50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA


Product details


Frequency (Min) (MHz) 50 Frequency (Max) (MHz) 3000 Type Logarithmic Supply voltage (Min) (V) 2.7 Supply voltage (Max) (V) 3.3 Supply current (mA) 7.2 Number of channels (#) 1 Dynamic range (Typ) (dB) 40 open-in-new Find other RF power detectors

Package | Pins | Size

WSON (NGF) 6 6 mm² 2.2 x 2.5 open-in-new Find other RF power detectors


  • 2.7-V to 3.3-V Supply Voltage
  • 40-dB Linear in dB Power Detection Range
  • 0.3-V to 2-V Output Voltage Range
  • Shutdown
  • Multi-Band Operation from 50 MHz to 3.5 GHz
  • 0.5-dB Accurate Temperature Compensation
  • External Configurable Output Filter Bandwidth
  • 2.5 mm × 2.2 mm × 0.8 mm 6-pin WSON Package
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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 CP//CTRANS and RP//RTRANS.

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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Technical documentation

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Type Title Date
* Data sheet LMV221 50-MHz to 3.5-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA datasheet (Rev. D) Jun. 01, 2016
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guide Evaluation Board for the LMV221 Logarithmic Power Detector (Rev. A) Apr. 22, 2013

Design & development

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WSON (NGF) 6 View options

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