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ADIN3310 VDDIO_B

Thread Summary

The user inquired about the VDDIO_B voltage for the 3-port ADIN3310 version when all ports are running at 1 Gbps RGMII. The final answer confirms that the 3.3V limitation for VDDIO_B does not apply to the 3-port version, and using a lower voltage (1.8V or 2.5V) is preferable to save power.
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Category: Datasheet/Specs
Product Number: ADIN3310

Hello, 
I'm designing a product using the ADIN3310 together with ADIN1300 for two gigabit Base-T ports and one gigabit host port.
In the datasheet under the section Power consumption and thermal considerations it says " When operating at 1 Gbps on all six ports, use VDDIO_B at 1.8 V or 2.5 V. Operating at VDDIO_B = 3.3 V when all ports are at a 1 Gbps speed is not supported".
Does this "Operating at VDDIO_B = 3.3 V when all ports are at a 1 Gbps speed is not supported" also apply to the three port version of the chip or can i use 3.3V for VDIO_B when both VDDIO_B ports and the VDDIO_A port are running 1Gbps RGMII?

Best Regards

  • Hello Maximilian,

    Thanks for your question. 

    Confirming this limitation does not apply to the 3-port ADIN3310 version. From a power dissipation point of view, it is preferrable to use a lower voltage VDDIO rail, saves power in the switch ports and also in external PHYs. 

    Hope this helps, let us know if further questions. 

    Best regards,

    Catherine,