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TLC081A: Can NULL pins of TLC081A be left open when offset calibration is not needed?

Part Number: TLC081A


 Hello guys,

 One of my customers is considering using TLC081C for their new products.

 They have a few questions about the device. 

 Could you please give me your reply?

 Q1. Can NULL pins of TLC081A be left open when offset calibration is not needed?  

 Q2. I can see the condition, "Rnull=0ohm" in the graph, "phase margin vs load capacitance"

       as Figure 19 on page 12 in the device datasheet (Version No.SLOS254F). 

       What does "Rnull=0ohm" mean?

       Is it connecting between NULL pins? Or is it leaving each NULL open?

 Your reply would be much appreciated.

 Best regards,

 Kazuya.