[time-nuts] Single ended or differential input to TDC chip

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Mar 27 16:58:15 EDT 2017

In message <20170327180513.307125ed395c80e4e6490781 at kinali.ch>, Attila Kinali w

>Now, the TDC expects a differential input, but the system gets single-ended
>pulses as input (50R coax input, level likely to be CMOS 3.3V, but level not
>fixed yet, ie can be freely choosen). I can either convert these single-ended
>signals into differential off-chip or on-chip. Unfortunately, I lack knowledge
>and experience to judge either approach. The issues I see are:

I would give the chip differential inputs, because that way it can
also be used, without loss of performance, on future differential

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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Never attribute to malice what can adequately be explained by incompetence.

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