LMH2110 Datasheet, PDF (1/4 Pages) National Semiconductor (TI) – 8 GHz Logarithmic RMS Power Detector with 45 dB Dynamic Range

LMH2110
PRODUCT BRIEF
January 7, 2010
8 GHz Logarithmic RMS Power Detector with 45 dB
Dynamic Range
General Description
The LMH2110 is a 45 dB Logarithmic RMS power detector
particularly suited for accurate power measurement of mod-
ulated 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 in-
sensitive 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 in-
tercept only, reducing calibration effort significantly. The de-
vice 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 di-
rectional 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 pre-
vent 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 mi-
croSMD package.
“Notice: This document is not a datasheet. For more in-
formation regarding this product or to order samples
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html.
Features
■ ^{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 microSMD package}
Applications
■ ^{Multi Mode, Multi band RF power control}
— GSM/EDGE
— CDMA/CDMA2000
— W-CDMA
— OFDMA
— LTE
■ ^{Infrastructure RF Power Control}
Typical Application
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