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DS100BR210: Field of "Output Mode" at 0x10 address

masahiko shimizu
Guru 11235 points
Part Number: DS100BR210

Hi,

I want to know the difference of operation by setting Output Mode.
If we select "0" = 10G-KR operation, How waveform the device output?
and If we select "1" = normal operation, How waveform the device output?

Best regards,
Shimizu

  • 0
    TI__Mastermind 43795 points

    Hi,

    Setting "0" = 10G-KR produces a more linear drive characteristic.  The low frequency voltage gain is reduced to ~ 1.3x.  This makes the output amplitude dependent on the input amplitude.

    Setting "1" = normal operation produces a limiting drive characteristic. There is significant voltage gain through the device in this mode.  The output amplitude is set using VOD/DEM controls.

    Note:  For this register bit in 0x10 to take effect, it is necessary to also program the following registers.

    Write 0x06 = 18'h

    Write 0x08 = 04'h

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 11235 points

    Hi Lee,

    Thank you for your previous reply.
    I have a question about your answer.

    "The low frequency voltage gain is reduced to ~ 1.3x." in your answer.
    I think "~ 1.3x" shows to increase.
    Could you let me know more detail about this mean, please?

    This device has De-emphasis function.
    I could understand the part of "The low frequency voltage gain is reduced".


    Best regards,
    Shimizu

  • 0 in reply to masahiko shimizu
    TI__Mastermind 43795 points

    Hi Shimizu,

    When the output is in normal mode and there is a 100mV input amplitude, the output level will be determined by the VOD setting. Example VOD setting = Level 5, output amplitude = 1V.

    When the output is in 10G-KR mode and there is a 100mV input amplitude, the output level is mostly determined by the input amplitude.  Example VOD  setting = Level 5, output amplitude will be ~ 100mV x 1.3 = 130mV.

    Enabling an output setting with De-emphasis will further reduce the low frequency output amplitude.

    Regards,

    Lee