Datasheet LTC4401-1, LTC4401-2 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | RF Power Controllers with 250kHz Loop BW and 45dB Dynamic Range |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTIO. RF Power Amplifier Control in ThinSOTTM Package. … |
| Formato / tamaño de archivo | PDF / 196 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. RF Power Amplifier Control in ThinSOTTM Package. Internal Schottky Diode Detector with > 45dB Range
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LTC4401-1/LTC4401-2 RF Power Controllers with 250kHz Loop BW and 45dB Dynamic Range
U FEATURES DESCRIPTIO
■
RF Power Amplifier Control in ThinSOTTM Package
The LTC®4401-1 is a SOT-23 RF power controller for slow ■
Internal Schottky Diode Detector with > 45dB Range
turn-on RF power amplifiers operating in the 300MHz to ■
Wide Input Frequency Range:
2.7GHz range. The loop bandwidth is set at 250kHz
300MHz to 2.7GHz (LTC4401-1)
to improve frequency stability when controlling slow
300MHz to 2GHz (LTC4401-2)
turn-on RF power amplifiers such as the Conexant ■
Autozero Loop Cancels Offset Errors and
CX77301/CX77302, CX77304, CX77314, Anadigics
Temperature Dependent Offsets
AWT6107 and the RF Micro Devices RF3160. ■
Wide VCC Range: 2.7V to 6V
RF power is controlled by driving the RF amplifier power ■ Automatic Bandwidth Control Improves Low Power control pins and sensing the resultant RF output power Ramp Response via a directional coupler. The RF sense voltage is peak ■ Allows Direct Connection to Battery detected using an on-chip Schottky diode. This detected ■ RF Output Power Set by External DAC voltage is compared to the DAC voltage at the PCTL pin ■ Internal Frequency Compensation to control the output power. The RF power amplifier is ■ Rail-to-Rail Power Control Output protected against high power control pin voltages. ■ Power Control Signal Overvoltage Protection ■ Low Operating Current: 1mA Internal and external offsets are cancelled over tempera- ■ Low Shutdown Current: 10µA ture by an autozero control loop, allowing accurate low ■ Two Pole PCTL Input Filtering power programming. The shutdown feature disables the ■ Low Profile (1mm) SOT-23 (ThinSOT™) (LTC4401-1) part and reduces the supply current to < 10µA. and 8-Pin MSOP (LTC4401-2) Packages
U
A dual control channel version (LTC4401-2) is also
APPLICATIO S
available in an 8-pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. ■ GSM/GPRS Cellular Telephones ThinSOT is a trademark of Linear Technology Corporation. ■ PCS Devices ■ Wireless Data Modems ■ U.S. TDMA Cellular Phones
U TYPICAL APPLICATIO LTC4401-1 Dual Band Cellular Telephone Transmitter
68Ω 33pF 6 1 Li-Ion BAND 0.1µF VCC RF SELECT LTC4401-1 4 5 SHDN 900MHz SHDN VPCA VPC OUTPUT 3 2 900MHz DAC PCTL GND PA MODULE INPUT 1.8GHz 1.8GHz 50Ω INPUT OUTPUT 4401 TA01 4401fa 1
U FEATURES DESCRIPTIO
■
RF Power Amplifier Control in ThinSOTTM Package
The LTC®4401-1 is a SOT-23 RF power controller for slow ■
Internal Schottky Diode Detector with > 45dB Range
turn-on RF power amplifiers operating in the 300MHz to ■
Wide Input Frequency Range:
2.7GHz range. The loop bandwidth is set at 250kHz
300MHz to 2.7GHz (LTC4401-1)
to improve frequency stability when controlling slow
300MHz to 2GHz (LTC4401-2)
turn-on RF power amplifiers such as the Conexant ■
Autozero Loop Cancels Offset Errors and
CX77301/CX77302, CX77304, CX77314, Anadigics
Temperature Dependent Offsets
AWT6107 and the RF Micro Devices RF3160. ■
Wide VCC Range: 2.7V to 6V
RF power is controlled by driving the RF amplifier power ■ Automatic Bandwidth Control Improves Low Power control pins and sensing the resultant RF output power Ramp Response via a directional coupler. The RF sense voltage is peak ■ Allows Direct Connection to Battery detected using an on-chip Schottky diode. This detected ■ RF Output Power Set by External DAC voltage is compared to the DAC voltage at the PCTL pin ■ Internal Frequency Compensation to control the output power. The RF power amplifier is ■ Rail-to-Rail Power Control Output protected against high power control pin voltages. ■ Power Control Signal Overvoltage Protection ■ Low Operating Current: 1mA Internal and external offsets are cancelled over tempera- ■ Low Shutdown Current: 10µA ture by an autozero control loop, allowing accurate low ■ Two Pole PCTL Input Filtering power programming. The shutdown feature disables the ■ Low Profile (1mm) SOT-23 (ThinSOT™) (LTC4401-1) part and reduces the supply current to < 10µA. and 8-Pin MSOP (LTC4401-2) Packages
U
A dual control channel version (LTC4401-2) is also
APPLICATIO S
available in an 8-pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. ■ GSM/GPRS Cellular Telephones ThinSOT is a trademark of Linear Technology Corporation. ■ PCS Devices ■ Wireless Data Modems ■ U.S. TDMA Cellular Phones
U TYPICAL APPLICATIO LTC4401-1 Dual Band Cellular Telephone Transmitter
68Ω 33pF 6 1 Li-Ion BAND 0.1µF VCC RF SELECT LTC4401-1 4 5 SHDN 900MHz SHDN VPCA VPC OUTPUT 3 2 900MHz DAC PCTL GND PA MODULE INPUT 1.8GHz 1.8GHz 50Ω INPUT OUTPUT 4401 TA01 4401fa 1