Some parameters of ADC/DAC

1. Lsb,least significant Bit

The LSB is the weight of a bit at the lowest bit, and the ADC is a ruler, and the LSB is its smallest scale. lsb=vfs/(2^n), the VFS is full scale voltage,n is the resolution of the ADC (Resolution).

2. Offset Error

Offset error is often called Zero-scale error. Simply understood, for the ADC, the input analog signal, only offset (or overlay) offset error, in order to normal ad conversion, and for the DAC, the output of the analog signal, must be offset (or superimposed) offset error, in order to have a normal analog output. Multiple LSB or percent of VFS.

3. Gain Error

Even assuming that there is no offset ERROR,ADC/DAC input or output voltage, there will be a difference between measured and ideal. Gain error is in fact the amount of actual function and ideal function slope difference. A DAC function curve that moves the measured curve down the y-axis and remains parallel to the original curve, the difference between the voltage at the full scale is that the gain ERROR;ADC curve can be shifted along the x-axis and gain Error can be obtained. Its units are also lsb or percent of VFS.

4. Full scale Error

Full scale Error=gain Error+offset Error. The full scale error is the difference between the measured full scaled voltage and the ideal full rating vlotage, which is directly caused by two quantities, one offset error and the other gain error.

Figure a full-scale error for the ADC and a DAC. (from MaxiM)

5, Voltage Compliance Range (sometimes ' force-sense Outputs ' used)

Maxim's interpretation of force-sense output is that, when measuring, it must be assumed that the voltage or current at a certain point in the distance connected to the wire is a given value (forced value), and we measure the current or voltage generated in relation to this value.

Voltage compliance is translated into a submissive voltage,

Some parameters of ADC/DAC