AD2428 A2B Bus I/O Filtering

Hi Alex,

Apologies for the slow response.

You are absolutely right. The current A2B filter network is optimized for automotive applications, tuned well to work with unshielded twisted pair cables of long length running in the car.

For consumer applications, it is certainly possible to optimize the filter design (or even remove some too) and yet meet the target requirements. However, we’ve neither designed a dedicated filter network for such use case, nor validated it with some specific tests.

If you could share more details regarding your use case: number of A2B nodes, cable lengths, overall A2B network length, etc., we could look into recommending some filter changes, while minimising EMC risks.

The decision to remove/incorporate the various filter elements would be driven by the EMI/EMC requirements. Furthermore, it´s important to note that these requirements vary from use case to use case, and therefore, a “one size fits all” approach is not applicable. The circuitry that we propose by default, and that we expect customers to adhere to, is designed to meet the most stringent Automotive EMI/EMC requirements.

I hope this helps.

Best regards,

Maikel

Hi Alex,

Apologies for the slow response.

You are absolutely right. The current A2B filter network is optimized for automotive applications, tuned well to work with unshielded twisted pair cables of long length running in the car.

For consumer applications, it is certainly possible to optimize the filter design (or even remove some too) and yet meet the target requirements. However, we’ve neither designed a dedicated filter network for such use case, nor validated it with some specific tests.

If you could share more details regarding your use case: number of A2B nodes, cable lengths, overall A2B network length, etc., we could look into recommending some filter changes, while minimising EMC risks.

The decision to remove/incorporate the various filter elements would be driven by the EMI/EMC requirements. Furthermore, it´s important to note that these requirements vary from use case to use case, and therefore, a “one size fits all” approach is not applicable. The circuitry that we propose by default, and that we expect customers to adhere to, is designed to meet the most stringent Automotive EMI/EMC requirements.

I hope this helps.

Best regards,

Maikel

Hello,

Thank you for your response and sorry for my late response. 

The current use case is going to be for a home audio system. At spec there would be 3-4 A2B nodes that could be utilized in a surround sound manner. There would be up to 4 amplifier slave peripherals connected at each A2B slave node. I wouldn't think that the distance between nodes would be much more than 30 feet.

The reason I ask about removing the EMI filtering is because a home environment is likely to be far less noisy than a car environment, so I am not sure if much EMI filtering would be necessary, and if some is necessary I would think a more basic filter would suffice.

Thank you,

Alex

Hi Alex,

Thanks for the additional details. We will contact you privately via email to share possible EMI/EMC filter optimization recommendations to better match your system requirements. 

Best regards,

Maikel