NSC LMV221SD, LMV221 Datasheet

December 2006

LMV221 50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA

General Description

The LMV221 is a 40 dB RF power detector intended for use in CDMA and WCDMA applications. The device has an RF frequency range from 50 MHz to 3.5 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 3.3V.

The LMV221 has an RF power detection range from −45 dBm to −5 dBm and is ideally suited for direct use in combination with a 30 dB directional coupler. Additional low-pass filtering of the output signal can be realized by means of an external resistor and capacitor. Figure (a) shows a detector with an additional output low pass filter. The filter frequency is set with RS and CS.

Figure (b) shows a detector with an additional feedback low pass filter. Resistor RP is optional and will lower the Trans impedance gain (R

TRANS

). The filter frequency is set with

CP//C

TRANS

and RP//R

TRANS

The device is active for Enable = High, otherwise it is in a low power consumption shutdown mode. To save power and prevent discharge of an external filter capacitance, the output (OUT) is high-impedance during shutdown.

The LMV221 power detector is offered in the small 2.2 mm x

2.5 mm x 0.8 mm LLP package.

Features

■

40 dB linear in dB power detection range

■

Output voltage range 0.3 to 2V

■

Shutdown

■

Multi-band operation from 50 MHz to 3.5 GHz

■

0.5 dB accurate temperature compensation

■

External configurable output filter bandwidth

■

2.2 mm x 2.5 mm x 0.8 mm LLP 6 package

Applications

■

UMTS/CDMA/WCDMA RF power control

■

GSM/GPRS RF power control

■

PA modules

■

IEEE 802.11b, g (WLAN)

Typical Application

(a) LMV221 with output RC Low Pass Filter

20173771

(b) LMV221 with feedback (R)C Low Pass Filter

20173704

LMV221 50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA

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

3.6V RF Input Input power 10 dBm DC Voltage 400 mV Enable Input Voltage VSS - 0.4V < V

< VDD + 0.4V

ESD Tolerance (Note 2) Human Body Model 2000V Machine Model 200V Charge Device Model 2000V Storage Temperature

Range −65°C to 150°C

Junction Temperature (Note 3) 150°C

Maximum Lead Temperature (Soldering,10 sec) 260°C

Operating Ratings (Note 1)

Supply Voltage 2.7V to 3.3V Temperature Range −40°C to +85°C RF Frequency Range 50 MHz to 3.5 GHz RF Input Power Range (Note 5) −45 dBm to −5 dBm

−58 dBV to −18 dBV

Package Thermal Resistance θ

(Note 3) 86.6°C/W

2.7 V DC and AC Electrical Characteristics

Unless otherwise specified, all limits are guaranteed to; TA = 25°C, VDD = 2.7V, RF input frequency f = 1855 MHz CW (Continuous Wave, unmodulated). Boldface limits apply at the temperature extremes (Note 4).

Symbol Parameter Condition Min

(Note 6)

Typ

(Note 7)

Max

(Note 6)

Units

Supply Interface

Supply Current Active mode: EN = High, no Signal

present at RFIN.

6.5

7.2 8.5

Shutdown: EN = Low, no Signal present at RFIN.

0.5 3

μA

EN = Low: PIN = 0 dBm (Note 8) 10

Logic Enable Interface

LOW

EN Logic Low Input Level (Shutdown mode)

0.6 V

HIGH

EN Logic High Input Level 1.1 V

Current into EN Pin 1

μA

RF Input Interface

Input Resistance 40 47.1 60

Ω

Output Interface

OUT

Output Voltage Swing From Positive Rail, Sourcing,

REF

= 0V, I

OUT

= 1 mA

16 40

From Negative Rail, Sinking, V

REF

= 2.7V, I

OUT

= 1 mA

14 40

OUT

Output Short Circuit Current Sourcing, V

REF

= 0V, V

OUT

= 2.6V 3

2.7

5.4

Sinking, V

REF

= 2.7V, V

OUT

= 0.1V 3

2.7

5.7

BW Small Signal Bandwidth No RF input signal. Measured from REF

input current to V

OUT

450 kHz

TRANS

Output Amp Transimpedance Gain

No RF Input Signal, from I

REF

to V

OUT

35 42.7 55

kΩ

SR Slew Rate Positive, V

REF

from 2.7V to 0V 3

2.7

4.1

V/µs

Negative, V

REF

from 0V to 2.7V 3

2.7

4.2

OUT

Output Impedance (Note 8)

No RF Input Signal, EN = High. DC measurement

0.6 5

Ω

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LMV221

Symbol Parameter Condition Min

(Note 6)

Typ

(Note 7)

Max

(Note 6)

