I did a new test of the CV response for the AS3364. Connecting a 5V to the input, and a 0-2V (actually 5V but through a 33k/22k resistor divider at the CV input) saw wave connected to the CV gave the following output:
As we see, it has a confirmed "deadband" at the bottom, it doesn't start to get linear until about 250mV CV. Similarly, linearity breaks down again at the top, around 1.8V. Mind you, this is NOT distortion of the input SIGNAL, it's only the control that flats out, so it doesn't have too much of a consequence. If it becomes a problem it may be trimmed out in the CV generation.
This is for one chip only, I have not yet tested multiple to see if they respond differently. Nor have I done any temperature testing - after all, we're still dealing with an expo converter inside the chip, though I'm not sure if that is a problem.
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