LMH2100 Datasheet, PDF (1/49 Pages) National Semiconductor (TI) – 50 MHz to 4 GHz 40 dB Logarithmic Power Detector for CDMA and WCDMA

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LMH2100
SNWS020C – NOVEMBER 2007 – REVISED OCTOBER 2015
LMH2100 50-MHz to 4-GHz 40-dB Logarithmic Power Detector for CDMA and WCDMA
1 Features
•1 Supply Voltage: 2.7 V to 3.3 V
• Output Voltage: 0.3 V to 2 V
• 40-dB Linear in dB Power Detection Range
• Shutdown
• Multi-Band Operation from 50 MHz to 4 GHz
• 0.5-dB Accurate Temperature Compensation
• External Configurable Output Filter Bandwidth
• 0.4-mm Pitch DSBGA Package
2 Applications
• UMTS/CDMA/WCDMA RF Power Control
• GSM/GPRS RF Power Control
• PA Modules
• IEEE 802.11b, g (WLAN)
3 Description
The LMH2100 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
4 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 LMH2100 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. Typical Application: Output RC Low Pass
Filter shows a detector with an additional output low
pass filter. The filter frequency is set with R_S and C_S.
Typical Application: Feedback (R)C Low Pass Filter
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 prevent discharge of an external filter
capacitance, the output (OUT) is high-impedance
during shutdown.
Typical Application: Output RC Low Pass Filter
RF
PA
COUPLER
ANTENNA
50 :
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LMH2100
DSBGA (6)
1.274 mm × 0.874 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application: Feedback (R)C Low Pass
Filter
RF
PA
COUPLER
ANTENNA
VDD
RFIN
2
1
OUT ^RS
6
LMH2100
EN _{4 3 5} REF
GND
+
CS _ADC
-
50 :
VDD
RFIN
21
OUT
6
LMH2100
RP
EN _{4 3 5} REF
GND
+
CP
ADC
-
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.