Analog power for digital ICs

[spman]

Hi

Some digital ICs (such as PHY) have multiple powers; analog and digital
I have seen in schematics that the power of circuit (for example output of a regulator) is directly given to digital power of IC and also after passing from a inductor is given to analog power.

What characteristics should have analog and digital powers?
Why these ICs have separated powers?
What does the inductor do?
What will happen if the inductor is not used? Won't work properly?

Regards

 

[karthiks30]

Hi,

I hope this information is helpful to you..

As far I know the sole purpose of using Inductor is used to produce stable current( assume as a filter) by smoothening current if there is any peak overshoots.

Though in schematic it looks like a two different powers(analog and digital), internally both will be shorted in the PCB, but the analog and digital grounds are provided differently to avoid the noises for the digital sources.

As power supply current may vary the inductor is used in series with the supply. It works even without inductor but its better be on the safer side since it may damage the circuits..