A good PCB layout for the LM4880M/NOPB involves keeping the audio signal traces away from the power supply and ground planes, using a solid ground plane, and minimizing the length of the audio signal traces. Additionally, using a shielded enclosure and keeping the device away from other noise sources can help reduce EMI.
To optimize the gain setting, you need to consider the input signal level, desired output level, and the gain range of the LM4880M/NOPB. Start with the recommended gain setting in the datasheet and adjust it based on your specific application requirements. You may need to use an external resistor or potentiometer to fine-tune the gain.
The LM4880M/NOPB has a maximum junction temperature of 150°C. To ensure reliable operation, ensure good airflow around the device, use a heat sink if necessary, and avoid overheating the device. You can also use thermal simulation tools to estimate the device's temperature and optimize the thermal design.
To filter out noise and hum, you can use external filters such as RC filters or active filters. You can also use the LM4880M/NOPB's built-in filters, such as the high-pass filter, to remove low-frequency noise. Additionally, using a shielded cable and a well-designed PCB layout can help reduce noise and hum.
The LM4880M/NOPB requires a single 5V power supply. To ensure a stable power supply, use a high-quality voltage regulator, decouple the power supply lines with capacitors, and use a low-dropout regulator if necessary. You can also use a power supply filter to reduce noise and ripple.
LM4880M/NOPB datasheet
by Texas Instruments
