I'm designing a resistance measurement device using an LT3092 current source. I've used a DIP switch to select different current ranges, which switches in different sense resistors.
The LT3092 uses a 10uA reference to set the output current, and the datasheet recommends a guard ring (tied to the output pin) around the set pin, on all board layers. This gives me two issues:
The DIP switch means that there's more traces than usual connected to the set pin, meaning the guard ring has to be large.
The set pin (5) and power in (+24V, pins 7,8) are next to each other, separated by an NC pin (6). This leaves the power pins inside the guard ring, which seems less than ideal.
I've attached screenshots of the PCB layout and render (for context). What's the best way to proceed here? Thanks!