Showing results for 
Search instead for 
Did you mean: 

PSoC™ Creator & Designer


Where do I find the WaveDAC8 component and how do I install it into the concept librayr?


Why was it not installed with 2.1?

4 Replies
Expert II

Have a look here there is a video and an app-note.To install the wavedac follow the procedure in the app-note exactly.





Esteemed Contributor

WaveDAC8 component not released in 2.1, one can speculate, like a number of


other components, that work on its functionality not complete, so not an "official"


module release yet for primetime.




If you want to "roll" your own, so's to speak, you simply fill a table with a periods


worth of waveform samples, and DMA it to a VDAC. Thats easy, and you can


fill the table with sine, cosine, ramp, tri, square, sin(x), sin(x)/x.....anything you






More sophisticated, is burst N cycles of waveform, with a programmable delay in between. Many


of todays programmable waveforms can be built. Because of VDAC settling time you are limited to ~


1 Mhz sample rate. If you use IDAC, its ~ 100 nS. So if sample table size is 20 samples, max freq for


VDAC is 50 Khz.




Some DDS reference material that might be of help -





Go to their website, much more ref material.




Regards, Dana.

Esteemed Contributor

One more set of comments on DDS waveform generation.




1) Jitter is related to not only the clock, but other interrupt related processes. So if


you use a timer, to set sample rate, with an ISR, you need to be concerned with jitter


of clock, and ISR machine behaviour and priority.




2) Table depth controls waveform "fidelity", reproduction, hence harmonic distortion.


There is at  least one paper, to the best of my limited knowledge, in IEEE archives, that


discusses this. Not public domain unless you are a member. I have used 32 entry sine


tables, and on a spectrum analyzer they are close to 40 db down on harmonics. Larger


table size diminishing returns/bit. As to be expected. I will go out on  a limb and state you


are not going to get 60 db perfromance in a PSOC solution. Unless lots of external filtering.




3) PSOC limited to 8 bit DAC, unless you resort to other techniques, like bit dithering, PWM generation,


etc.. Translate even lower max frequency generation capabilities.





Regards, Dana.

Esteemed Contributor

One correction, types of waveforms to generate, sin(x)/X should have been typed






Regards, Dana.