Electronics > Projects, Designs, and Technical Stuff
2.2uF C0G/NP0
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MagicSmoker:
Since the OP's question has been answered, note that there are C0G caps rated for up to 330n and 100V that only cost $5.78 on Mouser:

https://www.mouser.com/ProductDetail/KEMET/C2220C334J1GACTU?qs=sGAEpiMZZMs7ZEmUmaUL0%252BHfn%252BkysyX5xyIpm1WOce8%3D

ZaphodBeeblebrox:

--- Quote from: blueskull on October 28, 2019, 04:10:10 am ---Replace with polymer caps. Only better, nothing worse, at least for audio DC blocking.

--- End quote ---

There is this thing about leakage current you might want to consider...
fabiodl:
It is "funny" that in their schematic/bom they use x7r and not c0g even for the low pass output filter
floobydust:
It's better C0G as they have lower dielectric absoption, critical in say a reconstruction filter, but not as much here because the DAC's output impedance and 470R resistor work around it.
Signal distortion from high-K ceramic capacitors
Maxim AN4333 only looks at X7R, Y5V and the low freq. <300Hz gets badly distorted.

The eval boards are usually to play with developing S/W and few have test results showing it actually achieves 24-bit resolution with low noise. +3.3VA also powers the DAC IC's
VD digital portion which might not be ideal.
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