The OPA838 EVM can be used 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. General guidelines are listed below:

1. Signal routing must be direct and as short as possible into and out of the op amp.
2. The feedback path must be short and direct avoiding vias if possible.
3. Ground or power planes must be removed from directly under the negative input and output pins of the amplifier.
4. TI recommends placing a series output resistor as close to the output pin as possible when driving capacitive or matched loads.
5. A 2.2-µF power-supply decoupling capacitor must be placed within two inches of the device and can be shared with other op amps. For split-supply operation, a capacitor is required for both supplies.
6. A 0.1-µF power-supply decoupling capacitor must be placed 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, the pin must tie to the positive supply to enable the amplifier. If the pin is used, the pin must be actively driven. A bypass capacitor is not necessary, but is used for EMI rejection in noisy environments.