A good PCB layout for the LM4889MA/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-generating components can help reduce EMI.
The gain setting for the LM4889MA/NOPB depends on the specific application and the desired audio performance. A good starting point is to set the gain to 20 dB, and then adjust it based on the input signal level and the desired output level. It's also important to consider the noise floor and distortion characteristics of the device when optimizing the gain setting.
The maximum power dissipation for the LM4889MA/NOPB is 1.4 W. To ensure that it does not overheat, it's essential to provide adequate heat sinking, such as using a heat sink or a thermal pad, and to keep the device away from other heat-generating components. Additionally, ensuring good airflow and keeping the ambient temperature within the recommended range can help prevent overheating.
Yes, the LM4889MA/NOPB can be used in a stereo audio application. To configure it for stereo operation, you need to use two devices, one for the left channel and one for the right channel. The gain settings and input/output connections should be identical for both channels to ensure proper stereo operation.
The recommended input impedance for the LM4889MA/NOPB is 47 kΩ. A higher input impedance can result in a higher gain and a lower noise floor, but it may also increase the risk of oscillation. A lower input impedance can reduce the gain and increase the noise floor, but it may also improve the stability of the device.
LM4889MA/NOPB datasheet
by Texas Instruments
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