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LMV232TLX Datasheet

  • LMV232TLX

  • Dual-Channel Integrated Mean Square Power Detector for CDMA ...

  • 13頁

  • NSC

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LMV232 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
IN
1 is active. In case BS = LOW, RF
IN
2 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
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>
20 dB square-law detection range
2 sequentially selectable RF inputs
Low power consumption shutdown mode
Externally configurable gain and LF filter bandwidth.
Internal 50鈩?RF termination impedance
Optimized for use with 20 dB directional coupler
Lead free 8-bump micro SMD package 1.5 x 1.5 x 0.6
mm
Applications
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3G mobile communications
UMTS
WCDMA
CDMA2000
TD-SCDMA
RF control
Wireless LAN
PC Card and GPS modules
Typical Application
20127801
漏 2005 National Semiconductor Corporation
DS201278
www.national.com

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