I really think this has more to do with the size of a pull up resistor on chip than anything else. I'm not an IC designer, but I do know that the way you make

I really think this has more to do with the size of a pull up resistor on chip than anything else. I'm not an IC designer, but I do know that the way you make a resistor on chip for an analog circuit is a snake like structure in silicon, much bigger than a transistor for digital logic. https://en.wikipedia.org/wiki/Integrated_circuit https://en.wikipedia.org/wiki/Integrated_circuit