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ADN4654 output

Hi ADI Teams

  Can you check  the Voc( VOH/ VOL) range when there is no input signal( DINx no connected) . We test the Voc is about 2.2V using multimeter when VDDx power on. The figure 18 /19 in data sheet  is lower than 2.2V. 

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  • Hi Aggil,

    Figure 18/19 are captured with 100 Ohm across the outputs. The LVDS differential will be wider without this, hence higher Voh for your circuit.

    Also ADN4654 does not include failsafe for undriven inputs - so the output will be indeterminate anyway (can vary). Even tying + to VDD1 and - to GND1 will suffice to set the input to a definite state (output will have corresponding state of Doutx+ high and Doutx- low). If you then add 100 Ohm across the outputs you should see Voh/Vol similar to our TPC.

    Regards,

    Conal

  • Hi Conal

      thanks ,  How about ADN4624? 

  • Hi Aggil,

    ADN4624 will perform similarly if /Refresh1 and /Refresh2 are low. If /Refresh1&2 are high, then the output will still be steady state (not chattering) when the corresponding inputs are not left open, but at power-up without "refresh" it's not guaranteed ADN4624 outputs will be updated to match the input state (the output could be the opposite state as it is normally updated by either "refresh" or input transitions).

    Regards,

    Conal

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  • Hi Aggil,

    ADN4624 will perform similarly if /Refresh1 and /Refresh2 are low. If /Refresh1&2 are high, then the output will still be steady state (not chattering) when the corresponding inputs are not left open, but at power-up without "refresh" it's not guaranteed ADN4624 outputs will be updated to match the input state (the output could be the opposite state as it is normally updated by either "refresh" or input transitions).

    Regards,

    Conal

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