Units

OUT,SD

Output Leakage Current in Shutdown mode

EN = Low, V

OUT

= 2.0V 21 300

500

RF Detector Transfer

OUT,MAX

Maximum Output Voltage PIN= −5 dBm (Note 8)

f = 50 MHz 1.67 1.76 1.83

f = 900 MHz 1.67 1.75 1.82

f = 1855 MHz 1.53 1.61 1.68

f = 2500 MHz 1.42 1.49 1.57

f = 3000 MHz 1.33 1.40 1.48

f = 3500 MHz 1.21 1.28 1.36

OUT,MIN

Minimum Output Voltage (Pedestal)

No input Signal 175

142

250 350

388

ΔV

OUT,MIN

Pedestal Variation over temperature

No Input Signal, Relative to 25°C −20 20 mV

ΔV

OUT

Output Voltage Range PIN from −45 dBm to −5 dBm (Note 8)

f = 50 MHz 1.37 1.44 1.52

f = 900 MHz 1.34 1.40 1.47

f = 1855 MHz 1.24 1.30 1.37

f = 2500 MHz 1.14 1.20 1.30

f = 3000 MHz 1.07 1.12 1.20

f = 3500 MHz 0.96 1.01 1.09

SLOPE

Logarithmic Slope (Note 8)

f = 50 MHz 39 40.5 42

mV/dB

f = 900 MHz 36.7 38.5 40

f = 1855 MHz 34.4 35.7 37.1

f = 2500 MHz 32.6 33.8 35.2

f = 3000 MHz 31 32.5 34

f = 3500 MHz 30 31.9 33.5

INT

Logarithmic Intercept (Note 8)

f = 50 MHz −50.4 −49.4 −48.3

dBm

f = 900 MHz −54.1 −52.8 −51.6

f = 1855 MHz −53.2 −51.7 −50.2

f = 2500 MHz −51.8 −50 −48.3

f = 3000 MHz −51.1 −48.9 −46.6

f = 3500 MHz −49.6 −46.8 −44.1

Turn-on Time (Note 8)

No signal at PIN, Low-High transition EN. V

OUT

to 90%

8 10

µs

Rise Time (Note 9) PIN = No signal to 0 dBm, V

OUT

from 10%

to 90%

2 12 µs

Fall Time (Note 9) PIN = 0 dBm to no signal, V

OUT

from 90%

to 10%

2 12 µs

Output Referred Noise (Note 9)

PIN = −10 dBm, at 10 kHz 1.5

µV/

Output referred Noise (Note 8)

Integrated over frequency band 1 kHz - 6.5 kHz

100 150

µV

RMS

PSRR Power Supply Rejection Ratio

(Note 9)

PIN = −10 dBm, f = 1800 MHz 55 60 dB

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LMV221

Symbol Parameter Condition Min

(Note 6)

Typ

(Note 7)

Max

(Note 6)

Units

Power Measurement Performance

Log Conformance Error (Note 8)

−40 dBm ≤ PIN ≤ −10 dBm

f = 50 MHz −0.60

−1.10

0.53 0.56

1.3

f = 900 MHz −0.70

−1.24

0.46 0.37

1.1

f = 1855 MHz −0.40

−1.1

0.48 0.24

1.1

f = 2500 MHz −0.43

−1.0

0.51 0.56

1.1

f = 3000 MHz −0.87

−1.2

0.56 1.34

1.6

f = 3500 MHz −1.73

−2.0

0.84 2.72

2.7

VOT

Variation over Temperature (Note 8)

−40 dBm ≤ PIN ≤ −10 dBm

f = 50 MHz −1.1 0.4 1.4

f = 900 MHz −1.0 0.38 1.27

f = 1855 MHz −1.1 0.44 1.31

f = 2500 MHz −1.1 0.48 1.15

f = 3000 MHz −1.2 0.5 0.98

f = 3500 MHz –1.2 0.62 0.85

1 dB

Measurement Error for a 1 dB input power step (Note 8)

−40 dBm ≤ PIN ≤ −10 dBm

f = 50 MHz −0.06 0.069

f = 900 MHz −0.056 0.056

f = 1855 MHz −0.069 0.069

f = 2500 MHz −0.084 0.084

f = 3000 MHz −0.092 0.092

f = 3500 MHz −0.10 0.10

10 dB

Measurement Error for a 10 dB input power step (Note 8)

−40 dBm ≤ PIN ≤ −10 dBm

f = 50 MHz −0.65 0.57

f = 900 MHz −0.75 0.58

f = 1855 MHz −0.88 0.72

f = 2500 MHz −0.86 0.75

f = 3000 MHz −0.85 0.77

f = 3500 MHz −0.76 0.74

Temperature Sensitivity

−40°C < TA < 25°C (Note 8)

−40 dBm ≤ PIN ≤ −10 dBm

f = 50 MHz −15 −7 1

mdB/°C

f = 900 MHz −13.4 −6 1.5

f = 1855 MHz −14.1 −5.9 2.3

f = 2500 MHz −13.4 −4.1 5.2

f = 3000 MHz −11.7 −1.8 8

f = 3500 MHz −10.5 0.5 1.2

Temperature Sensitivity 25°C < TA < 85°C (Note 8)

