| Kai Klaas 01/11/10 09:04 Read: 197 times Germany |
#172345 - Thoughts... Responding to: Gopal Amlekar's previous message |
Does the supply voltage of ADC or any other pin show fluctuations, when ALE goes high?
What happens if you put a 100nF cap from ADC input to signal ground? Gopal said:
I am using the same hardware and same chip. Only the controller is changed. Controller sits on a separate board thand ADC. That might not be a good idea. If the signals from the micro show steep edges you could have ringing at the ADC side resulting in mad performance. Show us a schematic of your circuit. Kai Klaas |
| Topic | Author | Date |
| ADC0809 problem | Gopal Amlekar | 01/10/10 09:09 |
| Is the very same ADC chip in both cases? | Daniel Contarino | 01/10/10 09:51 |
| From time to time... | Kai Klaas | 01/10/10 14:22 |
| Datasheet read, same hardware | Gopal Amlekar | 01/11/10 02:53 |
| Define 1000000000% | Per Westermark | 01/11/10 06:48 |
| Thoughts... | Kai Klaas | 01/11/10 09:04 |
| Solved partially | Gopal Amlekar | 01/13/10 04:06 |
| So the cap did help? | Kai Klaas | 01/13/10 08:56 |
| RE: That cap did help? | Gopal Amlekar | 01/15/10 06:48 |
The input multiplexer is damaged!  | Kai Klaas | 01/15/10 08:49 |
| Discharge diode | Per Westermark | 01/15/10 10:14 |
| RE: The input multiplexer is damaged | Gopal Amlekar | 01/16/10 02:01 |
| Indeed, a very poor design!!! | Kai Klaas | 01/16/10 09:38 |
RE: Indeed, a very poor design!!! | Gopal Amlekar | 01/17/10 06:27 |