LMX2572LP: Oscin Configuration

Peter heng

Part Number: LMX2572LP

hello,i found the reference circuit of the LMX2572LP from the EVM schematic. i plan to use cmos oscillator SXO32C3B481-100.000M(Suntsu) parts. therefore i would like to know do i need to have R35=51ohm connected before the oscillator as shown below.

Pls feel free to provide any other alternative Oscin type with better performance.

Thank you.

10 days ago

0 Peter heng 6 days ago

Prodigy 10 points

hello, is there anyone i can contact regarding this?

+1 Noel Fung 6 days ago in reply to Peter heng

TI__Guru** 122030 points

Hi There,

CMOS clock does not require 50Ω load.

EVM user's guide Table 7 has a reference schematic.

0 Peter heng 5 days ago in reply to Noel Fung

Prodigy 10 points

thank you for providing the confirmation. i believe the 50ohm is needed only when i have a clock source of 50ohm impedance. i guess usually the Oscin impedance will be high and hence a shunt connected R25=51 is needed to lower the impedance.

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LMX2572LP: Oscin Configuration