LMH2110_15 Datasheet, PDF (1/36 Pages) Texas Instruments – LMH2110 8-GHz Logarithmic RMS Power Detector with 45-dB Dynamic Range

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LMH2110
SNWS022D – JANUARY 2010 – REVISED JUNE 2015
LMH2110 8-GHz Logarithmic RMS Power Detector with 45-dB Dynamic Range
1 Features
•1 Wide Supply Range from 2.7 V to 5 V
• 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
• Tiny 6-Bump DSBGA Package
2 Applications
• Multi-Mode, Multi-Band RF Power Control
– GSM/EDGE
– CDMA/CDMA2000
– W-CDMA
– OFDMA
– LTE
• Infrastructure RF Power Control
space
3 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; that is, 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 device
has excellent conformance to a logarithmic response,
enabling easy integration by using slope and intercept
only, reducing calibration effort significantly. The
device operates with a single supply from 2.7 V to
5 V. 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.
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.
Typical Application Circuit
RF
PA
COUPLER
ANTENNA
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LMH2110
DSBGA (6)
1.27 mm × 0.87 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Output Voltage and Log Conformance Error vs.
RF Input Power at 1900 MHz
2.4
3
50 :
VDD
RFIN
A1
B1
A2
LMH2110
OUT
EN C2
B2, C1
GND
ADC
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
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.