Now most of the ADC simulates and digitically, it is originally connected to this chip, and there is no need to use magnetic beads at all. For no internal connection, if the total area of the circuit is not large, the position of the analog circuit is concentrated, and there is no need to use the magnetic bead. The so-called ground line is a reference point, as long as the analog circuit is not large, use the overall flooring method, the potential difference between the ground pin of each simulation device is small, and there is no need to separate. However, if the analog circuit has a large area, it should be opened to the analog and digital. This is because the common impedance between the simulated digitial ground should be minimized. To put it bluntly, it is to let the simulation only for backflow analog current, digitally reflow digital current, because the ground wire is also from the resistance (impedance). If it is not separated, there may be a common impedance between simulation and digitally, if the analog voltage from a point is built into the branch containing the common impedance, this voltage will enter the digital current in Variation changes to generate interference to analog signals. The most important thing in the hybrid circuit is
Do not produce a common impedance of the modeland!
