Other Parts Discussed in Thread: TPA2015D1
I understand that TPA2025 has a fixed gain of 20dB.
Can we use external circuit to reduce the gain? (For example using resistors?)
Objective is to maximise the dynamic range of MCU DAC, especially for low volume settings.
The DAC has a max voltage of ~3V, but with the fixed 20dB gain the amp will max it’s speaker output (~5V) with only 500mV input. That means to get a very low volume setting we’d need to reduce the DAC output waveform voltage to perhaps as low as 50mV, which really reduces our waveform resolution.
