Adit,
First, the VSENSE pins are part of the resistor feedback network of the DAC output buffer. The resistors set the gain of the output stage of the device. Figure 8-2 of the datasheet doesn't provide much detail, but there is a better diagram in one of the app notes, that you can find here:
https://www.ti.com/lit/an/sbaa199/sbaa199.pdf
In the datasheet, we recommend a small series resistance of 15Ω (not 5kΩ as you mentioned in your post). This is shown in one of the application diagrams:
The small series resistance is used to prevent large currents from flowing from any external clamp at the device output through to the internal ESD cells. The series resistance limits the current during over-voltage events.
How do you have the OPA4170 connected? I don't think that 5kΩ is necessary. Where was it recommended?
Joseph Wu
