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In the datasheets of a dac they talk about the INL error. As I understand this is to do with how much the output of the dac deviates from the output of an ideal DAC. So I was wondering how does that translate to how much the voltage will deviate in mV's? I'm using a MCP4922. The datasheet say it can be as high as +/- 12LSB.

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\$ V_{INL}=\frac{INL}{2^n}*V_{fullscale} \$ will get you what you want. Where N = number of bits.

INL is the deviation from an ideal straight line.

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