LMV225,LMV226,LMV228
LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
Literature Number: SNWS013K
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 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.
Features
n30 dB linear in dB power detection range
nOutput voltage range 0.2 to 2V
nLogic low shutdown
nMulti-band operation from 450 MHz to 2000 MHz
nAccurate temperature compensation
nPackages:
— 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)
Applications
nCDMA RF power control
nWCDMA RF power control
nCDMA2000 RF power control
nPA modules
Typical Application
LMV225
20076001
LMV226/LMV228
20076046
October 2006
LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA
© 2006 National Semiconductor Corporation DS200760 www.national.com
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
V
DD
- GND 6.0V Max
ESD Tolerance (Note 2)
Human Body Model 2000V
Machine Model 200V
Storage Temperature Range −65˚C to 150˚C
Junction Temperature (Note 3) 150˚C Max
Mounting Temperature, Infrared or convection (20 sec)
Tin/Lead 235˚C
Lead-Free 260˚C
Operating Ratings (Note 1)
Supply Voltage 2.7V to 5.5V
Temperature Range −40˚C to +85˚C
RF Frequency Range 450 MHz to 2 GHz
2.7 DC and AC Electrical Characteristics
Unless otherwise specified, all limits are guaranteed to V
DD
= 2.7V; T
J
= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)
Symbol Parameter Condition Min Typ Max Units
I
DD
Supply Current Active Mode: RF
IN
/E
N
=
V
DD
(DC), No RF Input
Power Present
LMV225 4.8 7
8
mA
LMV226 4.9 6.2
8
LMV228 4.9 6.2
8
Shutdown: RF
IN
/E
N
= GND (DC), No RF
Input Power Present
0.44 4.5 µA
V
LOW
E
N
Logic Low Input Level
(Note 6)
0.8 V
V
HIGH
E
N
Logic High Input Level
(Note 6)
1.8 V
t
on
Turn-on-Time (Note 9) No RF Input Power
Present, Output Loaded
with 10 pF
LMV225 2.1
µsLMV226 1.2
LMV228 1.7
t
r
Rise Time (Note 7) Step from no Power to
0 dBm Applied, Output
Loaded with 10 pF
LMV225 4.5
µs
Step from no Power to
15 dBm Applied, Output
Loaded with 10 pF
LMV226 1.8
LMV228 4.8
I
EN
Current into RF
IN
/E
N
Pin 1µA
P
IN
Input Power Range (Note 5) LMV225 −30
0
dBm
−43
−13
dBV
LMV226 −15
15
dBm
−28
2
dBV
LMV228 −15
15
dBm
−28
2
dBV
LMV225/LMV226/LMV228
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2.7 DC and AC Electrical Characteristics (Continued)
Unless otherwise specified, all limits are guaranteed to V
DD
= 2.7V; T
J
= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)
Symbol Parameter Condition Min Typ Max Units
Logarithmic Slope (Note 8) 900 MHz LMV225 44.0
mV/dB
LMV226 44.5
LMV228 uSMD 44.0
LMV228 LLP 48.5
1800 MHz LMV225 39.4
LMV226 41.6
LMV228 uSMD 41.9
LMV228 LLP 47.4
1900 MHz LMV225 38.5
LMV226 41.2
LMV228 uSMD 41.6
LMV228 LLP 46.6
2000 MHz LMV225 38.5
LMV226 41.0
LMV228 uSMD 41.2
LMV228 LLP 45.4
Logarithmic Intercept (Note 8) 900 MHz LMV225 −45.5
dBm
LMV226 −24.5
LMV228 uSMD −27.2
LMV228 LLP −23.7
1800 MHz LMV225 −46.6
LMV226 −25.1
LMV228 uSMD −28.2
LMV228 LLP −23.8
1900 MHz LMV225 −46.3
LMV226 −24.9
LMV228 uSMD −28.0
LMV228 LLP −23.7
2000 MHz LMV225 −46.7
LMV226 −24.7
LMV228 uSMD −28.0
LMV228 LLP -23.6
V
OUT
Output Voltage No RF Input Power
Present
LMV225 214 350
mVLMV226 223 350
LMV228 228 350
I
OUT
Output Current
Sourcing/Sinking
LMV226 Only 4.5 5.3 mA
R
OUT
Output Impedance LMV225/LMV228 only, no RF Input Power
Present
19.8 29
34
kΩ
e
n
Output Referred Noise RF Input = 1800 MHz, −10 dBm for
LMV225 and 5 dBm for LMV226/LMV228,
Measured at 10 kHz
700
nV/
LMV225/LMV226/LMV228
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2.7 DC and AC Electrical Characteristics (Continued)
Unless otherwise specified, all limits are guaranteed to V
DD
= 2.7V; T
J
= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)
Symbol Parameter Condition Min Typ Max Units
Variation Due to Temperature 900 MHz, RF
IN
= 0 dBm
Referred to 25˚C
LMV225 +0.64
−1.07
dB
900 MHz, RF
IN
=15dBm
Referred to 25˚C
LMV226 +0.05
−0.02
LMV228 uSMD +0.22
−0.36
LMV228 LLP +0.87
−0.87
1800 MHz, RF
IN
= 0 dBm
Referred to 25˚C
LMV225 +0.09
−0.86
1800 MHz, RF
IN
=15dBm
Referred to 25˚C
LMV226 +0.07
−0.10
LMV228 uSMD +0.29
−0.57
LMV228 LLP +1.04
−1.23
1900 MHz, RF
IN
= 0 dBm
Referred to 25˚C
LMV225 +0
−0.69
1900 MHz, RF
IN
=15dBm
Referred to 25˚C
LMV226 +0
−0.10
LMV228 uSMD +0.23
−0.64
LMV228 LLP +1.05
−1.45
2000 MHz, RF
IN
= 0 dBm
Referred to 25˚C
LMV225 +0
−0.86
2000 MHz, RF
IN
=15dBm
Referred to 25˚C
LMV226 +0
−0.29
LMV228 uSMD +0.27
−0.65
LMV228 LLP +1.04
−2.02
5.0 DC and AC Electrical Characteristics
Unless otherwise specified, all limits are guaranteed to V
DD
= 5.0V; T
J
= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)
Symbol Parameter Condition Min Typ Max Units
I
DD
Supply Current Active Mode: RF
IN
/E
N
=
V
DD
(DC), no RF Input
Power Present.
LMV225 5.3 7.5
9
mA
LMV226 5.3 6.8
9
LMV228 5.4 6.8
9
Shutdown: RF
IN
/E
N
= GND (DC), no RF
Input Power Present.
0.32 4.5 µA
V
LOW
E
N
Logic Low Input Level
(Note 6)
0.8 V
V
HIGH
E
N
Logic High Input Level
(Note 6)
1.8 V
LMV225/LMV226/LMV228
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