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36V DPOT

Posted: Tue Feb 26, 2019 11:54 am
by JR.
http://ww1.microchip.com/downloads/en/D ... 05304A.pdf

Last time I designed with DPOT they did not have 36V capability.

50 pages of data but no linearity curves.

JR

Re: 36V DPOT

Posted: Tue Feb 26, 2019 12:24 pm
by mediatechnology
Nice part if it's clean.

I suppose we need to buy an evaluation board and test it.

Re: 36V DPOT

Posted: Fri Mar 01, 2019 12:55 pm
by lsburden
Look at section 5.1.2 Step Resistance. There may not be any linearity curves but there are step resistance specs.

I have been looking at the AD5292. I was hoping to use them as I would a mechanical pot but so far am not happy with the distortion. I have also considered the MCP45HVX1 but I doubt its distortion would be any better, the AD5292 touts low distortion...
Unless I am doing something wrong I am not looking to use digi-pots directly in an audio path.

On a side note, I have used the THAT5171 and 5173 with phenomenal results. My initial expectations with digi-pots were based on experience with the THAT devices. Needless to say I was very disappointed.

Re: 36V DPOT

Posted: Fri Mar 01, 2019 1:37 pm
by mediatechnology
lsburden wrote:
Fri Mar 01, 2019 12:55 pm
On a side note, I have used the THAT5171 and 5173 with phenomenal results.
I have too. Somewhere I have a schematic of a simple U-pad attenuator I made with a 5173 and its distortion was at my residual levels.

This is the Universal Input I made with one where the 517X works as a pad ahead of the mic preamp and then gets flipped to make it switch from attenuation to gain fluidly. viewtopic.php?f=6&t=514

Image
A Universal Input Using the THAT1570 and 5173.

Re: 36V DPOT

Posted: Fri Mar 01, 2019 2:37 pm
by lsburden
that's pretty slick