RoHS Compliance Information	Size in Kbytes	Date
LMV221 50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA	2947 Kbytes	28-Mar-08	Download

Part Number

Package

Factory Lead Time

Models

Samples & Electronic Orders

Budgetary Pricing

Std Pack Size

Package Marking Format

Type

Pins

Spec.

MSL Rating

Peak Reflow

RoHS Report

CAD Symbols

Weeks

Qty

Qty

$US each

LMV221EVAL

LMV221 Logarithmic Power Detector Evaluation Board

Full production

N/A

1+

$99.00

1

-

N/A

N/A

LMV221SD

LLP

6

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.00

reel of 1000

XTT A96

6 weeks

N/A

LMV221SDX

LLP

6

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.00

reel of 4500

XTT A96

8 weeks

N/A

General 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 R_S and C_S.

Figure (b) shows a detector with an additional feedback low pass filter. Resistor R_P is optional and will lower the Trans impedance gain (R_TRANS). The filter frequency is set with C_P//C_TRANS and R_P//R_TRANS.

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.

Application Notes

Title	Size in Kbytes	Date
AN-1766: Application Note 1766 Evaluation Board for the LMV221 Logarithmic Power Detector	335 Kbytes	19-Dec-07	Download
AN-1766 (Japanese): Application Note 1766 Evaluation Board for the LMV221 Logarithmic Power Detector	254 Kbytes

More Application Notes

Title	Size in Kbytes	Date
AN-1804: Application Note 1804 LMV225/LMV226/LMV228 microSMD Evaluation Board	275 Kbytes	11-Mar-08	Download
AN-1817: Application Note 1817 LMV225/LMV228 LLP Evaluation Board	263 Kbytes	26-Mar-08	Download
AN-1375: Application Note 1375 Linear-In-dB RF Power Detector In W-CDMA User Equipment	670 Kbytes	14-Apr-05	Download
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	Download
AN-1374 (Chinese): Application Note 1374 Use of LMV225 Linear-In-dB RF Power Detector In CDMA2000 1X and EV_DO Mobile Station and Access Terminal	506 Kbytes
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	Download
AN-1438 (Chinese): Application Note 1438 A Simple Method to Reduce DC Power Consumption in CDMA RF Power Amplifiers Through the LMV225 and an Efficient Switcher	319 Kbytes