Compiler/TMS320F28035: 28035's pin of VSSA(PN PIN NO.21)

Hello,

1) It is best practice to use a separate analog ground. Generally, the analog and digital ground are connected to a single point. There are many resources online that elaborate on the best practices to do this. For an ADC it is important to try to prevent any digital noise from affecting the analog performance.

2) Yes, VSSA is the 'Analog Ground Pin', so this pin should connect to the analog ground.

Best,

Marlyn

xufeihx,

Something else to keep in mind is that even though we believe split planes provide better theoretical performance, a board with split planes that is poorly designed will often have worse performance than a board with a single, continuous ground plane that is shared between digital and analog signals.

Many of our C2000 EVMs use a single ground plane that is shared between digital and analog circuitry.  Noise is mitigated by maximizing the distance between analog and digital signals, and by minimizing the distance between the ground plane to every signal.

-Tommy