LMV232

Dual-Channel Integrated Mean Square Power Detector

for CDMA & WCDMA

General Description

The LMV232 dual RF detector is designed for RF transmit

power measurement in mobile phones. This dual mean

square IC is especially suited for accurate power measure-

ment of RF signals exhibiting high peak-to-average ratios

used in 3G and UMTS/CDMA applications. The LMV232

saves calibration steps and system certification and is highly

accurate. The circuit operates with a single supply from 2.5

to 3.3V.

The LMV232 contains a mean square detector with two

sequentially selectable RF inputs. The RF input power range

of the device has been optimized for use with a 20 dB

directional coupler, without the need for additional external

components. A single external RC combination between FB

and OUT provides an externally configurable gain and LF

filter bandwidth of the device.

The device has two digital interfaces. A shutdown function is

available to set the device in a low-power shutdown mode. In

case SD = HIGH, the device is in shutdown, if SD = LOW the

device is active. The Band-Select function controls the se-

lection of the active RF input channel. In case BS = HIGH,

RF

The dual mean square detector is offered in an 8-bump

micro SMD 1.5 x 1.5 x 0.6 mm package. This micro SMD

package has the smallest footprint and height.

Features

20 dB square-law detection range

n

2 sequentially selectable RF inputs

n

Low power consumption shutdown mode

n

Externally configurable gain and LF filter bandwidth.

n

Internal 50

Ω RF termination impedance

n

Optimized for use with 20 dB directional coupler

n

Lead free 8-bump micro SMD package 1.5 x 1.5 x 0.6

mm

Applications

n

3G mobile communications

n

UMTS

n

WCDMA

n

CDMA2000

n

TD-SCDMA

n

RF control

n

Wireless LAN

n

PC Card and GPS modules

Typical Application

20127801

February 2005

© 2005 National Semiconductor Corporation

DS201278

www.national.com