports AM Modulation in EDGE/TDMA (ANSI-136)
Applications
Single Output RF Power Amplifier Control
(LTC4403-1)
Dual Output RF Power Amplifier Control (LTC4403-2)
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 V Range: 2.7V to 6V
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 (LTC4403-1)
and 10-Pin MSOP (LTC4403-2)
APPLICATIONS
Multiband GSM/GPRS/EDGE Cellular
Telephones
PCS Devices
Wireless Data Modems
U.S. TDMA Cellular Phones
TYPICAL APPLICATION
LTC4403-2 Multiband EDGE Cellular Telephone Transmitter
MS8 PACKAGE
MS PACKAGE
TYPICAL APPLICATION
Dual Band Cellular Telephone Transmitter
Single Band Cellular Telephone Transmitter
P/N Package
LTC4403-1EMS8 MSOP
LTC4403-2EMS MSOP
FROM: Company Name: Aunytor Electronic (HK) Co.,Ltd
Contact Person: Charlotte
Skype: Aunytor
whatsapp：+86 13537622113
Email: carrot@aunytorchips.com