LMH2110_15 Datasheet, PDF (29/36 Pages) Texas Instruments – LMH2110 8-GHz Logarithmic RMS Power Detector with 45-dB Dynamic Range

www.ti.com
LMH2110
SNWS022D – JANUARY 2010 – REVISED JUNE 2015
9 Power Supply Recommendations
The LMH2110 is designed to operate from an input voltage supply range between 2.7 V to 5 V. This input
voltage must be well regulated. Enable voltage levels lower than 400 mV below GND could lead to incorrect
operation of the device. Also, the resistance of the input supply rail must be low enough to ensure correct
operation of the device.
10 Layout
10.1 Layout Guidelines
As with any other RF device, pay close careful attention to the board layout. If the board layout is not properly
designed, performance might be less then can be expected for the application.
The LMH2110 is designed to be used in RF applications, having a characteristic impedance of 50 Ω. To achieve
this impedance, the input of the LMH2110 needs to be connected via a 50-Ω transmission line. Transmission
lines can be created on PCBs using microstrip or (grounded) coplanar waveguide (GCPW) configurations.
In order to minimize injection of RF interference into the LMH2110 through the supply lines, the PCB traces for
VDD and GND must be minimized for RF signals. This can be done by placing a small decoupling capacitor
between the VDD and GND. It must be placed as close as possible to the VDD and GND pins of the LMH2110.
10.2 Layout Example
Figure 56. LMH2110 Layout
Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links: LMH2110
Submit Documentation Feedback
29