I'm working on a transmitter that sends two AC current waveforms (bandwidth of a few kHz) over the power line, using two FM carriers in the 400-600kHz range. (Low latency is one of the big goals, hence why I didn't go for a digital encoding scheme.) I built a test circuit for the 74LV4046A, but found that the output has a lot of jitter even with the VCO input biased to a steady 2.5V.
I found this post claiming that the original CD4046 is superior to the 74HC4046, at least as far as the VCO is concerned:
https://groups.google.com/forum/#!topic/sci.electronics.cad/j1gD_xiz-rEI'm assuming that's because, in general, older processes are better for analog circuits while the opposite is true for digital. Would I be correct in assuming the 74LV4046A would still be inferior to the CD4046? (I have some CD4046 on order but it would be a while before they show up.)
Or would I be better off with some other VCO/PLL circuit? Or even a completely different modulation scheme?