I’d like to use the CLKOUT functionality of the 328P to supply a 3.3V I²C device (AFE 4404). I’ll use level shifters (BSSS138) for the I²C and some other digital control lines to the AFE but what should I do with the CLKOUT signal? The I²C device is specified for MAX 3.6V on all digital inputs.
Using the same standard level shifter seems kind of wrong as I do not need bi-directionality and the BSS138-based solutions might be to slow?
I was wondering if anybody else came across a similar problem?
I probably will use an appropriate voltage divider and a good buffer amp (e.g. LT6220) but definitely will try to use the BSS138 level shifter when they arrive tomorrow just to verify the “general” assumption that these are to slow for HF.
What do you think?