LM4901

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SNAS139F – DECEMBER 2001 – REVISED DECEMBER 2001

Single-Point Power / Ground Connections

The analog power traces should be connected to the digital traces through a single point (link). A "Pi-filter" can

be helpful in minimizing High Frequency noise coupling between the analog and digital sections. It is further

recommended to put digital and analog power traces over the corresponding digital and analog ground traces to

minimize noise coupling.

Placement of Digital and Analog Components

All digital components and high-speed digital signal traces should be located as far away as possible from analog

components and circuit traces.

Avoiding Typical Design / Layout Problems

Avoid ground loops or running digital and analog traces parallel to each other (side-by-side) on the same PCB

layer. When traces must cross over each other do it at 90 degrees. Running digital and analog traces at 90

degrees to each other from the top to the bottom side as much as possible will minimize capacitive noise

coupling and cross talk.

Copyright © 2001, Texas Instruments Incorporated

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