Features 30 dB linear in dB power detection range Output voltage range 0.2 to 2V Logic low shutdown Multi-band operation from 450 MHz to 2000 MHz Accurate temperature compensation Packages: micro SMD thin 1.0 mm x 1.0 mm x 0.6 mm micro SMD ultra thin 1.0 mm x 1.0 mm x 0.35 mm LLP 2.2 mm x 2.5 mm x 0.8 mm (LMV225 and LMV228) Description The LMV225/LMV226/LMV228 are 30 dB RF power detectors intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 450 MHz to 2 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 5.5V. The LMV225/LMV226/LMV228 have an integrated filter for low-ripple average power detection of CDMA signals with 30 dB dynamic range. Additional filtering can be applied using a single external capacitor. The LMV225 has an RF power detection range from -30 dBm to 0 dBm and is ideally suited for direct use in combination with resistive taps. The LMV226/LMV228 have a detection range from -15 dBm to 15 dBm and are intended for use in combination with a directional coupler. The LMV226 is equipped with a buffered output which makes it suitable for GSM, EDGE, GPRS and TDMA applications. The device is active for Enable = HI, otherwise it is in a low power consumption shutdown mode. During shutdown the output will be LOW. The output voltage ranges from 0.2V to 2V and can be scaled down to meet ADC input range requirements. The LMV225/LMV226/LMV228 power detectors are offered in the thin 1.0 mm x 1.0 mm x 0.6 mm micro SMD package and the ultra thin 1.0 mm x 1.0 mm x 0.35 mm micro SMD package. The LMV225 and the LMV228 are also offered in the 2.2 mm x 2.5 mm x 0.8 mm LLP package. Applications CDMA RF power control WCDMA RF power control CDMA2000 RF power control PA modules

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Parameters Values RF Frequency (MHz) 450-2000 Dynamic Range 30 dB Detector Power Range -15dBm to 15dBm Accuracy 1 dB Inputs/Outputs 1/1 Transfer Linear in dB Modulation Independent No Supply Min 2.7 Volt Supply Max 5 Volt Supply Current 4.9 mA Shut down Yes Detector External Coupler, Internal Det VCO Freq Range 0.4 to 2GHz Application CDMA,WCDMA,GSM,EDGE,GPRS,TDMA Channels 1 Channels Temperature Min -40 deg C Temperature Max 85 deg C PowerWise Yes

Datasheets

Title		Size	Date	Other Language
	LMV228 RF Power Detector for CDMA and WCDMA in micro SMD	1259 Kbytes	10-Oct-06

Application Notes

Title		Size	Date	Other Language
	AN-1817: Application Note 1817 LMV225/LMV228 LLP Evaluation Board	263 Kbytes	26-Mar-08
	AN-1804: Application Note 1804 LMV225/LMV226/LMV228 microSMD Evaluation Board	275 Kbytes	11-Mar-08
	AN-1375: Application Note 1375 Linear-In-dB RF Power Detector In W-CDMA User Equipment	670 Kbytes	14-Apr-05

Other Technical Documents

Title		Type	Date
	Optimize RF PA Efficiency to Increase Your Handset's Talk-time	External Article	2006-06-26

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMV228SD/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2000 DIGI-KEY Worldwide 2832 MOUSER Worldwide 1000 TAYLOR Americas 2000	$0.50 each at 1K+ pcs	reel of 1000
LMV228SDX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.50 each at 1K+ pcs	reel of 4500
LMV228TL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 951 MOUSER Worldwide 1000	$0.40 each at 1K+ pcs	reel of 250
LMV228TLX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.40 each at 1K+ pcs	reel of 3000
LMV228UR/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1000	$0.40 each at 1K+ pcs	reel of 250
LMV228URX/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.40 each at 1K+ pcs	reel of 3000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMV228.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV228 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMV228SDEVAL	Evaluation Board for the LMV228	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	N/A
Description: This board can be used to evaluate National Semiconductor`s LMV225/LMV228 RF detectors. These logarithmic power detectors are intended for use in CDMA and WCDMA applications. They have a 30 dB dynamic range and an RF frequency range from 450 MHz to 2 GHz. The LMV228 is designed to be used in combination with a directional coupler, while the LMV225 detector is especially suited for power measurements via a high-resistive tap as well as directional coupler. The LMV225/LMV228 have an integrated filter for low-ripple average power detection of CDMA signals. Additional filtering can be applied using a single external capacitor. Contents: Assembled Evaluation Board LMV228 Datasheet Application Note - AN-1817

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMV228TLEVAL	Evaluation Board for the LMV228 microSMD RF Detector	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	N/A
General Description: This board can be used to evaluate National Semiconductor`s LMV225/LMV226/LMV228 RF detectors. These logarithmic power detectors are intended for use in CDMA and WCDMA applications. They have a 30 dB dynamic range and an RF frequency range from 450 MHz to 2 GHz. The LMV226/LMV228 are designed to be used in combination with a directional coupler, while the LMV225 detector is especially suited for power measurements via a high-resistive tap as well as directional coupler. The LMV226 has an additional output voltage buffer and therefore a low output impedance. The LMV225/LMV226/LMV228 have an integrated filter for low-ripple average power detection of CDMA signals. Additional filtering can be applied using a single external capacitor. Contents: Fully assembled Evaluation Board LMV228 Datasheet AN-1804

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMV228SD/NOPB	11.721	LLP	6	1	260	Detail	N/A	N/A	XTT A89
LMV228SDX/NOPB	11.721	LLP	6	1	260	Detail	N/A	N/A	XTT A89
LMV228TL/NOPB	1.308	MICRO SMD	4	1	260	Detail	N/A	N/A	X I
LMV228TLX/NOPB	1.308	MICRO SMD	4	1	260	Detail	N/A	N/A	X I
LMV228UR/NOPB	.715	MICRO SMD	4	1	260	Detail	N/A	N/A	X I
LMV228URX/NOPB	.715	MICRO SMD	4	1	260	Detail	N/A	N/A	X I

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMV228.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV228 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A