Other Parts Discussed in Thread: ADS8353
Dear team,
My customer consider using ADS8354 at their application. but there is issue of ADC output. please review below status and let me know your opinion.
<Setting>
- For CFR.B9 = 1, FSR_ADC_A = ±2 × VREF_A and FSR_ADC_B = ±2 × VREF_B
- CFR register : "8240" (Hex) , use internal reference.
- AINP : 0 ~ 5V
I expected the result of ADC output to be 8000~7FFF. but I got a result like below. How can we get a result 8000~7FFF in response to 0~5V input?
If ADS8354 is not right device, please let me know reason of wrong selection and please recommend right solution.
AINP = Vdc, |
AVDD = 5.505V |
AVDD = 5.073V |
|||
REFDAC 1FF |
REFDAC 1AE |
REFDAC 1FF |
REFDAC 1AE |
||
|
Vin DC(V) |
ADC Code(HEX) |
ADC Code(HEX) |
ADC Code(HEX) |
ADC Code(HEX) |
1 |
0.0 |
0079 |
0062 |
008E |
0086 |
2 |
0.5 |
19A2 |
1A92 |
199C |
1ADE |
3 |
1.0 |
333E |
354E |
3382 |
35B4 |
4 |
1.5 |
4CDA |
4FCA |
4D30 |
5026 |
5 |
2.0 |
667A |
6A94 |
66B8 |
6AB6 |
6 |
2.5 |
801C |
8544 |
805A |
857C |
7 |
3.0 |
99B0 |
9FE6 |
99F8 |
A020 |
8 |
3.5 |
B356 |
BA7C |
B38A |
BAD8 |
9 |
4.0 |
CCE6 |
D53C |
CD54 |
D5B4 |
10 |
4.5 |
E68C |
EFF6 |
E68E |
F022 |
11 |
5.0 |
FFFE |
FFFE |
FFFE |
FFFE |
If you need more information and test, let me know.
Thank you.