Honored ContributorHi,
Im trying to drive a resistor ladder DAC from my DE-1 SOC board, despite of my DAC being very accurate im getting somewhat shotty results. The setup is relatively simple driving the resistors directly from the board. Right now im using plain old 3.3v ttl to drive it. I was wondering what output standard is best used, and if I can drive Z to it without any troubles? Kind Regards, Camper.
Honored ContributorI was looking at another board that may be better at these things. So if I understand correctly even if I get a Max10 device, and it is seemingly better at disabling pullup resistance.
It will not do the job of having it's pins in total isolation? I had a little test disabling bus hold and weak pull ups, dont know if it looks consistent with having a 110k pullup? https://alteraforum.com/forum/attachment.php?attachmentid=15364&stc=1 https://alteraforum.com/forum/attachment.php?attachmentid=15365&stc=1Honored ContributorThanks for the help, the advice you gave me i'm going to check up on that, its awesome!
--- Quote Start --- Note each bit is driven to either LOW (ie, 0V) or HIGH (ie, 3.3V). 'Z' high impedance value is not required, so I don't understand how/why that originally came into the picture. --- Quote End --- I dont really think this board was actually doing the right thing here, it would be cool to have such a state. Maybe only for audio? You are right tho, it doesnt have to be bidirectional. I had a rail going at 0,05%, using R2R, found the busses on my GPIO connector drive pretty well, the voltages are pretty consistent along the bus. "opportunism I guess".
