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Faults in EVAL AD2S1210


I am using EVAL AD2S1210 Board with Arduino. 

I am able to write the registers and read angle from EVAL Board using Arduino. 

Even though Angles are reading correctly, Always board is showing LOT and DOS faults. I tried clearing fault register as well. But still this 2 faults are always in the board. 

Please suggest me a way to clear this faults.

Also want to know the use of resistors R22 and R21 which are in the paths of sin and cosine signals.