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TS3DDR3812: Differential Signals and single ended signals with TS3DDR3812

david sabalesky0
Intellectual 275 points
Part Number: TS3DDR3812

Dear experts,

I need a switch SPDT that can pass both differential and single ended signals.

I am muxing RGMII signals with 1000b Ethernet signals for use with a two different SOM's, system on module.

I have 12 signals that need to be muxed, hence this part is ideal if it can handle both single ended and differential signals.

While it is impossible to maintain differential impedance due to the signal paths, I believe that this part maybe able to handle switching.

Can the TS3DDR3812 switch pass through both single ended and differential signals?

Is the TS3DDR3812 an analog switch?

Your support is greatly appreciated.

David

  • 0
    TI__Genius 9132 points

    Hi David,

    For RGMII, the signal data rate for 1000Mbps is in the range of 125MHz, so the TS3DDR3812 will be able to handle the data rate with no issue given its high bandwidth of 1.675 GHz

    The TS3DDR3812 switch can pass through both single ended and differential signals and can be used for both analog and digital switching applications (as long as you stay within the recommended operation conditions of the device).

    Regards,

    Saminah

  • 0
    TI__Expert 4110 points

    Hi David,

    What voltage level will your signals be operating on? We recommend the VI/O of the TS3DDR3812 to be between 0V and VCC. 

    Would the 12 signals include the differential pairs? 

    Best regards,

    Ambroise

  • 0 in reply to Ambroise Suter
    Intellectual 275 points

    Hi Ambroise,

    I am using two different IMX7 modules. One version has GPHY output and the other has MAC (RGMII).

    The signals from the SOM are routed to the A port of the TS3DDR3812. The pins signal function change from PHY to MAC dependent on the SOM used.

    The other ports B and C of the TS3DDR3812, are connected to 7 port KSZ9897R Ethernet Switch, where Port B is routed to the MAC (RGMII) and Port C to the GPHY of the switch.

    Hence we are able to use both SOM's in either configuration. GPHY to GPHY, or MAC(RGMII) to MAC(RGMII).

    We are attempting to utilize either the MAC of PHY from the SOM without having to have to independent PCB designs. When PHY SOM is used the MAC port is disabled and vice versa.

    The signals all within the specified VCC range (+3.3VDC) of the TS3DRR3812.

    Your response is greatly appreciated.

    Thanks,
    David

  • 0 in reply to Ambroise Suter
    Intellectual 275 points

    Good Morning Ambroise,

    The 12 signals include 4 pairs of differential signals for the GPHY case and RX[3:0],TX[3:0],RXCLK,TXCLK,RCTL, TCTL in the MAC case.

    These signals are run at 125MHz with max edge rate, tr and tf, 0.75ns.

    If there are any issues please respond promptly back as I am in final design and layout stages.

    Your expertise is greatly appreciated.

    Sincerely,

    David

  • 0 in reply to david sabalesky0
    TI__Expert 4110 points

    Hi David,

    make sure to check the times in the switching characteristics table (page 5 & 7).

    Otherwise I you should be good to go

    Best regards,

    Ambroise