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DP83867IR: How to improve distortion?

Part Number: DP83867IR

Hello,

Our customer is proceeding "compliance test" internally at their lab.

One of finding is the distortion of Channel D is just around 10mV test limit.

Could you advise us how can we improve the distortion by register value setting?  

 

Another question is that on page15 of snla239c, there is description as below.

              Reg 0x25 = 0x400 //Single channel selection. It is important to change to appropriate channel under test

              //400: Channel A

              //420: Channel B

              //440: Channel C

              //460: Channel D

Is that meaning at the "compliance test", we should not need to perform distortion requirement at all channel active condition?

Can we can pass "compliance test" with just one by one channel activation?

Regards,

Mochizuki