NSC LMH2110 8 ghz logarithmic rms power detector with 45 db dynamic range Datasheet

8 GHz Logarithmic RMS Power Detector with 45 dB
Dynamic Range
General Description
Features
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 microSMD package.
“Notice: This document is not a datasheet. For more information regarding this product or to order samples
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html.
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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
30064804
© 2010 National Semiconductor Corporation
300648
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LMH2110 PRODUCT BRIEF
January 7, 2010
LMH2110
PRODUCT BRIEF
LMH2110
Connection Diagram
6-Bump mircoSMD
30064805
Top View
Pin Descriptions
microSMD
Power Supply
Name
Description
A1
VDD
Positive Supply Voltage.
C1
GND
Power Ground.
Power Ground. May be left floating in case grounding is not feasible.
B2
GND
Logic Input
C2
EN
Analog Input
B1
RFIN
RF input signal to the detector, internally terminated with 50Ω.
Output
A2
OUT
Ground referenced detector output voltage.
The device is enabled for EN = High, and in shutdown mode for EN = Low. EN should be
<2.5V for having low IEN. For EN >2.5V, IEN increases slightly, while device is still
functional. Absolute maximum rating for EN = 3.6V.
Ordering Information
Package
6–Bump microSMD
www.national.com
Part Number
LMH2110TM
LMH2110TMX
Package
Marking
P
Transport Media
250 Units Tape and Reel
3k Units Tape and Reel
2
NSC Drawing
Status
TMD06BBA
Released
LMH2110
Physical Dimensions inches (millimeters) unless otherwise noted
6-Bump microSMD
NS Package Number TMD06BBA
X1 = 0.840 ± 0.030 mm, X2 = 1.240 ± 0.030 mm, X3 = 0.600 ± 0.075 mm
3
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LMH2110 PRODUCT BRIEF
Notes
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