Capacitors across Vss and Vdd

[edeca]

So for micros it is usual to have a 0.1µF capacitor between Vdd and Vss. I'm working with an MCP1525 (voltage reference) and the datasheet specifies an optional 0.1µF capacitor across Vin.

For any 'precision' semiconductors, should I be using a separate capacitor as close to the component, or will one per circuit do?

I'm guessing one per component but any clarification would be great

 

[Sceadwian]

Depends on how much noise your system is producing. Extra decoupling on precision IC's is always a good idea if you don't mind the added cost or complexity. On a voltage reference I'd definitely recommend it.

 

[edeca]

Thanks. I'm making one board and not one million, so I don't mind the extra cost

 

[Willbe]

https://en.wikipedia.org/wiki/Decoupling_capacitor