bastos4321 said:The diference is the noise. The digital gnd is much more noiser that analog agnd, so they should not be mix up to avoid coupling from digital noise to analog.
Bastos
bastos4321 said:In IC design (inside chip) the decoulpling values avaible are very limitted so it does not work. You have to separate grounds.
Obviosly in discrete you can use good decoulpling and coexist only with one ground, but that is not the best way to do it.
Bastos
Kral said:STOIKOV,
Yes, the two grounds must be connected together at one point. In many ICs, such as A/D converters, the two grounds are brought out to separate pins on the IC package. In this case, the terms "analgo ground" and "digital ground" refer to internal functions of the chip. In this case, most manufacturers recommend that the two grounds be connected together at the chip, with as short a connection as possible.
Regards,
Kral
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