LMV232_16 Datasheet, PDF (1/20 Pages) Texas Instruments – LMV232 Dual-Channel Integrated Mean Square Power Detector for CDMA & WCDMA

LMV232
www.ti.com
SNWS017C – DECEMBER 2004 – REVISED MARCH 2013
LMV232 Dual-Channel Integrated Mean Square Power Detector for CDMA & WCDMA
Check for Samples: LMV232
FEATURES
1
• >20 dB Square-Law Detection Range
• 2 Sequentially Selectable RF Inputs
• Low Power Consumption Shutdown Mode
• Externally Configurable Gain and LF Filter
Bandwidth.
• Internal 50Ω RF Termination Impedance
• Optimized for Use with 20 dB Directional
Coupler
• Lead Free 8-Bump DSBGA Package 1.5 x 1.5 x
0.6 mm
APPLICATIONS
• 3G Mobile Communications
• UMTS
• WCDMA
• CDMA2000
• TD-SCDMA
• RF Control
• Wireless LAN
• PC Card and GPS Modules
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 measurement 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 selection 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 DSBGA 1.5 x 1.5 x 0.6 mm package. This
DSBGA package has the smallest footprint and
height.
TYPICAL APPLICATION
RF
INPUT
PA1
COUPLER
ANTENNA
RF
INPUT
PA2
R2
50:
COUPLER
V_DD
GND
R3
50:
TO BASEBAND
B3 B1
OUT
RF_IN1
A3
A1
R1
6.2 k:
C1
1.5 nF
LMV232
FB
A2
RF_IN2
C1
C2
BS
C3
SD
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2013, Texas Instruments Incorporated