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What is full-scale error of AD a converter?
The full-scale gain error of an digital-to-analog converter (DAC) is the difference between the actual and the ideal output span. The actual span is determined by the output when all inputs are set to 1s, minus the output when all inputs are set to 0s.
What is gain error in ADC?
Analog-to-Digital Converter (ADC) gain error is defined as the deviation of the last step’s midpoint of the actual ADC from the last step’s midpoint of the ideal ADC, compensating for offset error. After compensating for offset errors, applying an input voltage of 0 always results in an output value of 0.
What does a DNL error on an ADC mean?
The key for good performance for an ADC is the claim “no missing codes.” This means that, as the input voltage is swept over its range, all output code combinations will appear at the converter output. A DNL error of <±1LSB guarantees no missing codes (Figure 1a). In Figures 1b, 1c, and 1d, three DNL error values are shown.
When is a DNL error positive or negative?
The input-voltage level required to create the transition at code [N] is compared to that at code [N+1]. If the difference is 1LSB apart, the DNL error is zero. If it is greater than 1LSB, the DNL error is positive; if it is less than 1LSB, the DNL error is negative. Having missing codes is not necessarily bad.
What does the DNL error at Ain mean?
DNL error: At AIN* the digital code can be one of three possible values. When the input voltage is swept, Code 10 will be missing. When DNL-error values are offset (that is, -1LSB, +2LSB), the ADC transfer function is altered. Offset DNL values can still in theory have no missing codes. The key is having -1LSB as the low limit.
What happens when code 10 is missing in ADC?
When the input voltage is swept, Code 10 will be missing. When DNL-error values are offset (that is, -1LSB, +2LSB), the ADC transfer function is altered. Offset DNL values can still in theory have no missing codes. The key is having -1LSB as the low limit.