LTC5505 데이터 시트보기 (PDF) - Linear Technology

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LTC5505

RF Power Detector with Buffered Output and >40dB Dynamic Range

Linear Technology 

Final Electrical Specifications

LTC5505-1/LTC5505-2

RF Power Detector

with Buffered Output and >40dB

Dynamic Range

October 2001

FEATURES

s Internal Schottky Diode RF Detector with Two

Power Ranges:

LTC5505-1, –28dBm to 18dBm

LTC5505-2, –32dBm to 12dBm

s Wide Input Frequency Range: 300MHz to 3GHz

s Temperature Compensated

s Buffered Detector Output

s Wide VCC Range of 2.7V to 6V Allows Direct

Connection to Battery

s Low Operating Current: 0.5mA

s Low Shutdown Current: <2µA

s Low Profile (1mm) ThinSOTTM Package

U

APPLICATIO S

s Multimode Mobile Phone Products

s PCS Devices

s Wireless Data Modems

s Wireless and Cable Infrastructure

s RF Power Alarm

s Envelope Detector

DESCRIPTIO

The LTC®5505-X is an RF power detector for RF applica-

tions operating in the 300MHz to 3GHz range. A tempera-

ture compensated Schottky diode peak detector and buffer

amplifier are combined in a small 5-pin ThinSOT package.

The supply voltage range is optimized for operation from

a single lithium-ion cell or 3xNiMH.

The RF input voltage is peak detected using an on-chip

Schottky diode. The detected voltage is buffered and

supplied to the VOUT pin. A power saving shutdown mode

reduces supply current to less than 2µA.

The LTC5505-1 operates with input power levels from

–28dBm to 18dBm. The LTC5505-2 operates with input

power levels from –32dBm to 12dBm.

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

ThinSOT is a trademark of Linear Technology Corporation

TYPICAL APPLICATIO

Dual Band Mobile Phone Tx Power Control

0Ω TO 20Ω

DISABLE ENABLE

33pF

LTC5505-X

1

RFIN

VCC 5

2

GND

3

SHDN

VOUT 4

MOBILE PHONE

DSP

0.1µF

900MHz

INPUT

1.8GHz

INPUT

Li-Ion

BSEL

Tx PA MODULE

900MHz

OUTPUT

VPC

1.8GHz

OUTPUT

DIRECTIONAL

COUPLER DIPLEXER

50Ω

5505 TA01

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

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