Tool/software:
Hello,
I'm reading a preceding thread
[OPA134: About pcn]
e2e.ti.com/.../opa134-about-pcn
We would ask some more explanation to understand the removal of the Trim feature.
- Is it harmful if the existing circuit board has external trim circuits connected to pin1 and 8 ?
And it could be a rare case, but if we can't let the pins opened ?
- Are the pins 1 and 8 true NC ? Or actually have wires to the die ?
- In the case is there any careabouts like power sequences or Abs Max ratings ?
The datasheeet requires "Don't connect" to Pin1, "Float" to Pin8.
We would like to have a better understanding to the following lines in the datasheet.
We can find the line in the Revision history, in teh epage-21 of the datasheet Rev.B:
"Changed OPA134 pin 1 and 8 from "Offset Trim" to "NC".............3"
We can also find a footnote "(1) Existing layouts for the OPA134 before revision B of this data sheet do not need to be redesigned."
in the datasheet, page-3.
