Hi ADI team,
There are four DNC pin for LT1461, and I found that the DC impedance is only 5ohm between pin7 and pin8. Another samples show around 0.83Kohm between pin7 and pin8, and the voltage works well for 3V output.
I put my all measurement below.
pin7 to pin8 is 0.83Kohm ==> 15pcs PCBA ==> 3V output is OK
pin7 to pin8 us 5ohm ==> 2pcs PCBA ==> not to power on yet.
I wonder if it is OK for both conditions for pin7 and pin8, and can you confirm what's going on for both measured impedance? Can I power on for these 2pcs PCBA? Any risk?
Please note that I leave DNC pin floating wihtout any connection.
This is actually normal. The DNC pins are used to trim the parts.
But regardless of that, please be reminded that the DNC pins should not be connected in any way. Doing measurement, probing or any other connection with the DNC pins might de-trim.