The inputs to the EVM can be any signal within the common-mode voltage range. BNC connectors are available at both inputs to allow for easy interfacing with signal generators or other equipment. Additionally, signals can be input using test points TP12 (IN–) and TP14 (IN+).

Jumpers J7 and J10 set the voltages seen at IN– and IN+, respectively. Short pins 2 and 3 of these jumpers to set the inputs to GND. Short pins 1 and 2 to allow whatever voltages present at the input BNCs to be passed to the op amp.

The OPA455 non-inverting input may be set up to have a voltage divider in its path. PC board resistor locations R8 and R12 would need to be populated with the appropriate divider resistances. A jumper is then added between J12, pins 2 and 3, to complete the divider. Additionally, J12 may be used to route an externally-applied reference voltage from the TP15 (VREF Ext) test point, to the OPA455 non-inverting input. A jumper is placed across J12, pins 1 and 2, to establish the connection.