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Altera_Forum's avatar
Altera_Forum
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8 years ago

Driving Ladder DAC

Hi, 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 resis...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Thanks for the help, the advice you gave me i'm going to check up on that, its awesome!

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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.

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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".