We are using ADS62P22 in one of the designs. Some chips are giving positive slope and some are giving negative slope for same inputs . Below is the behavior. Please help us to know the difference. ADC_INPUT Positive (ADC_INP) and ADC_INPUT Negative (ADC_INM) are same in both the cases.
Some chips are giving positive slope. Below is the data and graph:
|
DC Voltage |
HEX |
Dec |
ADC_INP |
ADC_INM |
|
0 |
723 |
1827 |
1.43 |
1.54 |
|
0.5 |
835 |
2101 |
1.5 |
1.47 |
|
1 |
955 |
2389 |
1.57 |
1.4 |
|
1.5 |
A6A |
2666 |
1.64 |
1.33 |
|
2 |
B97 |
2967 |
1.71 |
1.26 |
|
2.5 |
CB0 |
3248 |
1.78 |
1.19 |
|
3 |
DD0 |
3536 |
1.85 |
1.12 |
|
3.5 |
EED |
3821 |
1.92 |
1 |
|
3.9 |
FBC |
4028 |
1.97 |
1.01 |
Some chips are giving Negative slope. Below is the data and graph:
|
DC Voltage |
HEX |
Dec |
ADC_INP |
ADC_INM |
|
0 |
8CE |
2254 |
1.4375 |
1.54 |
|
0.5 |
7C3 |
1987 |
1.5065 |
1.4752 |
|
1 |
6B7 |
1719 |
1.5765 |
1.4052 |
|
1.5 |
59F |
1439 |
1.647 |
1.3352 |
|
2 |
48C |
1164 |
1.7173 |
1.265 |
|
2.5 |
37B |
891 |
1.7876 |
1.1951 |
|
3 |
26D |
621 |
1.8578 |
1.1253 |
|
3.5 |
160 |
352 |
1.9275 |
1.0559 |
|
4 |
52 |
82 |
1.9953 |
0.9884 |
