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TUSS4470: Transducer Driving Frequency couldn't able to get same frequency as the frequency i set in GUI.

Part Number: TUSS4470

i can get same output as what i set is 55.5khz and the same freq i receive from io1 and io2 but the only issue is the x+ and x- freq is completely different from what i seted is 55.5khz and output of x+ and x- is  159khz.

the set freq is 55.5khz: 

output from io1 and io2:

u can see the freq i got as same as i set 55.5khz

output x+ and x- : 

u can see the difference freq is 159khz

 

with thanks,

Anto jslin jijo