To achieve temperature measurement accuracy of 0.1°C over a range of 100°C, which ADC resolution is required?

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Multiple Choice

To achieve temperature measurement accuracy of 0.1°C over a range of 100°C, which ADC resolution is required?

Resolution determines how finely an ADC can distinguish input changes. To measure temperature with 0.1°C precision over a 100°C span, you need about 1000 distinct steps (100°C / 0.1°C). An N-bit ADC provides 2^N possible codes. The smallest N that yields at least 1000 steps is 10, since 2^10 = 1024, which gives a step of roughly 0.0977°C over 100°C. An 8-bit ADC offers only 256 levels (too coarse), while 16-bit or 32-bit ADCs provide far finer resolution than required. So, 10-bit resolution is the appropriate minimum to meet the 0.1°C accuracy over 100°C. Real-world accuracy also depends on reference stability and sensor linearity, but the minimum resolution logic points to 10-bit.

Resolution determines how finely an ADC can distinguish input changes. To measure temperature with 0.1°C precision over a 100°C span, you need about 1000 distinct steps (100°C / 0.1°C). An N-bit ADC provides 2^N possible codes. The smallest N that yields at least 1000 steps is 10, since 2^10 = 1024, which gives a step of roughly 0.0977°C over 100°C. An 8-bit ADC offers only 256 levels (too coarse), while 16-bit or 32-bit ADCs provide far finer resolution than required. So, 10-bit resolution is the appropriate minimum to meet the 0.1°C accuracy over 100°C. Real-world accuracy also depends on reference stability and sensor linearity, but the minimum resolution logic points to 10-bit.

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