LMK00304: Input Impedance

Ryan.Bishop

Expert 3900 points

Part Number: LMK00304

Hello,

What is the input impedance (to ground) for the CLKinX inputs for the LMK00304?

Thank you,
Ryan B

over 7 years ago

0 Alan O over 7 years ago

TI__Mastermind 32575 points

There is a weak input biasing network on each CLKinX+ and CLKinX- inputs. On CLKinX+, the DC bias is ~1.1 V through pullup of ~500 kohm and pulldown of ~250 kohm. On CLKinX-, the DC bias is ~1.35 V through pullup of ~500 kohm and pulldown of ~350 kohm. These are nominal values. The input offset voltage provides a known differential input state (logic low) when the CLKinX+/- pins are left open.

Alan

0 Ryan.Bishop over 7 years ago in reply to Alan O

TI__Expert 3900 points

Thanks for the quick and thorough answer Alan!
-Ryan B

Clock & timing

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LMK00304: Input Impedance