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Original question:

AMC1302EVM: Confused about recommended EVM layout, where to short GND1 and how to mitigate noise

AMC1302EVM: Shorting GND1 to AINN follow up

Aleks Stajic
Prodigy 30 points
Part Number: AMC1302EVM
Other Parts Discussed in Thread: AMC1302

Had a question related to shorting GND1 to AINN to solve the common mode issue. I was just wondering by how much the AINP voltage can dip below the GND1 reference once the GND1 is shorted to AINN. Also, would there be any benefits to shorting AINP instead of AINN, as the datasheet seems to suggest both would be acceptable. 

  • +1
    TI__Guru**** 168445 points

    Hi Aleks,

    Take a look at Table 6.1 on page 4.  The analog inputs of the AMC1302 can withstand voltage on the inputs to -6V below GND1 (current limited to 10mA).  As far as shorting AINp or AINn, either is fine, you would just have to deal with the potential inversion on the backend.  FS+ on the input would look like FS- on the output when you short AINp to GND1.