ADN4695 Differential Output Voltage Magnitude

Hello

Our customer will use ADN4695 and evaluates this.

Then , the measured  differential output voltage of driver is about 1.6Vpeak to peak (Y-Z) at 50ohm load (  using two  100 ohm termination).

The customer asks us if  value of 1.6Vpeak to peak is abnormal value 

because  datasheet table2 specification says that |VOD| is 480mV~ 650mV.

Does   |VOD|   mean  absolute valute of Y-Z voltage ?

Datasheet P10 figure 16 Figure 16 ” ADN4690E Driver Output Eye Pattern”  describes  that |A-B| is ~1.2V and this value is not 480mV~650mV.

Please let me know your advice what |VOD|  means and 

please let me know your adviceif the differential output voltage of 1.6Vpeak to peak. is abnormal.

Regards,

Terumasa

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  • 0
    •  Analog Employees 
    on May 22, 2018 2:43 PM

    Hi Terumasa-san,

    Yes, |Vod| means the absolute value of Y-Z. So 650mV means either +650 mV, or -650 mV for the extreme of Y-Z (i.e. the peak-to-peak will be 1.3V). The typical performance characteristic, Figure 16 in the datasheet that you mention, has |Vod| of ~530 mV, or 1.06V peak to peak output swing.

    1.6 V peak to peak seems high. Could you post an oscilloscope plot of the output waveform, and a schematic or photo of the board being used for the testing? Alternatively please send a PM if the customer doesn't wish to post the information on here.

    It seems like the output load would need to be somehow not as much a load as 50 Ohm, or else the measurement is including ringing or something to cause the larger voltage to be measured.

    Regards,

    Conal

Reply
  • 0
    •  Analog Employees 
    on May 22, 2018 2:43 PM

    Hi Terumasa-san,

    Yes, |Vod| means the absolute value of Y-Z. So 650mV means either +650 mV, or -650 mV for the extreme of Y-Z (i.e. the peak-to-peak will be 1.3V). The typical performance characteristic, Figure 16 in the datasheet that you mention, has |Vod| of ~530 mV, or 1.06V peak to peak output swing.

    1.6 V peak to peak seems high. Could you post an oscilloscope plot of the output waveform, and a schematic or photo of the board being used for the testing? Alternatively please send a PM if the customer doesn't wish to post the information on here.

    It seems like the output load would need to be somehow not as much a load as 50 Ohm, or else the measurement is including ringing or something to cause the larger voltage to be measured.

    Regards,

    Conal

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