LMH2110 Datasheet, PDF (1/33 Pages) National Semiconductor (TI) – 8 GHz Logarithmic RMS Power Detector with 45 dB Dynamic Range

LMH2110
www.ti.com
SNWS022C – JANUARY 2010 – REVISED MARCH 2013
LMH2110 8 GHz Logarithmic RMS Power Detector with 45 dB dynamic range
Check for Samples: LMH2110
FEATURES
1
•2 Logarithmic Root Mean Square Response
• 45 dB Linear-in-dB Power Detection Range
• Multi-Band Operation from 50 MHz to 8 GHz
• LOG Conformance Better than ±0.5 dB
• Highly Temperature Insensitive, ±0.25 dB
• Modulation Independent Response, 0.08 dB
• Minimal Slope and Intercept Variation
• Shutdown Functionality
• Wide Supply Range from 2.7V to 5V
• Tiny 6-Bump DSBGA Package
APPLICATIONS
• Multi Mode, Multi Band RF Power Control
– GSM/EDGE
– CDMA/CDMA2000
– W-CDMA
– OFDMA
– LTE
• Infrastructure RF Power Control
DESCRIPTION
The LMH2110 is a 45 dB Logarithmic RMS power
detector particularly suited for accurate power
measurement of modulated RF signals that exhibit
large peak-to-average ratios, i.e. large variations of
the signal envelope. Such signals are encountered in
W-CDMA and LTE cell phones. The RMS
measurement topology inherently ensures a
modulation insensitive measurement.
The device has an RF frequency range from 50 MHz
to 8 GHz. It provides an accurate, temperature and
supply insensitive, output voltage that relates linearly
to the RF input power in dBm. The LMH2110's
excellent conformance to a logarithmic response
enables an easy integration by using slope and
intercept only, reducing calibration effort significantly.
The device operates with a single supply from 2.7V to
5V. The LMH2110 has an RF power detection range
from -40 dBm to 5 dBm and is ideally suited for use in
combination with a directional coupler. Alternatively a
resistive divider can be used as well.
The device is active for EN = 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 LMH2110 power detector is offered in a tiny 6-
bump DSBGA package.
Typical Application Circuit
RF
PA
COUPLER
ANTENNA
50:
V_DD
RF_IN
A1
B1
A2
LMH2110
OUT
EN C2
B2, C1
GND
ADC
Output Voltage and Log Conformance Error vs.
RF Input Power at 1900 MHz
2.4
3
2.0
2
1.6
-40°C _25°C
1
1.2
0
0.8
-1
85°C
0.4
-2
0.0
-40
-30 -20 -10
0
RF INPUT POWER (dBm)
-3
10
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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