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
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.
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