An ideal 10k resistor with 10k NTC and 12-bit A/D has a resolution of about 40 A/D values at 25C,
but only 8 A/D values per degree at 100C.
That's 10 and 2 values per degree at the above temps with a 10-bit A/D.
A digital DS18B20 has a constant 16 values per degree C over it's whole temp range.
Leo..