LMV227

Production RF Tested, RF Power Detector for CDMA and

WCDMA

General Description

The LMV227 is a 30 dB RF power detector intended for use

in CDMA and WCDMA applications. The device has an RF

frequency range from 450 MHz to 2 GHz. It provides an

accurate temperature and supply compensated output volt-

age that relates linearly to the RF input power in dBm. The

circuit operates with a single supply from 2.7V to 5V. The

LMV227 has an integrated filter for low-ripple average power

detection of CDMA signals with 30 dB dynamic range. Addi-

tional filtering can be applied using a single external capaci-

tor.

The LMV227 has an RF power detection range from -30

dBm to 0 dBm and is ideally suited for direct use in combi-

nation with resistive taps. The device is active for Enable =

HI, otherwise it goes into a low power consumption shut-

down mode. During shutdown the output will be LOW. The

output voltage ranges from 0.2V to 2V and can be scaled

down to meet ADC input range requirements. The output

signal bandwidth can optionally be lowered externally as

well.

Features

n

30 dB linear in dB power detection range

n

Output voltage range 0.2 to 2V

n

Logic low shutdown

n

Multi-band operation from 450 MHz to 2000 MHz

n

Accurate temperature compensation

Applications

n

CDMA RF power control

n

WCDMA RF power control

n

CDMA2000 RF power control

n

PA modules

Typical Application

20118101

July 2006

© 2006 National Semiconductor Corporation

DS201181

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