LMV221_16 Datasheet, PDF (1/48 Pages) Texas Instruments – LMV221 50-MHz to 3.5-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA

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LMV221
SNWS018D – DECEMBER 2006 – REVISED JUNE 2016
LMV221 50-MHz to 3.5-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA
1 Features
•1 2.7-V to 3.3-V Supply Voltage
• 40-dB Linear in dB Power Detection Range
• 0.3-V to 2-V Output Voltage Range
• Shutdown
• Multi-Band Operation from 50 MHz to 3.5 GHz
• 0.5-dB Accurate Temperature Compensation
• External Configurable Output Filter Bandwidth
• 2.5 mm × 2.2 mm × 0.8 mm 6-pin WSON
Package
2 Applications
• UMTS/CDMA/WCDMA RF Power Control
• GSM/GPRS RF Power Control
• PA Modules
• IEEE 802.11b, g (WLAN)
3 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 2.7 V to 3.3 V.
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 achieved by means of an external resistor and
capacitor. shows a detector with an additional output
low pass filter. The filter frequency is set with R_S and
C_S.
shows a detector with an additional feedback low
pass filter. Resistor R_P is optional and lowers 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 prevent discharge of an external filter
capacitance, the output (OUT) is high-impedance
during shutdown.
Typical Application: Output RC Low Pass Filter
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMV221
WSON (6)
2.50 mm × 2.20 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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Typical Application: Feedback (R)C Low Pass Filter
RF
PA
COUPLER
ANTENNA
RF
PA
COUPLER
ANTENNA
50 :
VDD
RFIN
2
1
OUT ^RS
6
LMV221
EN ₄
3 ^{5 REF}
GND
+
CS _ADC
-
Copyright © 2016, Texas Instruments Incorporated
50 :
VDD
RFIN
2
1
OUT
6
+
LMV221
RP
EN _{4 3 5} REF
GND
CP
ADC
-
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.