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Originally Posted by Incoherent
what does p-port pin 17 actually do?
Should I leave the DGND unconnected to the AGND?
Is it worth spreading the ground around the place?
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The control byte is at p-port address+2; /C0 is pin 1, /C1 is pin 14, C2 is pin 16, and /C3 is pin 17. I've no idea why three of the four are inverted.
I'd keep DGND as it is, but reserve the option of solder-bridging it to AGND if things are funky. (I learned that 'keep the options open' from you
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Widening the ground under the ADC would be cool, maybe even run a ground trace under it on the top layer. Large scale ground-pours? Eh, up to you. I don't think it'll make a measurable difference, but it won't hurt.