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Old 19th April 2015, 02:39 PM   #1
kinku is offline kinku  United States
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Default The plots froma custom DAC

What you guys think about the numbers?
sorry in order
dynamics,freuency response,cross talk,NOISE FLOOR
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File Type: png fr.png (5.7 KB, 130 views)
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File Type: png noise.png (8.2 KB, 132 views)
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Old 21st April 2015, 01:40 AM   #2
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What's the bin width in the FFTs? Power supply (60Hz) artifacts look a tad high.
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Old 23rd April 2015, 08:45 AM   #3
wwenze is online now wwenze  Singapore
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Can't remember if RMAA normalize everything relative to signal amplitude. I think it does.

The individual noise component amplitude is okay, but look at the summary number for noise level which gives a clearer picture of what happens when those add up. I'm guess roughly 100dB ish which is not remarkable but won't cause any puppies to die either.

The high number of spikes which are harmonics of each other suggest some digital noise or switching power supply.

Crosstalk is on the high side.

No THD graph provided but I can already see some 3rd and 5th harmonics in the DNR chart. So THD I'm guessing is really bad.

Frequency response wobbly suggesting some problem with your filter.
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