Tool/software:
Hi,
Could you tell me how how to calculate DC voltage from PCM1864's Secondary ADC value.
I want to get DC voltage from VINL1 input pin.
AUXADC_DATA_CTRL register(Register 88) was written value 0xF0.
Secondary ADC Input Channel register(Register 10) was written value 0x01.
Then I could get some values from ADCAUX_DATA register (Register 89,90) as blow.
ADCAUX_MSB: 0xA7, ADCAUX_LSB:B9, VINL1 input voltage: 0.963V
ADCAUX_MSB: 0x8e, ADCAUX_LSB:95, VINL1 input voltage: 0.458V
DC voltage = ADC Value/32768 × 4.3V
The actual voltage does not match the value calculated by the above formula.
Let me know how to calculate it correctly.