| Andy Peters 05/24/07 02:43 Read: 339 times Tucson, Az USA |
#139727 - grounds etc Responding to: Chinmay Nanda's previous message |
Chinmay Nanda said:
What i have in mind is that i would design two separate boards for digital and analog. digital section -which will only have the uc with related circuitry ,this section will be connceted to another board with DAC and ADC on them with the isolators via a FRC connector.
1> do i still need to join the GND 's of these two boards?wont it defeat the purpose of isolation You MUST join the grounds together. You can't have one board floating with respect to the other. 3> I will be grateful if someone could give me some ref. or link which clarifies the concept of isolation. Here's a thought. You're probably overly paranoid about "isolation." If you are careful with your layout, you can put your micro AND your converters all on the same board, with the same ground plane, and meet your desired performance specs. Note the comment, "careful with your layout." As Erik and Kai note, you MUST do a multilayer board. You'll want to provide separate power supplies for the analog and digital components. But you can use one ground plane for everything ... if you ensure that your digital traces never cross sensitive analog signals and if you basically have distinct digital and analog areas of the PCB. Good luck. -a |
| Topic | Author | Date |
| need for isolating signals | Chinmay Nanda | 05/18/07 14:36 |
| avoiding the inverter | Kalpak Dabir | 05/18/07 20:19 |
| sinking the current | Chinmay Nanda | 05/21/07 01:17 |
| Sinking and sourcing | Andy Neil | 05/21/07 01:23 |
| the bulb blinked !!! | Chinmay Nanda | 05/21/07 01:45 |
| Don't guess! | Andy Neil | 05/21/07 02:25 |
| trnasfer char. | Chinmay Nanda | 05/21/07 02:52 |
| Transfer characteristic | Andy Neil | 05/21/07 03:01 |
| More so | Russell Bull | 05/19/07 01:05 |
| I see two possibilities | Erik Malund | 05/19/07 07:53 |
| accuracy | Chinmay Nanda | 05/21/07 01:05 |
| 0.01% approx 14 bits | Erik Malund | 05/21/07 08:28 |
| Hardly... | Kai Klaas | 05/21/07 09:56 |
| No need... | Kai Klaas | 05/19/07 08:11 |
| need to place inverter | Chinmay Nanda | 05/21/07 01:13 |
| my design | Chinmay Nanda | 05/21/07 01:32 |
| FRC? | Andy Neil | 05/21/07 02:27 |
| FRC? | Michael Karas | 05/21/07 02:52 |
| or may be this...... | Chinmay Nanda | 05/21/07 02:57 |
| Not really | Andy Neil | 05/21/07 03:04 |
| Flat Ribbon Cable connector | K.ganeshan | 05/21/07 04:30 |
| FRC Connector! | Andy Neil | 05/21/07 03:09 |
| You don't know the Flat Ribbon Cable? | Kai Klaas | 05/21/07 09:40 |
| Not by that name! | Andy Neil | 05/21/07 09:54 |
| FAQ: How to post pictures? | Andy Neil | 05/21/07 02:29 |
| you are grasping for straws | Erik Malund | 05/23/07 06:15 |
| sure, but to what use | Erik Malund | 05/23/07 06:21 |
| grounds etc | Andy Peters | 05/24/07 02:43 |
| not entirely correct | Erik Malund | 05/24/07 06:32 |
| single plane | Andy Peters | 06/04/07 18:27 |
| A very well qualified layout person can do 'magic' | Erik Malund | 06/05/07 06:00 |
| but he can hardly outsmart the laws of physics | Kai Klaas | 06/06/07 12:06 |
| Nevertheless, there IS a difference | Kai Klaas | 06/06/07 12:02 |
| the difference | Andy Peters | 06/06/07 13:00 |
Yes, yes, yes, but... | Kai Klaas | 06/06/07 22:30 |
| Aside: Other Isolation Technologies | Andy Neil | 05/23/07 02:37 |
| no response | Henk Landwerd | 06/04/07 13:29 |