LMV225_14 Datasheet, PDF (1/30 Pages) Texas Instruments – RF Power Detector for CDMA and WCDMA

LMV225, LMV226, LMV228
www.ti.com
SNWS013K – MAY 2004 – REVISED OCTOBER 2006
LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
Check for Samples: LMV225, LMV226, LMV228
FEATURES
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•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:
– micro SMD thin 1.0 mm x 1.0 mm x 0.6 mm
– micro SMD ultra thin 1.0 mm x 1.0 mm x
0.35 mm
– LLP 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 micro SMD
package and the ultra thin 1.0 mm x 1.0 mm x 0.35 mm micro SMD package. The LMV225 and the LMV228 are
also offered in the 2.2 mm x 2.5 mm x 0.8 mm LLP package.
Typical Application
RF
PA
ANTENNA
R₁
1.8 k:
C
100 pF
V_DD
ENABLE
R₂
10 k:
RF_IN/E_N
LMV225
OUT
GND
Figure 1. LMV225
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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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