OPA1622 SoundPlus™ High-Fidelity, Bipolar-Input, Audio Operational Amplifier (Rev. B)
SBOS727B – November2015 – revisedMay 2016
10.1 Layout Guidelines
For best operational performance of the device, use good printed circuit board (PCB) layout practices, including:
- Connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as close to the device as possible. A single bypass capacitor from V+ to ground is applicable for single-supply applications. The bypass capacitors are used to reduce the coupled noise by providing low-impedance power sources local to the analog circuitry, because noise can propagate into analog circuitry through the power pins of the circuit as a whole and the op amp specifically.
- Connect the IC ground pin to a low-impedance, low-noise, system reference point, such as an analog ground.
- Place the external components as close to the device as possible. As shown in Figure 60, keep feedback resistors close to the inverting input to minimize parasitic capacitance and the feedback loop area.
- Keep the length of input traces as short as possible. Always remember that the input traces are the most sensitive part of the circuit.
- For proper amplifier function, connect the package thermal pad to the most negative supply voltage (VEE).
10.2 Layout Example
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