C8051F52x-53x
Measurement
To obtain these values the following steps are performed:
1. A number of samples of different production lots that is large enough to ensure statistical sig-
nificance are selected.
2. The samples are tested by injecting a precise analog signal sweeping through the entire ADC
range.
3. The ADC transition point values are compared with the ideal transition point values and the
distance (DNL) from symbol to symbol is calculated.
4. The maximum difference between the actual step and the ideal one (in LSBs) represents the
DNL value for the sample.
5.6.4. Offset
The offset error is calculated as the difference between the first bit transition point and the ideal first bit
transition point.
Measurement
1. A number of samples of different production lots that is large enough to ensure statistical sig-
nificance are selected.
2. The samples are tested by injecting a precise analog signal sweeping from through the entire
ADC range.
3. The first ADC transition point is measured and compared with the ideal value.
4. The maximum difference between the first actual step and the ideal one (in LSBs) represents
the offset error for the sample.
5.6.5. Full-Scale
The full-scale error is calculated as the difference between the last bit transition point measured and the
ideal last bit transition point in LSBs.
Measurement
1. A number of samples of different production lots that is large enough to ensure statistical sig-
nificance are selected.
2. The samples are tested by injecting a precise analog signal sweeping from through the entire
ADC range.
3. The last ADC transition point is measured and compared with the ideal value
4. The maximum difference between the last actual step and the ideal one (in LSBs) represents
the full scale error for the sample.
5.6.6. Signal to Noise Plus Distortion
The Signal to Noise plus Distortion is the ratio of the RMS signal amplitude (10 kHz single ended sine-
wave input set to 1 dB below full scale) to the RMS sum of all other spectral components, including the har-
monics but excluding dc.
58
Rev. 0.3
SILICON [ SILICON ]