−40 dBm ≤ PIN ≤ −10 dBm

f = 50 MHz −12.3 −6.7 −1.1

mdB/°C

f = 900 MHz −13.1 −6.7 −0.2

f = 1855 MHz −14.7 −7.1 0.42

f = 2500 MHz −15.9 −7.6 0.63

f = 3000 MHz −18 −8.5 1

f = 3500 MHz −21.2 −9.5 2.5

Temperature Sensitivity

−40°C < TA < 25°C, (Note 8) PIN = −10 dBm

f = 50 MHz −15.8 −8.3 −0.75

mdB/°C

f = 900 MHz −14.2 −6 2.2

f = 1855 MHz −14.9 −7.4 2

f = 2500 MHz −14.5 −6.6 1.3

f = 3000 MHz −13 −4.9 3.3

f = 3500 MHz −12 −3.4 5.3

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LMV221

Symbol Parameter Condition Min

(Note 6)

Typ

(Note 7)

Max

(Note 6)

Units

Temperature Sensitivity 25°C < TA < 85°C, (Note 8) PIN = −10 dBm

f = 50 MHz −12.4 −8.9 −5.3

mdB/°C

f = 900 MHz −13.7 −9.4 −5

f = 1855 MHz −14.6 −10 −5.6

f = 2500 MHz −15.2 −10.8 −6.5

f = 3000 MHz −16.5 −12.2 −7.9

f = 3500 MHz −18.1 −13.5 −9

MAX

Maximum Input Power for ELC = 1 dB(Note 8)

f = 50 MHz −8.85 −5.9

dBm

f = 900 MHz −9.3 −6.1

f = 1855 MHz −8.3 −5.5

f = 2500 MHz −6 −4.2

f = 3000 MHz −5.4 −3.7

f = 3500 MHz −7.2 −2.7

MIN

Minimum Input Power for ELC = 1 dB (Note 8)

f = 50 MHz −40.3 −38.9

dBm

f = 900 MHz −44.2 −42.9

f = 1855 MHz −42.9 −41.2

f = 2500 MHz −40.4 −38.6

f = 3000 MHz −38.4 −35.8

f = 3500 MHz −35.3 −31.9

DR Dynamic Range for ELC = 1 dB

(Note 8)

f = 50 MHz 31.5 34.5

f = 900 MHz 34.4 38.1

f = 1855 MHz 34 37.4

f = 2500 MHz 33.8 36.1

f = 3000 MHz 32.4 34.8

f = 3500 MHz 26.2 32.7

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, applicable std. MIL-STD-883, Method 3015.7. Machine model, applicable std. JESD22–A115–A (ESD MM std of JEDEC). FieldInduced Charge-Device Model, applicable std. JESD22–C101–C. (ESD FICDM std. of JEDEC)

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

J(MAX)

, θJA. The maximum allowable power dissipation at any ambient temperature is

PD = (T

J(MAX)

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

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 TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ > TA.

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 as determined at the time of characterization. Actual typical values may vary over time and will

also depend on the application and configuration. The typical values are not tested and are not guaranteed on shipped production material.

Note 8: All limits are guaranteed by design and measurements which are performed on a limited number of samples. Limits represent the mean ±3–sigma values. The typical value represents the statistical mean value.

Note 9: This parameter is guaranteed by design and/or characterization and is not tested in production.

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LMV221

Connection Diagram

6-pin LLP

20173702

Top View

Pin Descriptions

LLP6 Name Description

Power Supply 1 V

Positive Supply Voltage

3 GND Power Ground

Logic Input 4 EN The device is enabled for EN = High, and brought to a low-power shutdown mode for

EN = Low.

Analog Input 2 RF

RF input signal to the detector, internally terminated with 50 Ω.

Output 5 REF Reference output, for differential output measurement (without pedestal). Connected to

inverting input of output amplifier.

6 OUT Ground referenced detector output voltage (linear in dB)

DAP GND Ground (needs to be connected)

Ordering Information

Package Part Number Package

Marking

Transport Media NSC Drawing Status

LLP-6

LMV221SD

A96

1k Units Tape and Reel

SDB06A Released

LMV221SDX 4.5k Units Tape and Reel

Block Diagram

20173703

LMV221

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LMV221

Typical Performance Characteristics Unless otherwise specified, V

= 2.7V,

TA = 25°C, measured on a limited number of samples.

Supply Current vs. Supply Voltage

20173705

Supply Current vs. Enable Voltage

20173708

Output Voltage vs. RF input Power

20173712

Log Slope vs. Frequency

20173746

Log Intercept vs. Frequency

20173749

Output Voltage vs. Frequency

20173713

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LMV221