The OPA111AM can operate with a maximum power supply voltage of ±18V, but it's recommended to keep it below ±15V for optimal performance and to prevent overheating.
To ensure stability in a unity-gain configuration, add a 10-22nF capacitor between the output and the inverting input to prevent oscillations. This is especially important when using the OPA111AM with a high-impedance source or a long cable.
Use a star-grounding technique, where the grounds of the power supplies, analog circuits, and digital circuits are connected at a single point. Keep the OPA111AM's ground pin (pin 4) connected to the analog ground, and avoid running digital signals near the OPA111AM's inputs.
Use a low-pass filter or a ferrite bead on the power supply lines, and add a 10-100nF decoupling capacitor between the power supply pins and ground. Also, keep the OPA111AM away from high-current or high-frequency circuits, and use shielding or a metal enclosure to reduce EMI.
The OPA111AM can deliver up to 20mA of output current, but it's recommended to keep the output current below 10mA to ensure optimal performance and to prevent overheating.
OPA111AM datasheet
by Texas Instruments
