A good PCB layout for the LM4860MX involves keeping the input and output traces short and symmetrical, using a solid ground plane, and placing the decoupling capacitors close to the device. A 4-layer PCB with a dedicated power plane and a solid ground plane is recommended.
The gain resistors (Rf and Ri) should be chosen based on the desired gain and input impedance. A higher gain requires smaller resistors, while a higher input impedance requires larger resistors. The datasheet provides a gain resistor calculator to help with the selection.
The maximum power dissipation of the LM4860MX is dependent on the ambient temperature and the thermal resistance of the package. The datasheet provides a power dissipation calculator to help determine the maximum power dissipation for a given application.
To filter out noise and EMI, use a low-pass filter or a ferrite bead in series with the input signal, and a decoupling capacitor between the power supply and ground. Additionally, use a shielded cable and keep the audio circuitry away from noisy components.
The recommended operating voltage range for the LM4860MX is 2.7V to 5.5V. Operating the device outside of this range may affect its performance and reliability.
LM4860MX/NOPB datasheet
by Texas Instruments
