TLK2711-SP: REFERENCE CLOCK

Audrey Dupire

Prodigy 20 points

Part Number: TLK2711-SP

Hi,

I would like to know if the input GTX_CLK of TLK2711 shall be square wave or a sine ?

Does the specifiation of 40 ps jitter peak-peak includes that the the clock is square wave ?

Thanks

Audrey

over 3 years ago

0 Drew Miller1 over 3 years ago

TI__Mastermind 38633 points

Hi Audrey,

GTX_CLK is expected to be a square wave. I would expect that the jitter specification includes that the clock is a square wave.

Thanks,

Drew

0 Audrey Dupire over 3 years ago in reply to Drew Miller1

Prodigy 20 points

OK thanks, what is the input impedance of GTX_CLK ?

0 Drew Miller1 over 3 years ago in reply to Audrey Dupire

TI__Mastermind 38633 points

Hi Audrey,

The input impedance is pretty high. This is detailed by the input high and input low currents.

Thanks,
Drew

0 Audrey Dupire over 3 years ago in reply to Drew Miller1

Prodigy 20 points

Ok thanks, does the TLK work if the clock is a sine wave with a 50 ohm output ?

0 Drew Miller1 over 3 years ago in reply to Audrey Dupire

TI__Mastermind 38633 points

Hi Audrey,

We have not characterized device behavior with a sinusoidal clock, so I'm not sure how the device would behave. I would not expect the 50 Ohm output to cause an issue, but please note that your amplitude may be twice what you set it to due to high impedance input. You will also need to ensure that the DC offset is appropriate.

Thanks,
Drew

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TLK2711-SP: REFERENCE CLOCK