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National Semiconductor Electronic Components Datasheet

LMV228 Datasheet

(LMV225 - LMV228) RF Power Detector

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LMV228 pdf
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March 2005
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.
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:
— 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)
Applications
n CDMA RF power control
n WCDMA RF power control
n CDMA2000 RF power control
n PA modules
Typical Application
LMV225
LMV226/LMV228
20076001
© 2005 National Semiconductor Corporation DS200760
20076046
www.national.com


National Semiconductor Electronic Components Datasheet

LMV228 Datasheet

(LMV225 - LMV228) RF Power Detector

No Preview Available !

LMV228 pdf
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
VDD - GND
ESD Tolerance (Note 2)
Human Body Model
Machine Model
Storage Temperature Range
6.0V Max
2000V
200V
−65˚C to 150˚C
Junction Temperature (Note 3)
Mounting Temperature
Infrared or convection (20 sec)
150˚C Max
235˚C
Operating Ratings (Note 1)
Supply Voltage
Temperature Range
RF Frequency Range
2.7V to 5.5V
−40˚C to +85˚C
450 MHz to 2 GHz
2.7 DC and AC Electrical Characteristics
Unless otherwise specified, all limits are guaranteed to VDD = 2.7V; TJ = 25˚C. Boldface limits apply at temperature extremes.
(Note 4)
Symbol
Parameter
Condition
Min
Typ
Max
Units
IDD Supply Current
Active Mode: RFIN/EN =
VDD (DC), No RF Input
Power Present
LMV225
LMV226
4.8 7
8
4.9 6.2
mA
8
LMV228
4.9 6.2
8
Shutdown: RFIN/EN = GND (DC), No
RF Input Power Present
0.44
4.5
µA
VLOW
EN Logic Low Input Level
(Note 6)
0.8 V
VHIGH
EN Logic High Input Level
(Note 6)
1.8 V
ton Turn-on-Time (Note 9)
No RF Input Power
Present, Output Loaded
with 10 pF
LMV225
LMV226
LMV228
2.1
1.2
1.7
µs
tr Rise Time (Note 7)
Step from no Power to 0
dBm Applied, Output
Loaded with 10 pF
Step from no Power to 15
dBm Applied, Output
Loaded with 10 pF
LMV225
LMV226
LMV228
4.5
1.8
4.8
µs
IEN Current into RFIN/EN Pin
PIN Input Power Range (Note 5) LMV225
1 µA
−30 dBm
0
−43 dBV
−13
LMV226
−15 dBm
15
−28 dBV
2
LMV228
−15 dBm
15
−28 dBV
2
www.national.com
2


Part Number LMV228
Description (LMV225 - LMV228) RF Power Detector
Maker National Semiconductor
Total Page 21 Pages
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