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DAC38RF89: NO OUTPUT! ASK for HELP.

Part Number: DAC38RF89

  Dear:

      I met a problem ,when I using the DAC38RF89.I choose the register of 0x12F_0001 ,get the constant output of a sine wave,but when I change the register to 0X12F_0000,there is nothing out. I got the 204b communication was wright through read the register 0x164-0x16d,which get the 0000. 

     My DAC38RF89 worked at the  LMFS=8118,I want to get some code or some advice ,include the use of the register 0x128.

    Thank you

    Best wish.

                                    XuanGuo