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DS100DF410: DS100DF410: Minimum input differential voltage

Part Number: DS100DF410
Other Parts Discussed in Thread: DS100RT410, DS110DF410

Hello,

the input parameters VTX0 - VTX2 are completely unclear.

There is a similar topic on this forum but no clear answer.

OK, if the input diff voltage should be >200 mV then why this is not directly specified in the datasheet?

And why VTX0 is higher than VTX2 (1600 mV > 1000 mV)? Yes, it is clear, shorter input channel gives us more voltage using the same transmitter at the far end.

But the datasheet does not specify the transmitter and even the line! How should i interpret this parameters?

The description is "Minimum source transmit launch signal level (IN, diff)".

Is this a minimal voltage needed for start any transmit activity of retimer?

Or what else it is?

  • Greetings,

    Typical launch amplitude into a 40-inch transmission line is 600mV. This transmission media attenuates high frequency content by 35-40dB - based on loss profile of the media. This means your signal can be as low as 6mV and device is able recover and lock to the signal.

    Additionally, please note signal detect assert level is 70mV.

    Regards,, Nasser

  • What is VTX0 = 1600mV?

  • VTX0 = 1600mV is the recommended max voltage output differential at the channel input for the case of a very high insertion loss channel.

  • But the note 7 is saying there is no input channel!

    There is an obvious bug in original sources (i believe your writers use something like DITA to build documents). Note 5 is about EEPROM but should be about voltages.

    In the datasheet for DS100RT410 this bug also exists.

    But in the datasheet for DS110DF410 all notes for VTX are numbered 6 to 8.

    Therefore i recognize two bugs:

    1. Notes are uncorrectly numbered in all datasheets.

    2. Note for VTX2 is missing in some datasheets.

    Please correct this for all datasheets simultaneously. This will greatly simplify comparing them. Devices are almost similar but datasheets are builded with significant differences in view (not in data). The ordering of pins in tables is the first example.

    Comparing of datasheets is very important to select correct device at development stage.

    Thank you.