Texas Instruments provides a recommended PCB layout in the datasheet, but it's also important to follow general best practices for audio circuit board design, such as separating analog and digital grounds, using a star-ground configuration, and minimizing trace lengths and loops.
Proper biasing of the LM4917 involves setting the correct voltage on the VCC pin and ensuring that the input and output capacitors are properly sized and placed. The datasheet provides guidelines for biasing, but it's also important to consider the specific requirements of your application and the characteristics of your input and output signals.
The maximum power dissipation of the LM4917 is dependent on the ambient temperature and the thermal resistance of the package. The datasheet provides a thermal resistance value, and you can use this to calculate the maximum power dissipation for your specific application. To ensure the device doesn't overheat, make sure to provide adequate heat sinking, such as a thermal pad or heat sink, and ensure good airflow around the device.
The LM4917 has built-in EMI filtering, but you may still need to add additional filtering components to your circuit to meet your specific noise and EMI requirements. This can include adding capacitors, inductors, or resistors to filter out high-frequency noise, as well as using shielding and grounding techniques to reduce EMI.
Yes, the LM4917 can be used in a stereo audio application by using two devices, one for each channel. You'll need to configure each device separately, using the same input and output capacitors and resistors, and ensuring that the grounds are properly connected. You may also need to add additional components, such as a stereo codec or audio processor, to handle the stereo audio signals.
LM4917MTX/NOPB datasheet
by Texas Instruments
