A good PCB layout for the LM4889MM/NOPB involves keeping the audio signal traces away from the power supply and ground planes, 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 audio signal traces can help reduce EMI.
The gain setting for the LM4889MM/NOPB depends on the specific application and 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 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 LM4889MM/NOPB is 1.4 W. To ensure reliable operation, it's essential to provide adequate heat sinking, such as a thermal pad or heat sink, and to keep the device within the recommended operating temperature range of -40°C to 85°C.
Yes, the LM4889MM/NOPB can be used in a stereo audio application. To configure it for stereo operation, connect the left and right audio channels to separate input pins, and use the device's internal mute function to synchronize the channels. Additionally, ensure that the power supply and ground connections are properly decoupled to minimize crosstalk between channels.
The LM4889MM/NOPB is a high-performance, low-power audio amplifier with a unique combination of features, including a high signal-to-noise ratio, low distortion, and low quiescent current. Compared to other audio amplifiers from Texas Instruments, the LM4889MM/NOPB offers a higher power supply rejection ratio, lower noise floor, and improved thermal performance.
LM4889MM/NOPB datasheet
by Texas Instruments
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