| ??? 03/31/06 14:35 Read: times |
#113488 - The culprit: Vref. Responding to: ???'s previous message |
Ok, the culprit has been identified: Apparently, the reference input current changes signficantly depending on whether the ADC is being calibrated or in continuous conversion mode. This caused Vref to drop to 2.41 V in continuous ADC conversion mode, which messes up the measurements.
Stabilizing Vref with a capacitor or buffering with an OpAmp should make things work correctly. |
| Topic | Author | Date |
| ADuC845 ADC oddity ? | 01/01/70 00:00 | |
| Limited input voltage range | 01/01/70 00:00 | |
| Yes, I think so. | 01/01/70 00:00 | |
| Small correction | 01/01/70 00:00 | |
The culprit: Vref. | 01/01/70 00:00 |