| ??? 04/12/06 20:55 Read: times |
#114188 - Re: what about the old "standard" Responding to: ???'s previous message |
Generally, for Analog Devices ADCs, their datasheets or supporting app-notes, ask you to consider the ADC as an Analog part. So the entire ADC chip is placed in the Analog section of your circuit. This chip is connected only to the Analog ground plane. To communicate with the micro controller(Digital section) you usually use an i-coupler such as ADUM series from Analog devices. This i-coupler is placed as a bridge between the Analog and Digital sections of the circuit. In a previous thread Kai has mentioned some problems with using an i-coupler at higher frequencies, which can be overcome by using 6N137 and careful layout design.
http://www.8052.com/forum/read.phtml?id=80468 And ofcourse, a four layer board is a must. Being fresh out of college, I have had considerable confusion in all these issues. In some instances, the Application engineers asked me to try all the different schemes of grounding / splitting etc. and choose the one with the least noise and best performance! -Ashish |
| Topic | Author | Date |
| analog ground of ADC | 01/01/70 00:00 | |
| Re: analog ground of ADC | 01/01/70 00:00 | |
| Its all black magic! | 01/01/70 00:00 | |
| Adding to the confusion | 01/01/70 00:00 | |
| Think about it.... | 01/01/70 00:00 | |
| Article isn't very helpful... | 01/01/70 00:00 | |
| In a nutshell | 01/01/70 00:00 | |
| what about the old "standard" | 01/01/70 00:00 | |
| Re: what about the old "standard" | 01/01/70 00:00 | |
| often the only viable method | 01/01/70 00:00 | |
| Looks great, but... | 01/01/70 00:00 | |
| in a perfect world | 01/01/70 00:00 | |
| what about ... | 01/01/70 00:00 | |
| Re what about... | 01/01/70 00:00 | |
what about ? | 01/01/70 00:00 | |
| Again, it's not helpful | 01/01/70 00:00 |