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 solid ground plane, and minimizing trace lengths and widths.
Proper biasing is critical for the LM4930LQ. Ensure that the voltage supply is within the recommended range (2.7V to 5.5V), and that the input and output capacitors are properly sized and placed. Additionally, ensure that the gain-setting resistors are correctly sized and matched to achieve the desired gain.
The LM4930LQ is a low-power audio amplifier, and its maximum power handling capability is limited. The device can deliver up to 1.4W of power into a 4Ω load, but it's essential to ensure that the output stage is properly heat-sinked to prevent overheating and damage.
To reduce noise and hum, ensure that the power supply is well-regulated and filtered, and that the input and output stages are properly shielded. Additionally, use a low-noise voltage regulator, and consider adding noise-reducing components such as ferrite beads or common-mode chokes.
Yes, the LM4930LQ can be used in stereo audio applications. However, it's essential to use two separate devices, one for each channel, and to ensure that the gain-setting resistors and input/output capacitors are properly matched and sized for each channel.
LM4930LQ/NOPB datasheet
by Texas Instruments
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