| ??? 07/08/06 02:41 Read: times |
#119842 - Somewhat related question Responding to: ???'s previous message |
Russell Bull said:
Because the adc in the analog devices part is sigmadelta converter, it takes a few conversion cycles to aquire the new value when you change channels. Russell, regarding this issue, we're considering an ADuC843 in a project. We'd like to sample 8 audio channels (40kHz rate on each channel) constantly. The part is rated for 420ksps. I talked to a contact I have at Analog Devices and asked him about the impact of using DMA to read each of the 8 channels and whether there would be an impact due to the fact that each of the 8 DMA samples would be on different channels. He said the 420ksps throughput took into account the settling time in changing the channel. Does this contradict the information you have? I haven't looked at the '845 so I don't know how similar the part is. The '843 is a 12-bit 420ksps and we only need 40x8 = 320ksps. Thoughts? Regards, Craig Steiner |
| Topic | Author | Date |
| ADuC845: Changing ADC Channel slows down | 01/01/70 00:00 | |
| Delta sigma adcs | 01/01/70 00:00 | |
| Somewhat related question | 01/01/70 00:00 | |
| AD parts | 01/01/70 00:00 | |
| DMA can affect precision? | 01/01/70 00:00 | |
| Even _code_ can affect precision ... | 01/01/70 00:00 | |
Exactly! | 01/01/70 00:00 | |
| Gotcha | 01/01/70 00:00 | |
| The answer you seek ... | 01/01/70 00:00 | |
| Thanks! | 01/01/70 00:00 |