PSoC 5, 3 & 1 MCU

[Anonymous]

Hello Everyone,

   

I am testing and developing a little circuit that needs a 16bits VDAC, but I could only find a 8 bits VDAC component.

   

Can someone say some hint?

[odissey1]

        Daniel, what update speed are you looking for?   

[Anonymous]

At the moment I am not worried with speed but with resolution, so at start can be any speed.

[JoMe_264151]

Entering "vdac resolution" (without the quotes) into the keyword field at top of this page will give you something to read.

   

There is no VDAC with more than 8 bit resolution, but there are some techniques and examples on how to increase that.

       

Bob

[Anonymous]

I imagined what you had said but I would like to confirm that no component was being left behind in the PSoC Creator Catalog. I made a search, but I could not find any conclusive post about It. Thanks very much about this info!

[odissey1]

        Analog/DAC/Dithered VDAC (9 to 12 bits)   

[odissey1]

        All known "workarounds" with PSoC stop at 11-12 bits. To obtain true 16-bit resolution, you would have to add external DAC, something like this: http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,401,1103&Prod=PMOD-DA3   

[Anonymous]

I'll  consider this possibility. Thanks very much for the hint!

[odissey1]

this is Cypress Application Note covering the tricks to improve resolution of existing DAC

   

http://www.cypress.com/documentation/application-notes/an64275-psoc-3-and-psoc-5lp-getting-more-reso...

       

if you look on INL and DNL curves, there is only subliminal improvement over 8-bits. Your best bet is ADC Feedback DAC, which is the slowest one, but offers 12-bit. Maybe you  will be able to get a little further.

       

To get 16 bit I used to play with MAXREFDES24 4x16-bit dac industrial board from Maxim Integrated, which I can provide you with some (rather unpolished) code:

   

https://www.maximintegrated.com/en/design/reference-design-center/system-board/5839.html

[Anonymous]

For the moment I will consider using the VDAC8 component because it is simpler and I may have to worry with other parts to project know. Thank you!