The zero scale error is expressed in µV in the datasheet, and this spec should cover for all Softspan ranges. In order to convert to convert to LSBs this should be divided by the LSB size shown in Table 1.
Table 1
|
|
|
Ideal Range (VREFBUF = 4.096 V) |
|
||
|
SoftSpan |
Differential Input Range |
Negative Full Scale |
Zero Scale |
Positive Full Scale |
LSB (µV) |
|
|
Bipolar (Two’s Complement) |
|
|
|
|
|
15 |
±10x(VREFBUF/1.024) |
40 |
0 |
40 |
76.294 |
|
13 |
±6.25x(VREFBUF/1.024) |
-25 |
0 |
25 |
47.684 |
|
11 |
±5x(VREFBUF/1.024) |
-20 |
0 |
20 |
38.147 |
|
9 |
±3.125x(VREFBUF/1.024) |
-12.5 |
0 |
12.5 |
23.842 |
|
7 |
±2.5x(VREFBUF/1.024) |
-10 |
0 |
10 |
19.073 |
|
5 |
±1.5625x(VREFBUF/1.024) |
-6.25 |
0 |
6.25 |
11.921 |
|
3 |
±1.25x(VREFBUF/1.024) |
-5 |
0 |
5 |
9.537 |
|
1 |
±0.625x(VREFBUF/1.024) |
-2.5 |
0 |
2.5 |
4.768 |
|
|
Unipolar (Straight Binary) |
|
|
|
|
|
14 |
|
|
0 |
40 |
38.147 |
|
12 |
|
|
0 |
25 |
23.842 |
|
10 |
|
|
0 |
20 |
19.073 |
|
8 |
|
|
0 |
12.5 |
11.921 |
|
6 |
|
|
0 |
10 |
9.537 |
|
4 |
|
|
0 |
6.25 |
5.960 |
|
2 |
|
|
0 |
5 |
4.768 |
|
0 |
|
|
0 |
2.5 |
2.384 |