National Semiconductor LMV225, LMV226, LMV228 Technical data

August 2004

LMV225/LMV226/LMV228
RF Power Detector for CDMA and WCDMA in micro SMD

LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA in micro SMD

General Description

The LMV225/LMV226/LMV228 are 30dB RF power detec­tors 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 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 inte­grated 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 combi­nation with resistive taps. The LMV226/LMV228 have a de­tection 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 re­quirements.

The LMV225/LMV226/LMV228 power detectors are offered
in the small 1.0 mm x 1.0 mm X 0.6 mm micro SMD 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 micro SMD package 1.0 mm x 1.0 mm x 0.6 mm

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

20076046

© 2004 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

- GND 6.0V Max

V

DD

ESD Tolerance (Note 2)

Human Body Model 2000V

LMV225/LMV226/LMV228

Machine Model 200V

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

Storage Temperature Range −65˚C to 150˚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

I

DD

V

LOW

V

HIGH

t

on

t

r

I

EN

P

IN

Supply Current Active Mode: RFIN/EN=

(DC), No RF Input

V

DD

Power Present

LMV225 4.8 7

8

LMV226 4.9 6.2

8

LMV228 4.9 6.2

8

Shutdown: RF

= GND (DC), No

IN/EN

0.44 4.5 µA

RF Input Power Present

ENLogic Low Input Level

0.8 V

(Note 6)

ENLogic High Input Level

1.8 V

(Note 6)

Turn-on-Time (Note 9) No RF Input Power

LMV225 2.1
Present, Output Loaded
with 10pF

Rise Time (Note 7) Step from no Power to 0

LMV228 1.7

LMV225 4.5
dBm Applied, Output
Loaded with 10pF

Step from no Power to 15
dBm Applied, Output
Loaded with 10pF

LMV226 1.8

LMV228 4.8

Current into RFIN/ENPin 1 µA

Input Power Range (Note 5) LMV225 −30

0

−43

−13

LMV226 −15

15

−28
2

LMV228 −15

15

−28
2

mA

µsLMV226 1.2

µs

dBm

dBV

dBm

dBV

dBm

dBV

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2.7 DC and AC Electrical Characteristics (Continued)

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

Logarithmic Slope (Note 8) 900 MHz LMV225 44.0

LMV226 44.5

LMV228 44.0

1800 MHz LMV225 39.4

LMV226 41.6

V

I

R

e

OUT

n

OUT

OUT

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

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

Output Voltage No RF Input Power

LMV225 214 350

Present

LMV228 228 350

Output Current

LMV226 Only 4.5 5.3 mA

Sourcing/Sinking

Output Impedance LMV225/LMV228 only, no RF Input

19.8 29

Power Present

Output Referred Noise RF Input = 1800 MHz, −10 dBm for

700
LMV225 and 5 dBm for
LMV226/LMV228, Measured at
10 kHz

34

mV/dB

dBm

mVLMV226 223 350

nV/

LMV225/LMV226/LMV228

kΩ

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2.7 DC and AC Electrical Characteristics (Continued)

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

Variation Due to Temperature 900 MHz, RF

LMV225/LMV226/LMV228

= 0 dBm

IN

Referred to 25˚C

900 MHz, RF

= 15 dBm

IN

Referred to 25˚C

1800 MHz, RF

= 0 dBm

IN

Referred to 25˚C

1800 MHz, RFIN= 15 dBm
Referred to 25˚C

1900 MHz, RF

= 0 dBm

IN

Referred to 25˚C

1900 MHz, RF

= 15 dBm

IN

Referred to 25˚C

2000 MHz, RF

= 0 dBm

IN

Referred to 25˚C

2000 MHz, RF

= 15 dBm

IN

Referred to 25˚C

LMV225 +0.64

−1.07

LMV226 +0.05

−0.02

LMV228 +0.22

−0.36

LMV225 +0.09

−0.86

LMV226 +0.07

−0.10

LMV228 +0.29

−0.57

LMV225 +0

−0.69

LMV226 +0

−0.10

LMV228 +0.23

−0.64

LMV225 +0

−0.86

LMV226 +0

−0.29

LMV228 +0.27

−0.65

dB

5.0 DC and AC Electrical Characteristics

Unless otherwise specified, all limits are guaranteed to VDD= 5.0V; TJ= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)

Symbol Parameter Condition Min Typ Max Units

I

DD

V

LOW

V

HIGH

t

on

t

r

Supply Current Active Mode: RFIN/EN=

(DC), no RF Input

V

DD

Power Present.

Shutdown: RF

= GND (DC), no

IN/EN

RF Input Power Present.

