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AFE5808 output are different between CH1-4 and CH5-8 in toggle/ramp mode

zhang hualiang
Prodigy 20 points
Other Parts Discussed in Thread: AFE5808, AFE5808A

Occasionally, I found AFE5808 output are different  between CH1-4 and CH5-8 in toggle/ramp mode, for example:

In toggle test mode:  CH1-4 output are:  -1  0 -1  0 -1  0 -1   0................

but                            CH5-8 output are:    0 -1  0 -1  0 -1  0  -1................

Is  this a normal phenomenon? If so,why?

Ths!

 

 

  • 0
    TI__Expert 6320 points

    From Xiaochen Xu:

    Please see reg 10[8], SYNC_Pattern in the 5808A datasheet pg. 31

    SYNC_PATTERN: Address: 10[8]

    By enabling this bit, all channels' test pattern outputs are synchronized. When 10[8] is set as 1, the ramp

    patterns of all 8 channels start simultaneously.

     

    Because we do NOT recommend AFE5808 for new designs, we only added this to AFE5808A and 5809.