A linear histogram test was performed on a two's complementary 4-bit ADC, resulting in the following distribution of code hits beginning with code -8:
20, 15, 14, 12, 11, 12, 12, 14, 14, 13, 15, 16, 16, 14, 20, 23
Determine the endpoint DNL and INL curves for this ADC. Compare these results to those obtained with a best-fi t reference line