Features • 40 dB linear in dB power detection range • Output voltage range 0.3 to 2V • Shutdown • Multi-band operation from 50 MHz to 3.5 GHz • 0.5 dB accurate temperature compensation • External configurable output filter bandwidth • 2.2 mm x 2.5 mm x 0.8 mm LLP 6 package Description 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 2.7V to 3.3V. 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 realized by means of an external resistor and capacitor. Figure (a) shows a detector with an additional output low pass filter. The filter frequency is set with RS and CS. Figure (b) shows a detector with an additional feedback low pass filter. Resistor RP is optional and will lower 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. The LMV221 power detector is offered in the small 2.2 mm x 2.5 mm x 0.8 mm LLP package. Applications • UMTS/CDMA/WCDMA RF power control • GSM/GPRS RF power control • PA modules • IEEE 802.11b, g (WLAN)

single application with output filter MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image single application with output filter	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheet

Title		Size	Date	Other Language
	LMV221 50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA	2947 Kbytes	28-Mar-08

Featured Application Notes

Title		Size	Date	Other Language
	AN-1766: Application Note 1766 Evaluation Board for the LMV221 Logarithmic Power Detector	335 Kbytes	19-Dec-07	日本語

More Application Notes

Title		Size	Date	Other Language
	AN-1804: Application Note 1804 LMV225/LMV226/LMV228 microSMD Evaluation Board	275 Kbytes	11-Mar-08
	AN-1817: Application Note 1817 LMV225/LMV228 LLP Evaluation Board	263 Kbytes	26-Mar-08
	AN-1375: Application Note 1375 Linear-In-dB RF Power Detector In W-CDMA User Equipment	670 Kbytes	14-Apr-05
	AN-1374: Application Note 1374 Use of LMV225 Linear-In-dB RF Power Detector In CDMA2000 1X and EV_DO Mobile Station and Access Terminal	941 Kbytes	14-Apr-05	中文
	AN-1438: Application Note 1438 A Simple Method to Reduce DC Power Consumption in CDMA RF Power Amplifiers Through the LMV225 and an Efficient Switcher	512 Kbytes	6-Jan-06	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMV221SD	BICMOS8B+	0	1152	0	0	743900	5	211083656
LMV221SDX	BICMOS8B+	0	1152	0	0	743900	5	211083656

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.