TPS25830-Q1: Interface - INTERNAL forum

Hi,Yuta-san,

If our customer use a Lo-Z clock source input the SYNC/RT,I suggest that Rterm should be low(50ohm),and the RT suggest that 45kohm~40kohm for the 450kHz~500kHz setup,because when the Lo-Z clock source turn off,we can also setup the frequency depending on the RT.You can ignore the Rterm,becasue it too smaller to affect the RT.

By the way,you can add a Ccoup (10pf) for bypassing the RT when using a Lo-Z clock source. Just like the below picture shows.

Thanks,

Kuno

Hi Yuta-san,

The reason is that when you use a Low-Z clock source,you have to choose  the RT in series with it,because when the Low-Z clock source doesn't work,its impedance is low,at this time,the series RT will work to setup the frequency.

Besides,when the Low-Z clock source is working,we don't want the RT works,so we need to add the Ccoup in parallel with RT to bypass it. 

Thanks,

Kuno.