ADIN1101_MDI circuit design

Hi teli 

Thank you for reaching out to us.

The choice between capacitive coupling and galvanic isolation depends on the application requirements. If the device is intended for process control in explosive zones and qualifies as an APL (Advanced Physical layer) device, then capacitive coupling is more likely to be used. If the device is not an APL device, then either capacitive or galvanic isolation may be used depending on the application.

Regards,

Shazia

Hello Shazia

Thank you for your reply.

In what kind of applications is galvanic isolation used?

I think capacitors are more advantageous in terms of size and cost.

Is it correct to understand that galvanic isolation is used in applications that require a certain level of insulation withstand voltage from the outside?

Regards,

Teli

Hi teli 

Galvanic isolation is often a requirement for high voltage isolation, for instance, for safety reasons. It is also related to ground isolation and EMC performance. Unless there's a specific reason such as the need to isolate grounds or meet high voltage safety standards, capacitive isolation is usually sufficient.

Our devices pass EMC tests with capacitive isolation without the need of galvanic isolation. Refer to the ADIN1101 datasheet (Table 7) for more details.

Capacitive isolation isn't always the best cost/size choice. It provides better value in terms of size and cost in compact, low-voltage applications. However, if the application needs high voltage isolation, the capacitors must be rated accordingly, which can increase both cost and physical size compared to transformers.

Regards,

Shazia

Hi Shazia

Thank you for your answer.

Regards,

Teli