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Original question:

SN75DP159: Failing EMC testing

SN75DP159: EMI issue

Ben Kuo
Expert 7570 points
Part Number: SN75DP159

Tool/software:

Hi Team,

We faced to EMI issue of SN75dp159 and found an E2E post about EMI/EMC problem.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/712523/sn75dp159-failing-emc-testing/2679137?tisearch=e2e-sitesearch&keymatch=SN75DP159%2525252520EMI#2679137

We follow the comment but still face to some problem.

we write 91 in last two comments but readback value will be 90.

Could you let me know how to solve the comments issue?

or any suggestion to improve EMI/EMC?

We have reviewed CMC design and add ac coupling cap, but cannot have specific improvement.

Regards,

Ben