LMV225_16 Datasheet, PDF (1/37 Pages) Texas Instruments – LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA

LMV225, LMV226, LMV228
www.ti.com
SNWS013L – AUGUST 2003 – REVISED MARCH 2013
LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
Check for Samples: LMV225, LMV226, LMV228
FEATURES
1
•2 30 dB Linear in dB Power Detection Range
• Output Voltage Range 0.2 to 2V
• Logic Low Shutdown
• Multi-Band Operation from 450 MHz to 2000
MHz
• Accurate Temperature Compensation
• Packages:
– DSBGA Thin 1.0 mm x 1.0 mm x 0.6 mm
– DSBGA Ultra Thin 1.0 mm x 1.0 mm x 0.35
mm
– WSON 2.2 mm x 2.5 mm x 0.8 mm
– (LMV225 and LMV228)
APPLICATIONS
• CDMA RF Power Control
• WCDMA RF Power Control
• CDMA2000 RF Power Control
• PA Modules
DESCRIPTION
The LMV225/LMV226/LMV228 are 30 dB RF power
detectors 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 compensated 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
integrated 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.
The LMV225 has an RF power detection range from
–30 dBm to 0 dBm and is ideally suited for direct use
in combination with resistive taps. The
LMV226/LMV228 have a detection 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.
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 requirements.
The LMV225/LMV226/LMV228 power detectors are
offered in the thin 1.0 mm x 1.0 mm x 0.6 mm
DSBGA package and the ultra thin 1.0 mm x 1.0 mm
x 0.35 mm DSBGA package. The LMV225 and the
LMV228 are also offered in the 2.2 mm x 2.5 mm x
0.8 mm WSON package.
Typical Application
RF
PA
ANTENNA
R1
1.8 k:
VDD
C
100 pF
ENABLE
R2
10 k:
RFIN/EN
LMV225
OUT
GND
Figure 1. LMV225
RF
PA
ANTENNA
C
100 pF
50:
VDD
RFIN/EN
LMV226/
LMV228
OUT
ENABLE
R2
10 k:
GND
Figure 2. LMV226/LMV228
1
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2
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.
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