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Why are mixed signal ICs need different grounding techniques?
To further complicate the issue, mixed-signal ICs have both analog and digital ports, adding to the confusion with respect to proper grounding techniques. In addition, some mixed-signal ICs have relatively low digital currents, while others have high digital currents. In many cases, these two types require different treatment for optimum grounding.
How is ground wiring used in DC converters?
Ground Wiring in DC/DC Converters | Your analog power IC and the best power management, TOREX. Everyone has to stop and think very carefully about the copper trace pattern and placement of components when designing a printed wiring board.
Is there a conflict between analog and digital ground?
There is, in fact, no conflict. The labels, “analog ground” and “digital ground,” on these pins refer to the internal parts of the converter to which the pins are connected and not to the system grounds to which they must go.
Where are the analog and digital ground pins on an ADC?
The labels, “analog ground” and “digital ground,” on these pins refer to the internal parts of the converter to which the pins are connected and not to the system grounds to which they must go. For an ADC, these two pins should generally be joined together and to the analog ground of the system.
What do you need to know about grounding techniques?
Proper conductor routing and sizing, as well as differential signal handling and ground isolation techniques, enable control of such parasitic voltages. An important topic to be discussed is grounding techniques appropriate for a mixed-signal, analog/digital environment.
Is there a conflict between analog and digital ground pins?
There is, in fact, no conflict. The labels, “analog ground” and “digital ground,” on these pins refer to the internal parts of the converter to which the pins are connected and not to the system grounds to which they must go. For an ADC, these two pins should generally be joined together and to the analog ground of the system.
Why is star grounding difficult to implement in practice?
The star grounding philosophy, while reasonable theoretically, is difficult to implement in practice. For example, if we design a star ground system, drawing out all signal paths to minimize signal interaction and the effects of high impedance signal or ground paths, implementation problems arise.