LMK00334-Q1: reference schematic question

user4979899

Expert 3080 points

Part Number: LMK00334-Q1
Other Parts Discussed in Thread: LMK00338EVM

Hi Sir,

May I know the purpose for REFOUT and REFOUT_EN ?

Can floating or reserve to test point ?

over 4 years ago

0 Lane Boyd over 4 years ago

TI__Genius 16845 points

REFout is an LVCMOS copy of the selected input clock. REFout_EN is used to enable REFout.

If you do not need REFout, leave REFout floating and pull REFout_EN to GND.

Kind regards,
Lane

0 user4979899 over 4 years ago in reply to Lane Boyd

TI__Expert 3080 points

Hi Lane,

Another question, we need to calculate value for external caps base on chip CL value.

Could you please help provide LMK00334-Q1 Crystal CL(load capacitance) value?

Thanks

0 user4979899 over 4 years ago in reply to user4979899

TI__Expert 3080 points

Hi Lane,

Is there any feedback?

0 user4979899 over 4 years ago in reply to user4979899

TI__Expert 3080 points

Hi Lane,

Need your help on it. Thanks

0 Lane Boyd over 4 years ago in reply to user4979899

TI__Genius 16845 points

Hi Anne,

Sorry for the delay. The datasheet suggests 18-20pF XTAL load capacitance. I tested the default LMK00338EVM (where the XTAL circuit image was found), and it functions without issue.

Kind regards,
Lane

Clock & timing

Clock & timing forum

LMK00334-Q1: reference schematic question