| ??? 11/07/04 03:12 Read: times |
#80569 - RE: How good is this scheme? Responding to: ???'s previous message |
Prahlad said:
In your schematic shown you are using a common +5V supply for the whole circuit I mean Analog as well as digital both the sections and as you confirmer the connector finds place close to the star ground. You are using a MCP3201 12 bit SPI ADC with a single common supply for Analog and Digital sections. This schematic was posted by me in the following thread: http://www.8052.com/forum/read.phtml?id=68096 It was a reply to mister Mak Ini. He wanted to know, how to manage things with this 12bit converter... I want to know for what precision it becomes absolutly necessary to use two separate supplies? This cannot be clearly answered. Theoretically you can filter any supply to the 'needed' cleanliness. So, theoretically there is no need for separate supplies. But it's helpful of course to have them, because then you need not to take so much efforts for filtering. Really interesting is, what you do with the grounds! Anyhow you provide the supply voltages, proper star point grounding must never be violated!! Kai |
