ADN4695 Differential Output Voltage Magnitude

Question

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

ConalW · Accepted Answer

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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ADN4695 Differential Output Voltage Magnitude