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LMH1297: OUT0 Mute

K.Yaita
Guru 29720 points
Part Number: LMH1297

Hi Team,

There is two way to set OUT0 Mute as the following.

1) CTLE/CDR Register 0x1E[7:5]=111
2) ConfigIO Register 0x30[7:6]=11

What is the difference between these?
My customer confirmed 1) is less power consumption than 2) when mute OUT0.

Best Regards,
Yaita

  • 0
    TI__Guru* 93670 points

    Hi Yaita-San,

    In case of of #1 that you have noted, there is a m,ux that selects between different signals(for example raw mode, recovered clock). In 2nd case, the logic that mutes is before the mux for case #1.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Guru 29720 points

    Hi Nasser-san,

    Thank you for your reply.
    Regarding your information, it seems #2 is less power consumption than #1 however it is actually opposite.
    Do you know why #2 consume more power than #1? 

    1) CTLE/CDR Register 0x1E[7:5]=111: 122mA -> 119mA(mute)
    2) ConfigIO Register 0x30[7:6]=11: 122mA -> 122mA(mute)

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Guru* 93670 points

    Hi Yaita-San,

    In 2nd case, the logic that mutes OUT0 is BEFORE the mux that is controlled reg 0x1E. Therefor there is more buffering before the mux and therefor there is more current comsumption(~3mA).

    Regards,, Nasser