Mixed signals, grounding and bypass capacitors

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This is the second video in the TI Precision Labs - Op Amps series on PCB
layout for op amps and analog circuits. In this presentation, we discuss the
importance of separating analog and digital signals, proper grounding, and
bypass capacitor placement. Each topic in the lecture features an explanation
and at least one example.
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[@GiGaSzS]

There is so much controversial material about splitting Analog and Digital ground planes on the internet and universities. It is nice to see that Texas Instruments is confirming my findings about the issues created by splitting/cutting the planes.

[@BMM66666]

Don’t separate the analog ground and digital ground unless your are using an isolated ADC. The Altium designer consultant Zach Peterson has made many videos talking about it.

[@mxzhang8836]

How about the power supply connection? If for some reason, only one power connector can be used to provide both analog and digital power (For example, a USB powered audio DAC), with a LDO or ferrite bead to isolate between them. Assume the connector is located at the digital side, then the analog return current will flow in the digital ground. Is there any solution to this? Maybe add a isolation transformer like SN6505 to eliminate the return path?

[@cosminbel79]

In theory is quite simple and straight forward tehnique. In reality, when there are ICs which dissipate power, and also communication lines, the tehnique gets complicated. Not to mention that shape and size of the PCB is cutomer dictated..

[@asingh4152]

Why are small caps placed closer

[@pongpitwipasuramonton4092]

the smaller the mlcc cap, the betterthe high freq noise absorbtion.

[@caleb7799]

maybe clear your throat?