DS90UB913A/14A max distance and power over coax

Hello Tom,

The cable distance is dependent on cable specifications. If the cable is very low loss, automotive qualified, and has robust shielding than cable distance for coax could extend much longer than 15m. 15m is the max distance using our recommended automotive cable type - Leoni Dacar 462.

A lower voltage can be passed over the PoC network, however you have to be very careful of the current you are sending in addition to the voltage. Smaller PoC voltages will have a much larger current. On the 913A/914A EVM's, the max current supported isn't limited by the saturation current of the inductors; instead it is limited by the ferrite bead located on the board. Max current that can be supported on these EVM's is 400 mA (ferrite part #: BLM18AG102SN1D) and typically you don't want to test it all the way to the max. 2.7V PoC voltage will likely be cutting this close, and it will depend upon the resistive load on the 913A side of your customer system to see what current is being sent through the wire.

-Sean

Do you have a recommendation for a max 20-m coax cable for this application?

Regarding the voltage, the customer will stick with 12V @ 250mA max.

Tom

I'm sending you a document directly that should help with your question.

Mark Sauerwald