NATIONAL SEMICONDUCTOR LMV225 LMV226 LMV228 Owner's Manual
Summary
These RF power detectors are essential integrated circuits designed for precise measurement of RF power in CDMA and WCDMA applications across the 450 MHz to 2 GHz spectrum. They feature a wide 30 dB linear detection range, multi-band capabilities, and temperature compensation, making them ideal for advanced wireless communication systems. The manual provides comprehensive electrical specifications, operational details, and application guidance for engineers specializing in cellular network infrastructure and RF power control design.
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August
LM 225/LM 226/LM ow er etector for and in icro
LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA in micro SMD General Description Features
The LMV225/LMV226/LMV228 are 30d B RF power detec- d B linear in d B power detection range tors intended for use in CDMA and WCDMA applications. Output voltage range 0.2 to 2V
The device has an RF frequency range from MHz to Logic low shutdown GHz. It provides an accurate temperature and supply com-
Multi-band operation from MHz to MHz
pensated output voltage that relates linearly to the RF input
Accurate temperature compensation
power in d Bm. The circuit operates with single supply from
micro SMD package 1.0 mm 1.0 mm 0.6 mm
2.7V to 5.5V. The LMV225/LMV226/LMV228 have an inte- grated filter for low-ripple average power detection of CDMA
Applications
signals with d B dynamic range. Additional filtering can be
applied using single external capacitor. CDMA RF power control The LMV225 has an RF power detection range from –30 WCDMA RF power control d Bm to d Bm and is ideally suited for direct use in combi- CDMA2000 RF power control
nation with resistive taps. The LMV226/LMV228 have de- PA modules tection range from –15 d Bm to d Bm and are intended for use in combination with directional coupler. The LMV226 is equipped with buffered output which makes it suitable for GSM, EDGE, GPRS and TDMA applications. The device is active for Enable HI, otherwise it is in 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 re- quirements. The LMV225/LMV226/LMV228 power detectors are offered in the small 1.0 mm 1.0 mm 0.6 mm micro SMD pack- age.
Typical Application
LMV225 LMV226/LMV228
National Semiconductor Corporation DS200760 www.national.com
Page Summary Contents For NATIONAL SEMICONDUCTOR LMV225 LMV226 LMV228 Owner's Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 20 |
| File Size | 649.05 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
What is the recommended supply voltage range for this detector?
The device operates with a single supply from 2.7V to 5.5V.
Which model should I use if I need direct CDMA power control?
The LMV225 has an RF power detection range of –30 dBm to 0 dBm and is suited for direct CDMA2000 RF power control.
What are the overall operational frequency limits?
The RF frequency range is specified from 450 MHz up to 2 GHz.
How does the device manage low-ripple average power detection?
It features an integrated filter for detecting signals, and external filtering can be applied using a single capacitor.