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1.R1711(R1) to 5.6H ohm and R1710(R2) to un-mount,
2.SYNC PD 100K ohm.
the speaker output also have an audio ~400KHz / 400mV output without input signal.
The TPA3130D2 is for Woofer application, the range of working frequency is 20~300Hz.
When playing 200Hz sound, the output after LC filter is 200Hz waveform and 400KHz will also be loaded on.
We will also measure on our AP later. Does the 400K Hz signal affect woofer's sound quality or THD?
400KHz Fsw frequency noise does not affect audio performance(20Hz-20KHz). When you test using AP instrument, you should select AES-17 filter to filter the noise.The datasheet typical data in 6.7 Part is captured on 400KHz Fsw.
It does not need divide audio input to test THD.
Did you select AES-17 filter on AP instrument? and did you check a-weighting noise value?
If a-weighting noise can be correlated to datasheet(Table 6.6, 65uV @20dB), it shows the setup is no problem.
attached the electrical output signal THD measurement.
Yes, green plot is output voltage and blue plot is output THD.
Add THD table from TPA3130 datasheet into the electrical output signal THD file.
Test Condition : BD Mode/ Gain :20dB/ 4 Ohm@5W speaker/ PVCC 20V
For woofer application, there is a 300Hz filter.
The THD increase between 100Hz~300Hz, Is this the correct value?