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:
12, 15, 13, 12, 10, 12, 12, 14, 14, 13, 15, 19, 16, 14, 20, 19
A binary search was performed on the fi rst transition between codes -8 and -7 and found the code edge to be at 75 mV. A second binary search was performed and found the code edge between codes 6 and 7 to be 4.56 V. What is the average LSB size for this 4-bit ADC?