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LMV221SD Datasheet

  • LMV221SD

  • National Semiconductor [50 MHz to 3.5 GHz 40 dB Logarithmic...

  • NSC

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LMV221 50 MHz to 3.5 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA
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 ac-
curate 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 鈭?5 dBm
to 鈭? 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
R
S
and C
S
.
Figure (b) shows a detector with an additional feedback low
pass filter. Resistor R
P
is optional and will lower the Trans
impedance gain (R
TRANS
). The filter frequency is set with
C
P
//C
TRANS
and R
P
//R
TRANS
.
The device is active for Enable = High, otherwise it is in a low
power consumption shutdown mode. To save power and pre-
vent 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
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
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
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
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
(b) LMV221 with feedback (R)C Low Pass Filter
20173771
20173704
漏 2007 National Semiconductor Corporation
201737
www.national.com

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