[SOLVED] DAC waveform generation in LTSpice

[neddie]

Does anybody know haw I can generate an 8bit dac waveform in LTSpice.
Sine wave would be fine , preferably variable frequency.
I'd like to be able to test different filters that could be used after an 8 bit dac.
I'm trying to avoid actually building a DAC in ltspice , just want the output waveform.
You could probably do it with a ridiculously long PWL file , but that is not really practical.
Cheers
Neddie

 

[crutschow]

Even if you get a DAC how will you generate the digital sine-wave values for the DAC input?

 

[FvM]

If you read the LTspice documentation and think a bit, you'll figure out how to implement a quantizer in behavioral code.

Hint: there are round(), floor() and ceil() functions available. You can implement effectively any digital signal processing algorithm in PSpice or LTspice.

 

[neddie]

Thanks.
Once you pointed me in the right direction it was fairly easy :0) Also found an
example from Helmut Sennewald , doing exactly what I need :0)

Here if anyone else is interested:
https://groups.google.com/forum/#!topic/sci.electronics.design/ng_o8f7UPWY

Helps when you know where to look.
Thanks again
Neddie