Part Number:TPL0501-100
I have a question concerning digital potentiometer in general and referring specifically to the TPL0501.
See Page 7 of Datasheet:
The temperature coefficient in Potentiometer mode is above Code=80 extremely good (good matching). I don't understand why the matching is getting worse, when approaching small Code-Values. I especially don't understand why the TC is getting worse for small Codes, but not for large ones. Does that have to do with the internal switch-resistor architecture?
In my application I need a ratio of around 17:1, which means, that I would have to use DAC-Codes of around 7 to 15. In this region the matching is not good. What would happen with the curve, if I connect the "HA" Terminal to GND and the "LA" Terminal to +Vref and could therefore set the potentiometer Code to around 250? Would that help concerning TC, or would the curve change?
The datasheet on Page 8 states this is allowed:
