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
20076001
LMV226/LMV228
20076046
March 2005
LMV225/LMV226/LMV228
RF
Power
Detector
for
CDMA
and
WCDMA
© 2005 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)
235°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
µs
LMV226
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
1
µA
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
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
44.0
1800 MHz
LMV225
39.4
LMV226
41.6
LMV228
41.9
1900 MHz
LMV225
38.5
LMV226
41.2
LMV228
41.6
2000 MHz
LMV225
38.5
LMV226
41.0
LMV228
41.2
Logarithmic Intercept (Note 8)
900 MHz
LMV225
-45.5
dBm
LMV226
-24.5
LMV228
-27.2
1800 MHz
LMV225
-46.6
LMV226
-25.1
LMV228
-28.2
1900 MHz
LMV225
-46.3
LMV226
-24.9
LMV228
-28.0
2000 MHz
LMV225
-46.7
LMV226
-24.7
LMV228
-28.0
V
OUT
Output Voltage
No RF Input Power
Present
LMV225
214
350
mV
LMV226
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
k
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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3
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
= 15 dBm
Referred to 25°C
LMV226
+0.05
-0.02
LMV228
+0.22
-0.36
1800 MHz, RF
IN
= 0 dBm
Referred to 25°C
LMV225
+0.09
-0.86
1800 MHz, RF
IN
= 15 dBm
Referred to 25°C
LMV226
+0.07
-0.10
LMV228
+0.29
-0.57
1900 MHz, RF
IN
= 0 dBm
Referred to 25°C
LMV225
+0
-0.69
1900 MHz, RF
IN
= 15 dBm
Referred to 25°C
LMV226
+0
-0.10
LMV228
+0.23
-0.64
2000 MHz, RF
IN
= 0 dBm
Referred to 25°C
LMV225
+0
-0.86
2000 MHz, RF
IN
= 15 dBm
Referred to 25°C
LMV226
+0
-0.29
LMV228
+0.27
-0.65
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
t
on
Turn-on-Time (Note 9)
No RF Input Power
Present, Output Loaded
with 10 pF
LMV225
2.1
µs
LMV226
1.0
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
1.4
LMV228
4.8
LMV225/LMV226/LMV228
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4
5.0 DC and AC Electrical Characteristics
(Continued)
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
EN
Current Into RF
IN
/E
N
Pin
1
µA
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
Logarithmic Slope (Note 8)
900 MHz
LMV225
44.6
mV/dB
LMV226
44.6
LMV228
44.2
1800 MHz
LMV225
40.6
LMV226
42.2
LMV228
42.4
1900 MHz
LMV225
39.6
LMV226
41.8
LMV228
42.2
2000 MHz
LMV225
39.7
LMV226
41.6
LMV228
41.8
Logarithmic Intercept (Note 8)
900 MHz
LMV225
-47.0
dBm
LMV226
-25.0
LMV228
-27.7
1800 MHz
LMV225
-48.5
LMV226
-25.7
LMV228
-28.9
1900 MHz
LMV225
-48.2
LMV226
-25.6
LMV228
-28.7
2000 MHz
LMV225
-48.9
LMV226
-25.5
LMV228
-28.7
V
OUT
Output Voltage
No RF Input Power
Present
LMV225
222
400
mV
LMV226
231
400
LMV228
244
400
I
OUT
Output Current
Sourcing/Sinking
LMV226 Only
4.5
5.3
mA
R
OUT
Output Impedance
No RF Input Power Present
23.7
29
31
k
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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