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11/18/08 14:01
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 		 #160111 - PCB routing question
I am a bit worried with third parties project with their pet choise of PIC16F877 MCU .They require ADC for sensor conditioning . When I had a look into the datasheet I couldnt locate the AGND and DGND pins ? it only has Vdd and Vss both common for Analog and Digital circuit . Now how usefull could be the split ground plane topology would be here here , I am feeling foolish to do this as the GND seems to be already connected inside . It wouldnt make sense to split the GNDs and connect the two with low impedance externally or will it make sense ?
I need advise for routing this for minimum noise addition to the ADC circuitry .

Regards/
AP


List of 33 messages in thread
TopicAuthorDate
PCB routing question            01/01/70 00:00      
   once conneced inside ...            01/01/70 00:00      
   Maybe these links can help...            01/01/70 00:00      
      Is this ok            01/01/70 00:00      
         This is no PIC forum!            01/01/70 00:00      
            Not so            01/01/70 00:00      
               being in chat and the question having merit ...            01/01/70 00:00      
                  So you give me benefit of doubt :-)            01/01/70 00:00      
                     if two things are both beneficial ...            01/01/70 00:00      
                     I also recommend a 4-layer Board            01/01/70 00:00      
                        10-bit            01/01/70 00:00      
                           The rolling filters...            01/01/70 00:00      
                              changed            01/01/70 00:00      
                                 Wrong!            01/01/70 00:00      
                                    Consider this alternate            01/01/70 00:00      
                                       Exactly, that's what I meant!            01/01/70 00:00      
                                          Microchip people seems careless            01/01/70 00:00      
                                             Yes            01/01/70 00:00      
                                                To be on the safe side..            01/01/70 00:00      
                                                   Please compare and see...            01/01/70 00:00      
                                             Argh...not another chip here...            01/01/70 00:00      
                                                Oscillator pins as noise source            01/01/70 00:00      
                                                   Yes, the promises sound good...            01/01/70 00:00      
                                                      Differential mode advice            01/01/70 00:00      
                                                         I cannot see a differential mode            01/01/70 00:00      
                                                            Jpg format            01/01/70 00:00      
                                                               jpeg not so good for computer-generated images            01/01/70 00:00      
                                                            One point missed            01/01/70 00:00      
                                                               The SMPS should be enough of a reason            01/01/70 00:00      
                                    Great!            01/01/70 00:00      
                                       you have already lost the battle ...            01/01/70 00:00      
                                          Containing the damage            01/01/70 00:00      
                                             "hope springs eternal" ...            01/01/70 00:00      

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