Mid Reference Capacitor

[mportnoy]

Interesting discussion.

I've been using 85 c 1uf electrolytics in my design for the ref and mid caps. I haven't seen any issues with ADC or DAC conversion.

This is OT, but I managed to get the chip's noise performance below -100dB unweighted. I won't say exactly how low, but I will say that I don't have to use any external audio path filtration with the chip. My dev research showed that the FV-1 is sensitive to power supply noise (like all converters). Also, it sounds WAY better at 3.3v than it does at 3v.

The one thing I found that just drove me nuts during dev was fighting clock noise on power supply pins. Not sure if that's a normal issue? I resolved it eventually.

Anyway, just my 2 cents about the ref and mid caps.

[Sweetalk]

Interesting discussion.

I've been using 85 c 1uf electrolytics in my design for the ref and mid caps. I haven't seen any issues with ADC or DAC conversion.

This is OT, but I managed to get the chip's noise performance below -100dB unweighted. I won't say exactly how low, but I will say that I don't have to use any external audio path filtration with the chip. My dev research showed that the FV-1 is sensitive to power supply noise (like all converters). Also, it sounds WAY better at 3.3v than it does at 3v.

The one thing I found that just drove me nuts during dev was fighting clock noise on power supply pins. Not sure if that's a normal issue? I resolved it eventually.

Anyway, just my 2 cents about the ref and mid caps.

Can you make a separate post on your findings/recommendations?

[knutolai]

This is OT, but I managed to get the chip's noise performance below -100dB unweighted. I won't say exactly how low, but I will say that I don't have to use any external audio path filtration with the chip. My dev research showed that the FV-1 is sensitive to power supply noise (like all converters). Also, it sounds WAY better at 3.3v than it does at 3v.

The one thing I found that just drove me nuts during dev was fighting clock noise on power supply pins. Not sure if that's a normal issue? I resolved it eventually.

Would be very interesting indeed!

mportnoy's follow up thread can be found here:
http://www.spinsemi.com/forum/viewtopic ... 4612#p4612