A good PCB layout for the TPA6120A2DWP involves keeping the audio signal traces short and away from the power supply traces, using a solid ground plane, and placing the device close to the power supply decoupling capacitors. Additionally, using a shielded enclosure and minimizing the length of the input and output cables can help reduce EMI.
To optimize the gain setting, you need to consider the input signal level, the desired output level, and the impedance of the load. A good starting point is to set the gain to 20 dB (default) and then adjust it based on the specific requirements of your application. You can use the gain equation provided in the datasheet to calculate the optimal gain setting.
The TPA6120A2DWP has a thermal shutdown feature that activates when the junction temperature exceeds 150°C. To ensure reliable operation, make sure to provide adequate heat sinking, use a thermal pad or heat sink, and keep the device away from other heat sources. You should also ensure good airflow and avoid blocking the airflow around the device.
To filter out noise and hum, you can use a combination of passive and active filtering techniques. Use a low-pass filter at the input to remove high-frequency noise, and a high-pass filter at the output to remove DC offset and hum. You can also use a noise filter capacitor between the output and ground to reduce noise.
The TPA6120A2DWP has built-in ESD protection, but it's still important to take precautions during handling and assembly to prevent damage. Use an ESD wrist strap or mat, handle the device by the body or pins, and avoid touching the pins or leads. You should also use ESD-protected storage and shipping materials.
TPA6120A2DWP datasheet
by Texas Instruments
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