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TLV320ADC3101: dc voltage measurement

Part Number: TLV320ADC3101

Hi,

I am using TLV320ADC3101 to measure DC voltage.

Now the chip works fine, I can read outputs with i2s through DOUT.

But I don't know how to calculate real-time Voltage of analog pins such as IN1L(P). 

Could you help to provide some formula to calculate the DC voltage? 

Thanks,

Burton

  • Hello Burton,

    Here is a visual to help represent the ideal transfer function of the TLV320ADC3101.  The full-scale input level is 0.707Vrms or 2Vpp ideally, but there will be non-zero gain errors that will shift the curve from part-to-part.  The TLV320ADC3101 is specified with a single-ended gain error of 0.7dB typical and there will be a roughly +/-0.5dB distribution around that center value.

    The output codes in I2S are standard binary two's complement formatted.

  • Thank you Collin very much. You resolved my issue.