LMV225TL National Semiconductor Corporation, LMV225TL Datasheet

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LMV225TL

Manufacturer Part Number
LMV225TL
Description
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2005 National Semiconductor Corporation
LMV225/LMV226/LMV228
RF Power Detector for CDMA and WCDMA
General Description
The LMV225/LMV226/LMV228 are 30 dB RF power detec-
tors 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 com-
pensated 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 inte-
grated 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 combi-
nation with resistive taps. The LMV226/LMV228 have a de-
tection 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 re-
quirements.
The LMV225/LMV226/LMV228 power detectors are offered
in the small 1.0 mm x 1.0 mm X 0.6 mm micro SMD pack-
age. The LMV225 and the LMV228 are also offered in the
2.2 mm x 2.5 mm x 0.8 mm LLP package.
Typical Application
LMV225
DS200760
20076001
Features
n 30 dB linear in dB power detection range
n Output voltage range 0.2 to 2V
n Logic low shutdown
n Multi-band operation from 450 MHz to 2000 MHz
n Accurate temperature compensation
n Packages:
Applications
n CDMA RF power control
n WCDMA RF power control
n CDMA2000 RF power control
n PA modules
— micro SMD package 1.0 mm x 1.0 mm x 0.6 mm
— LLP package 2.2 mm x 2.5 mm x 0.8 mm (LMV225
and LMV228)
LMV226/LMV228
www.national.com
March 2005
20076046

Related parts for LMV225TL

LMV225TL Summary of contents

Page 1

... X 0.6 mm micro SMD pack- age. The LMV225 and the LMV228 are also offered in the 2 2 0.8 mm LLP package. Typical Application LMV225 © 2005 National Semiconductor Corporation Features linear in dB power detection range n Output voltage range 0 Logic low shutdown ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage V - GND DD ESD Tolerance (Note 2) Human Body Model Machine Model Storage Temperature Range 2.7 ...

Page 3

DC and AC Electrical Characteristics Unless otherwise specified, all limits are guaranteed to V (Note 4) Symbol Parameter Logarithmic Slope (Note 8) Logarithmic Intercept (Note 8) V Output Voltage OUT I Output Current OUT Sourcing/Sinking R Output Impedance OUT ...

Page 4

DC and AC Electrical Characteristics Unless otherwise specified, all limits are guaranteed to V (Note 4) Symbol Parameter Variation Due to Temperature 5.0 DC and AC Electrical Characteristics Unless otherwise specified, all limits are guaranteed to V (Note 4) ...

Page 5

DC and AC Electrical Characteristics Unless otherwise specified, all limits are guaranteed to V (Note 4) Symbol Parameter I Current Into RF /E Pin Input Power Range (Note 5) IN Logarithmic Slope (Note 8) Logarithmic ...

Page 6

DC and AC Electrical Characteristics Unless otherwise specified, all limits are guaranteed to V (Note 4) Symbol Parameter Variation Due to Temperature Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings ...

Page 7

... Output B2 6 Ordering Information Package Part Number LMV225TL 4-Bump micro SMD LMV225TLX LMV225SD 6-pin LLP LMV225SDX LMV226TL LMV226TLX 4-Bump micro SMD LMV228TL LMV228TLX LMV228SD 6-pin LLP LMV228SDX Note: This product is offered both with leaded and lead free bumps. 20076002 ...

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Block Diagrams www.national.com 20076064 LMV225 20076049 LMV226 20076047 LMV228 8 ...

Page 9

Typical Performance Characteristics Supply Current vs. Supply Voltage (LMV225) Supply Current vs. Supply Voltage (LMV228) Output Voltage vs. RF Input Power (LMV226) Unless otherwise specified, V Supply Current vs. Supply Voltage (LMV226) 20076004 Output Voltage vs. RF Input Power (LMV225) ...

Page 10

Typical Performance Characteristics 25˚C. (Continued) Output Voltage and Log Conformance vs. RF Input Power @ 900 MHz (LMV225) Output Voltage and Log Conformance vs. RF Input Power @ 900 MHz (LMV228) Output Voltage and Log Conformance vs. RF Input Power ...

Page 11

Typical Performance Characteristics 25˚C. (Continued) Output Voltage and Log Conformance vs. RF Input Power @ 1900 MHz (LMV225) Output Voltage and Log Conformance vs Input Power 1900 MHz (LMV228) Output Voltage and Log Conformance vs Input ...

Page 12

Typical Performance Characteristics 25˚C. (Continued) Logarithmic Slope vs. Frequency (LMV225) Logarithmic Slope vs. Frequency (LMV228) Logarithmic Intercept vs. Frequency (LMV226) www.national.com Unless otherwise specified, V Logarithmic Slope vs. Frequency (LMV226) 20076010 Logarithmic Intercept vs. Frequency (LMV225) 20076040 Logarithmic Intercept vs. ...

Page 13

Typical Performance Characteristics 25˚C. (Continued) Output Variation vs. RF Input Power Normalized to 25˚C @ 900 MHz (LMV225) Output Variation vs. RF Input Power Normalized to 25˚C @ 900 MHz (LMV228) Output Variation vs. RF Input Power Normalized to 25˚C ...

Page 14

Typical Performance Characteristics 25˚C. (Continued) Output Variation vs. RF Input Power Normalized to 25˚C @ 1900 MHz (LMV225) Output Variation vs. RF Input Power Normalized to 25˚C @ 1900 MHz (LMV228) Output Variation vs. RF Input Power Normalized to 25˚C ...

Page 15

Typical Performance Characteristics 25˚C. (Continued) PSRR vs. Frequency (LMV225 , LMV226 and LMV228 in microSMD) RF Input Impedance vs. Frequency Reactance (LMV225, LMV226 and LMV228 in micro SMD) Unless otherwise specified, V 20076023 @ Resistance and RF Input Impedance vs. ...

Page 16

Application Notes CONFIGURING A TYPICAL APPLICATION The LMV225/LMV226/LMV228 are power detectors in- tended for CDMA and WCDMA applications. Power applied at its input translates voltage on the output through a linear-in-dB response. The LMV225 detector is especially ...

Page 17

Application Notes (Continued) number. The goal is to have a magnitude transfer, which is sufficiently flat in the used frequency range; capacitor C should be chosen significantly larger than capacitor C assure a proper performance of the high resistive tap. ...

Page 18

Application Notes (Continued) FIGURE 5. V vs. RF Input Power P OUT The output voltage variation ∆V OUT input signals that fall within the linear range (in dB) of the detector. In other words, the output variation is independent of ...

Page 19

Application Notes (Continued) FIGURE 8. Gain Cell All gain cell outputs are AM-demodulated with a peak detec- tor and summed together. This results in a logarithmic func- tion. The logarithmic range is about: 20 · n · log (A) where, ...

Page 20

Physical Dimensions NOTES: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. FOR SOLDER BUMP COMPOSITION, SEE “SOLDER INFORMATION” IN THE PACKAGE SECTION OF THE NATIONAL SEMICONDUCTOR WEB PAGE (www.national.com). 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN A1 IS ESTABLISHED ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry ...

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