| ??? 12/21/09 02:09 Read: times |
#171807 - Clarification Responding to: ???'s previous message |
Yes, I'm sorry, I meant the Average of the repetitive peaks. I'm currently a student at university teaching myself microcontrollers.
I will have a DC offset of 2.5 V in my signal. the peak of the signal will never exceed 5 volts. Basically the chip samples at a max of 105.3 Hz based off the max sampling rate of the sinc^3 filter. I'm trying to sample over a long period of time as to be able to calculate the peak to peak voltage from my averaged 20 samples using this low sampling rate. For some reason It always outputs the DC offset. On page 31 of the datasheet I noticed that the primary ADC averages before it outputs the data. Will this always output the DC shift? I'm just not sure if the problem is due to the chip taking the average, or if it should be able to handle this. Datasheet: http://www.analog.com/static/im...DUC816.pdf Thanks a lot for the quick responses! |
| Topic | Author | Date |
| ADuC816 Problem | 01/01/70 00:00 | |
| Sample rate ? | 01/01/70 00:00 | |
| Isn't that exactly what you should get? | 01/01/70 00:00 | |
| Indeed! | 01/01/70 00:00 | |
| Hmm | 01/01/70 00:00 | |
| average of the repetitive peak ? | 01/01/70 00:00 | |
| Better | 01/01/70 00:00 | |
| Clarification | 01/01/70 00:00 | |
| Signal Frequency | 01/01/70 00:00 | |
| magnitude | 01/01/70 00:00 | |
| Dump a number of samples to check | 01/01/70 00:00 | |
| it is possible? | 01/01/70 00:00 | |
| fast sample-and-hold | 01/01/70 00:00 | |
| sorry, but | 01/01/70 00:00 | |
| and | 01/01/70 00:00 | |
| it won't | 01/01/70 00:00 | |
| Undersampling often quite powerful | 01/01/70 00:00 | |
| what is conclusion for OP? | 01/01/70 00:00 | |
| How about precision rectification? | 01/01/70 00:00 | |
| re:ADUC816 | 01/01/70 00:00 | |
| sure, you can | 01/01/70 00:00 | |
| Most cheaper digital scopes uses repetitive sampling | 01/01/70 00:00 | |
| how about | 01/01/70 00:00 | |
| SF=1 | 01/01/70 00:00 | |
| Consistent not a simple subset of accurate | 01/01/70 00:00 | |
| Dumping Values | 01/01/70 00:00 | |
| *EDIT* | 01/01/70 00:00 | |
Circuit | 01/01/70 00:00 |