LMV221SD

• 40 dB linear dB power detection range
• The output voltage range is 0.3 to 2V
• Shutdown
• Multiband operation from 50 MHz to 3.5 GHz
• 0.5 dB accurate temperature compensation
• Externally configured output filter bandwidth
• 2.2mm x 2.5mm x 0.8mm LLP 6 package

illustrate

The LMV221 is a 40dB RF power detector used in CDMA and WCDMA applications. The device has an RF frequency range from 50 MHz to 3.5 GHz. It provides an accurate linear relationship between temperature and power supply compensation for output voltage in dBm of RF input power. The circuit operates from a single 2.7V to 3.3V supply.

The LMV221's RF power range from -45 dBm to -5 dBm makes it ideal for direct use with a 30 dB directional coupler in combination with a 30 dB directive coupler. Additional low-pass filtered output signals can be passed through external resistors and capacitors. Figure (a) shows a detector with an additional output low-pass filter. The filter frequency is set with R_Sand_CS。

Figure (b) shows an additional feedback low-pass filter detector. resistor_RP is optional and reduces the transimpedance gain (R_TRANS）。 The filter frequency is set to_CP / / C_TRANSand R_P/ / R_TRANS。

The device is active enabled = high, otherwise it is in a low-power shutdown mode. To conserve power and prevent the external filter capacitor from discharging, the output (OUT) is shut down when the impedance is high.

The power detector LMV221 is available in a small 2.2mm x 2.5mm x 0.8mm LLP package.

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• UMTS/CDMA/WCDMA RF power control
• GSM/GPRS RF power control
• PA module
• IEEE 802.11b, G (WLAN)