The LMV221 is a 40-dB RF power detector intended for use in CDMA and WCDMA applications.
The device has an RF frequency range from 50 MHz to 3.5 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 2.7 V to 3.3 V.
The LMV221 has an RF power detection range from −45 dBm to −5 dBm and is ideally suited
for direct use in combination with a 30-dB directional coupler. Additional low-pass filtering of
the output signal can be achieved by means of an external resistor and capacitor.
shows a detector with an additional output low pass filter. The
filter frequency is set with RS and CS.
shows a detector with an additional feedback low pass filter.
Resistor RP is optional and lowers the trans-impedance gain
(RTRANS). The filter frequency is set with
The device is active for Enable = High, otherwise it is in a low power consumption
shutdown mode. To save power and prevent discharge of an external filter capacitance, the output
(OUT) is high-impedance during shutdown.
For all available packages, see the orderable addendum at the
end of the data sheet.
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