LMV228UR

更新时间： 2024-11-20 13:09:23

品牌	Logo	应用领域
美国国家半导体 - NSC		/
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21页	1085K
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LMV228UR 数据手册

March 2005

LMV225/LMV226/LMV228

RF Power Detector for CDMA and WCDMA

General Description

Features

n 30 dB linear in dB power detection range

n Output voltage range 0.2 to 2V

n Logic low shutdown

The LMV225/LMV226/LMV228 are 30 dB RF power detec-

tors 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 com-

pensated output voltage that relates linearly to the RF input

power in dBm. The circuit operates with a single supply from

2.7V to 5.5V. The LMV225/LMV226/LMV228 have an inte-

grated filter for low-ripple average power detection of CDMA

signals with 30 dB dynamic range. Additional filtering can be

applied using a single external capacitor.

n Multi-band operation from 450 MHz to 2000 MHz

n Accurate temperature compensation

n Packages:

— micro SMD package 1.0 mm x 1.0 mm x 0.6 mm

— LLP package 2.2 mm x 2.5 mm x 0.8 mm (LMV225

and LMV228)

The LMV225 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 LMV226/LMV228 have a de-

tection range from –15 dBm to 15 dBm and are intended for

use in combination with a directional coupler. The LMV226 is

equipped with a buffered output which makes it suitable for

GSM, EDGE, GPRS and TDMA applications.

Applications

n CDMA RF power control

n WCDMA RF power control

n CDMA2000 RF power control

n PA modules

The device is active for Enable = HI, otherwise it is in a low

power consumption shutdown 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 re-

quirements.

The LMV225/LMV226/LMV228 power detectors are offered

in the small 1.0 mm x 1.0 mm X 0.6 mm micro SMD pack-

age. The LMV225 and the LMV228 are also offered in the

2.2 mm x 2.5 mm x 0.8 mm LLP package.

Typical Application

LMV226/LMV228

LMV225

20076001

20076046

DS200760

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