I am trying to use ADAU1401AEBZ board to design a modulator. I finish the AM modulator already, and try to design a FM modulator next. I usually use a VCO IC to design FM modulator. Is there any way i can do the same thing using SigmaStudio? I found the VCO in the software is very simple. I don't know how to modulate the message to the carrier. I think maybe i can change the VCO oscillating frequency and then add a message at the input pin of VCO. But i don't how to change the oscillating frequency.
Could you please teach me how to design FM modulation or give me some suggestion?