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Inquiry regarding ADM2567E/ADM2867E Repeater Evaluation Board availability

Hello, all

Now we have one inquiry regarding ADM2567E/ADM2867E Repeater Evaluation Board availability from our customer.

Please refer to the items below, and feedback us with your comment. 

They are trying to evaluate emissions of ADM2567E/ADM2867E by evaluation board.

There has already released EVAL-ADM2587EEB2Z as Repeater Evaluation Board and this will suite for them to evaluate ADM2587E

However, it seems that this type of evaluation board has not released for ADM2567E/ADM2867E.

Please let us clarify whether you have any plan to release this or not.

We thank you in advance for your information.

Best regards,

Atsushi Okui

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  • Unfortunately there is no pin compatible ADM2561E/ADM2861E device which can drop in to replace the ADM2587E on the EVAL-ADM2587EEB2Z board. It will be difficult to replace the ADM2587E device with a ADM2561E/ADM2861E device without making modifications to the PCB.

    If the customer wishes to modify the PCB layout to change the ADM2587E footprint to a footprint for the ADM2561E/ADM2861E, the design files shared above in the .zip archive can be modified. If the customer would like help with this I can advise on the edits needed to the schematic. 



  • Hello, thank you as usual for your continuous support. 

    It seems that the modification on EVAL-ADM2587EEB2Z board itself is difficult for them.

    In stead of that, we are looking for any method to have emission test on 2 pcs of EVAL-ADM2561E, which is already released on your web site.

    Please let us clarify whether you have any idea to use 2 pcs of EVAL-ADM2561E for their emission test, in order to have further proceed.

    We thank you once again for your information. 

    Best regards,

    Atsushi Okui

  • Hi Okui-san,

    The emissions results for 2 pcs of EVAL-ADM2561EEBZ is expected to be very similar to the results for a single board. The reason for this is the interaction of the quasi-peak detector, used in the EN 55032 / CISPR 32 standards, and the spread-spectrum technique used in ADM2561E device. Because multiple dc-dc converters are not ran synchronously, the quasi-peak detector level should not increase significantly when measuring two devices vs one device. 

    Are their particular insulation requirements for your customer's system? The original EVAL-ADM2587EEB2Z was designed with two "back to back" ADM2587E devices for safety applications which required "double insulation" against mains voltages. The ADM2587E device features 2.5kV rms isolation, and < 8mm of creepage/clearance, and so is not rated for reinforced applications. In the EVAL-ADM2587EEB2Z board, one device acts as "basic insulation", with the second device acting as "supplementary insulation", the two isolated device combine to provide a "double insulation" system. 

    The ADM2861E features 5.7kV rms, 8mm creepage and clearance, so a single device is sufficient for use for "reinforced insulation", which is equivalent to "double insulation". If the customers requirements are for reinforced insulation to mains, only one isolated ADM2861E may be required. In this case, the 1st ADM2587E device could be replaced with a ADM2861E, and the 2nd ADM2587E device could be replaced with a non-isolated RS-485 transceiver.

    Something like the ADM3061E would be suitable for the non-isolated RS-485 transceiver. With only one isolated device, the emissions data can be taken directly front the plots in the ADM2861E datasheet.