LTC4401-2 Linear Technology, LTC4401-2 Datasheet

LTC4401-2

Manufacturer Part Number

LTC4401-2

Description

RF Power Controllers

Manufacturer

Linear Technology

Datasheet

1.LTC4401-2.pdf (16 pages)

Available stocks

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Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LTC4401-2EMS8

Manufacturer:

Quantity:

10 000

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FEATURES

APPLICATIO S

TYPICAL APPLICATIO

RF Power Amplifier Control in ThinSOT

Internal Schottky Diode Detector with > 45dB Range

Wide Input Frequency Range:

Autozero Loop Cancels Offset Errors and

Temperature Dependent Offsets

Wide V

Automatic Bandwidth Control Improves Low Power

Ramp Response

Allows Direct Connection to Battery

RF Output Power Set by External DAC

Internal Frequency Compensation

Rail-to-Rail Power Control Output

Power Control Signal Overvoltage Protection

Low Operating Current: 1mA

Low Shutdown Current: 10 A

Two Pole PCTL Input Filtering

Low Profile (1mm) SOT-23 (ThinSOT™) (LTC4401-1)

and 8-Pin MSOP (LTC4401-2) Packages

GSM/GPRS Cellular Telephones

PCS Devices

Wireless Data Modems

U.S. TDMA Cellular Phones

300MHz to 2.7GHz (LTC4401-1)

300MHz to 2GHz (LTC4401-2)

Range: 2.7V to 6V

Li-Ion

0.1 F

DAC

SHDN

LTC4401-1 Dual Band Cellular Telephone Transmitter

SHDN

PCTL

LTC4401-1

GND

PCA

Package

33pF

900MHz

1.8GHz

INPUT

DESCRIPTIO

The LTC

turn-on RF power amplifiers operating in the 300MHz to

2.7GHz range. The loop bandwidth is set at 250kHz

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 compared 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 tempera-

ture by an autozero control loop, allowing accurate low

power programming. The shutdown feature disables the

part and reduces the supply current to < 10 A.

A dual control channel version (LTC4401-2) is also

available in an 8-pin MSOP package.

ThinSOT is a trademark of Linear Technology Corporation.

, LTC and LT are registered trademarks of Linear Technology Corporation.

and 45dB Dynamic Range

PA MODULE

SELECT

BAND

4401-1 is a SOT-23 RF power controller for slow

OUTPUT

900MHz

1.8GHz

with 250kHz Loop BW

LTC4401-1/LTC4401-2

RF Power Controllers

www.DataSheet4U.com

4401 TA01

4401fa

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