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DS15BA101: DS15BA101

Nir Mizrahi
Prodigy 10 points
Part Number: DS15BA101
Other Parts Discussed in Thread: DS15EA101

Hi,

I would like to connect two devices by SGMII, 1.25G with different voltage level as following:

TX side: device 1 transmit range is 225 - 525mvp-p to device 2 receive range 500 - 2400mvp-p

RX Side: device 2 transmit range 370 - 2200mv to device 1 receive range 100-600mvp-p

Please help me to choose the right part number.

If I need to calculate any resistor RVO, do you have a formula ? or maybe you can send me the Rvo I should use.

Since the values are typical, what is the +/- tolerance you can commit to ?

Thanks, Nir

  • 0
    TI__Guru* 93670 points

    Greetings,

    Output amplitude versus RVO is linear and it is indirectly proportional to the output amplitude. Maximum recommended output amplitude is 800mV(Rvo=487 ohm) and minimum 300mV(Rvo=1100mV). 

    Regards,Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 10 points

    TX Side: buffer input:  100-2200mv ptp (good) -> buffer output: 800mv ptp  - in this side I can use DS15BA101

    RX Side: buffer input:  100-2200mv ptp (good) -> buffer output: 800mv ptp  (too high but buffer output can be reduced by  control resistor Rvo.  “The output voltage level is controlled by the value of the RVO resistor connected between the RVO pin and VCC”) - in this side I can use DS15E101

    Please review and approve, as well as what is the value of RVO you recommend to use ?

  • 0 in reply to Nir Mizrahi
    TI__Guru* 93670 points

    Hi Nir,

    Apologize since i just noticed i got my units wrong.

    Your understanding is correct. Here is the equation: 

    Units: VOD in Volt & R in K-Ohm

    VOD = -0.815*R + 1.197

    Regards,Nasser

  • +1 in reply to Nasser Mohammadi
    Prodigy 10 points

    Hi Nasser,

    1. So in TX I need to use DS15BA101 and for RX DS15EA101, right? is it a different components and I need to order two different catalog numbers?

    2. The equation doesn't take into account the VCC(operating voltage of the device) - is it ok?

    Thanks, Nir

  • 0 in reply to Nir Mizrahi
    TI__Guru* 93670 points

    Hi Nir,

    Yes you are correct. You need to use BA101 for TX and EA101 for RX.

    Correct this does not take into account VCC. I don't expect much change though.

    Regards,Nasser