ENLogic Low Input Level
(Note 6)

ENLogic High Input Level
(Note 6)

Turn-on-Time (Note 9) No RF Input Power

Present, Output Loaded
with 10pF

Rise Time (Note 7) Step from no Power to 0

dBm Applied, Output
Loaded with 10pF

Step from no Power to 15
dBm Applied, Output
Loaded with 10pF

LMV225 5.3 7.5

9

LMV226 5.3 6.8

9

LMV228 5.4 6.8

9

0.32 4.5 µA

0.8 V

1.8 V

LMV225 2.1

LMV228 1.7

LMV225 4.5

LMV226 1.4

LMV228 4.8

mA

µsLMV226 1.0

µs

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5.0 DC and AC Electrical Characteristics (Continued)

Unless otherwise specified, all limits are guaranteed to VDD= 5.0V; TJ= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)

Symbol Parameter Condition Min Typ Max Units

I

P

V

I

R

e

EN

IN

OUT

OUT

OUT

n

Current Into RFIN/ENPin 1 µA

Input Power Range (Note 5) LMV225 −30

dBm

0

−43

dBV

−13

LMV226 −15

dBm

15

−28

dBV

2

LMV228 −15

dBm

15

−28

dBV

2

Logarithmic Slope (Note 8) 900 MHz LMV225 44.6

LMV226 44.6

LMV228 44.2

1800 MHz LMV225 40.6

LMV226 42.2

LMV228 42.4

1900 MHz LMV225 39.6

mV/dB

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

LMV226 −25.0

LMV228 −27.7

1800 MHz LMV225 −48.5

LMV226 −25.7

LMV228 −28.9

1900 MHz LMV225 −48.2

dBm

LMV226 −25.6

LMV228 −28.7

2000 MHz LMV225 −48.9

LMV226 −25.5

LMV228 −28.7

Output Voltage No RF Input Power

Present

LMV225 222 400

mVLMV226 231 400

LMV228 244 400

Output Current

LMV226 Only 4.5 5.3 mA

Sourcing/Sinking

Output Impedance No RF Input Power Present 23.7 29

31

Output Referred Noise RF Input = 1800 MHz, −10 dBm for

700 nV/
LMV225 and 5 dBm for
LMV226/LMV228, Measured at
10 kHz

LMV225/LMV226/LMV228

kΩ

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5.0 DC and AC Electrical Characteristics (Continued)

Unless otherwise specified, all limits are guaranteed to VDD= 5.0V; TJ= 25˚C. Boldface limits apply at temperature extremes.
(Note 4)

Symbol Parameter Condition Min Typ Max Units

Variation Due to Temperature 900 MHz, RF

= 0 dBm

IN

Referred to 25˚C

900 MHz, RF

= 15 dBm

IN

Referred to 25˚C

LMV225/LMV226/LMV228

1800 MHz, RF
Referred to 25˚C

1800 MHz, RFIN= 15 dBm
Referred to 25˚C

1900 MHz, RF
Referred to 25˚C

1900 MHz, RF
Referred to 25˚C

2000 MHz RF
Referred to 25˚C

2000 MHz RF
Referred to 25˚C

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Human body model: 1.5 kΩ in series with 100 pF. Machine model, 0Ω in series with 100 pF.

Note 3: The maximum power dissipation is a function of T

(T

J(MAX)-TA

Note 4: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of
the device such that T

Note 5: Power in dBV = dBm + 13 when the impedance is 50Ω.

Note 6: All limits are guaranteed by design or statistical analysis

Note 7: Typical values represent the most likely parametric norm.

Note 8: Device is set in active mode with a 10 kΩ resistor from V

pin using a 100 pF coupling capacitor.

Note 9: Turn-on time is measured by connecting a 10 kΩ resistor to the RF
of resistor R

)/θJA. All numbers apply for packages soldered directly into a PC board

. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where T

J=TA

and capacitor C adds an additional delay.

2

, θJAand TA. The maximum allowable power dissipation at any ambient temperature is PD=

J(MAX)

DD

= 0 dBm

IN

= 0 dBm

IN

= 15 dBm

IN

= 0 dBm

IN

= 15 dBm

IN

to RFIN/EN. RF signal is applied using a 50Ω RF signal generator AC coupled to the RFIN/E

pin. Be aware that in the actual application on the front page, the RC-time constant

IN/EN

LMV225 +0.89

−1.16

LMV226 +0.25

−0.16

LMV228 +0.46

−0.62

LMV225 +0.3

−0.82

LMV226 +0.21

−0.09

LMV228 +0.55

−0.78

LMV225 +0.34

−0.63

LMV226 +0.21

−0.19

LMV228 +0.55

−0.93

LMV225 +0.22

−0.75

LMV226 +0.25

−0.34

LMV228 +0.61

−0.91

dB

>

TA.

J

N

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