| ??? 10/08/04 07:37 Read: times |
#78992 - Serial transmission + output filter Responding to: ???'s previous message |
I pick up the first 5 even number of data and if these all are 0000XXXX, then this even part is high byte and the next one should be low byte XXXXXXXX. I don't think that this will work without producing lots of errors. What I have to do is to make a confirmation that now receiving data is High or Low. Why don't you choose another mode of standard serial interface, a mode, where you can transmit a 9th bit, which tells you whether a 'high' byte or a 'low' byte is transmitted? 'Mode3' should do the job. DAC0 pin outputs quite a different shape of wave. Any problems? Well, I don't think that your scheme works, maybe I have misunderstood something. Nevertheless you NEED a filter at output which removes the quantization noise, a so called 'restauration filter'. This can be a four pole Butterworthfilter with a corner frequency tuned at half (or better third) the actualisation rate. This filter should allow you to suppress any frequency higher than half the actualisation rate. For very low noise and very low distortion you would need a high pole restauration filter. Of course, also digital filters can be used... Kai |
| Topic | Author | Date |
| DAC doesn't work well. | 01/01/70 00:00 | |
| RE: DAC doesn't work well. | 01/01/70 00:00 | |
| RE: DAC doesnt work well. | 01/01/70 00:00 | |
| RE: DAC doesn't work well. | 01/01/70 00:00 | |
| RE: DAC doesn\'t work well. | 01/01/70 00:00 | |
| Serial transmission + output filter | 01/01/70 00:00 | |
| RE: DAC doesn\\\'t work well. | 01/01/70 00:00 | |
RE: DAC doesn\\\\\\\'t work well. | 01/01/70 00:00 |