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LMH1219: Question about the power supply of LMH1219

Go
Genius 4220 points
Part Number: LMH1219


Hi,

I'd like to know which power supply of LMH1219 (Vin / VDD_LDO / VDDIO / VDD_CDR) is used for these two  blocks below.

1. 100Ω differential output

2. 75 Ω Single end  input.

If someone have the document which shows the  supply destination of each  power supply of LMH1219,

It'll be the great help.

Thanks

Go 

  • 0
    TI__Mastermind 29655 points
    Hi Go,

    The 1.8-V supply on VDD_LDO is used for the 75-ohm IN0 input and the 100-ohm differential output blocks you mentioned. This 1.8-V can either be supplied directly at the VDD_LDO pin when operating in dual supply mode (VIN = 1.8-V), or it can be provided internally by operating in single supply mode (VIN = 2.5-V) by only tying decoupling caps to GND from the VDD_LDO pin.

    The blocks powered by the other power supplies can be implied from the naming convention:

    - VDDIO is used for the various IO pin logic in the LMH1219
    - VDD_CDR is used for powering the CDR block and 100-ohm IN1 CTLE in the LMH1219

    Thanks,

    Michael