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LM1875: LM1875 FFT to rise

Part Number: LM1875

It is found that the FFT performance is different between different IC when tested with AP, there's a 10dB difference. What is the range of this values?

The blue line is relatively flat - around 120dB.

The red line starts at 4K and goes up in end around 110dB.

The difference between the two device is 10dB. Is it within the parameter range?