LMV232 Datasheet, PDF (1/13 Pages) National Semiconductor (TI) – Dual-Channel Integrated Mean Square Power Detector for CDMA & WCDMA

February 2005
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_IN1 is active. In case BS = LOW, RF_IN2 is active.
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
n >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 50Ω 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
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