Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Cyclone III, huge cap at VCCD_PLL

Hi All! Altera document "Cyclone® III Device Family Pin Connection Guidelines PCG-01003-1.0" says that 470 uF capacitor must be used at digital power of PLL (besides a lot of ceramic capacitor...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

--- Quote Start ---

Take a look at some of the schematics for Altera development kits.

--- Quote End ---

Yes, the present cyclone III Dev Kits are ignoring even most device manual suggestion about supply decoupling. You may want to do more.

It should be also mentioned, that the said AN583 is basically targetting to Stratix IV with 10 GBit transceivers rather than gentle Cyclone III.