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AD9670 - Abnormal ADC reading

Question asked by shengwuei on Oct 6, 2016
Latest reply on Oct 17, 2016 by AshrafS

Hi all,

 

Following the old but haven't been solved problem(Any difference between the LVDS interface of AD9670 and AD9279 ?  ), more tests were done and still looking for suggestions.

 

( we have 8 AD9670 chips on board, so total 64 channels on the board )

 

  • this problem in normal mode : channel 25~32(the 4nd AD9670) abnormal

 

  • this problem when using analog test tone (bit[2:0] = 100 of address 0x11B)
    : channel 40~47(the 6nd AD9670) abnormal

 

  • this problem when using digital test tone (bit[2:0] = 001 of address 0x11B)
    : channel 40~47(the 6nd AD9670) abnormal

 

some observations :

  1. when this problem happens, ADC reading of all the 8 channels inside one AD9670 is abnormal
  2. this problem happens frequently in normal and test tone(analog or digital) mode, but rarely in test pattern mode(bit[3:0] of address 0x00D). Maybe there are more than one problem (?)

 

Looking forward to any suggestion, thanks !!!

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