Use the OPA838EVM as a reference when designing the circuit board. TI recommends following the EVM layout of the external components near to the amplifier, ground plane construction, and power routing as closely as possible. Follow these general guidelines:

1. Signal routing must be direct and as short as possible into and out of the op amp.
2. Use a short and direct feedback path avoiding vias if possible.
3. Remove ground or power planes from directly under the negative input and output pins of the amplifier.
4. Place a series output resistor as close to the output pin as possible when driving capacitive or matched loads.
5. Place a 2.2-µF power-supply decoupling capacitor within two inches of the device and share with other op amps if desired. For split-supply operation, a capacitor is required for both supplies.
6. Place a 0.1-µF power-supply decoupling capacitor as close to the supply pins as possible, preferably within 0.1 inch. For split-supply operation, a capacitor is required for both supplies.
7. The PD pin uses logic levels referenced off the negative supply. If the pin is not used, tie the pin to the positive supply to enable the amplifier. If the pin is used, then actively drive the pin. A bypass capacitor is not necessary, but is used for EMI rejection in noisy environments.