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LMV227 Datasheet

RF Power Detector

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July 2006
LMV227
Production RF Tested, RF Power Detector for CDMA and
WCDMA
General Description
The LMV227 is a 30 dB RF power detector 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 volt-
age that relates linearly to the RF input power in dBm. The
circuit operates with a single supply from 2.7V to 5V. The
LMV227 has an integrated filter for low-ripple average power
detection of CDMA signals with 30 dB dynamic range. Addi-
tional filtering can be applied using a single external capaci-
tor.
The LMV227 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 device is active for Enable =
HI, otherwise it goes into a low power consumption shut-
down 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 output
signal bandwidth can optionally be lowered externally as
well.
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
Applications
n CDMA RF power control
n WCDMA RF power control
n CDMA2000 RF power control
n PA modules
Typical Application
© 2006 National Semiconductor Corporation DS201181
20118101
www.national.com


National Semiconductor Electronic Components Datasheet

LMV227 Datasheet

RF Power Detector

No Preview Available !

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
6.0V Max
2000V
200V
Storage Temperature Range
Junction Temperature (Note 3)
Mounting Temperature
Infrared or convection (20 sec)
−65˚C to 150˚C
150˚C Max
235˚C
Operating Ratings (Note 1)
Supply Voltage
Temperature Range
2.7V to 5.5V
−40˚C to +85˚C
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.
4.9 7 mA
8
Shutdown: RFIN/EN = GND (DC), No
RF Input Power Present.
0.6 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
No RF Input Power Present
tr Rise Time (Note 7)
Step from No Power to 0 dBm Applied
IEN Current into RFIN/EN Pin
PIN Input Power Range (Note 5)
2.1 µs
4.5 µs
1 µA
0 dBm
-30
-43 dBV
-13
Logarithmic Slope (Note 8)
900 MHz
43.3
1800 MHz
43.9
1855 MHz
36 43.5 51 mV/dB
1900 MHz
44.0
2000 MHz
43.2
Logarithmic Intercept (Note 8) 900 MHz
−46.7
1800 MHz
−44.1
1855 MHz
−56 −44.3 −33 dBm
1900 MHz
−42.8
2000 MHz
−43.7
VOUT
ROUT
Output Voltage
Output Impedance
No RF Input Power Present
No RF Input Power Present
208 350 mV
20.3 29
k
34
en Output Referred Noise
RF Input = 1800 MHz, −10 dBm,
Measured at 10 kHz
700 nV/
Variation over Temperature
900 MHz, RFIN = 0 dBm Referred to
25˚C
+0.64
−1.07
1800 MHz, RFIN = 0 dBm Referred to
25˚C
1900 MHz, RFIN = 0 dBm Referred to
25˚C
+0.09
−0.86
+0
−0.69
dB
2000 MHz, RFIN = 0 dBm Referred to
25˚C
+0
−0.86
www.national.com
2


Part Number LMV227
Description RF Power Detector
Maker National Semiconductor
PDF Download

LMV227 Datasheet PDF






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