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EFM32WG980 Datasheet(PDF) 38 Page - List of Unclassifed Manufacturers |
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EFM32WG980 Datasheet(HTML) 38 Page - List of Unclassifed Manufacturers |
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38 / 80 page  Preliminary ...the world's most energy friendly microcontrollers 2013-05-06 - EFM32WG980FXX - d0202_Rev1.10 38 www.energymicro.com Symbol Parameter Condition Min Typ Max Unit 200 kSamples/s, 12 bit, differ- ential, 2xVDD reference 79 dBc After calibration, single ended 0.3 mV VADCOFFSET Offset voltage After calibration, differential 0.3 mV -1.92 mV/°C TGRADADCTH Thermometer output gradi- ent -6.3 ADC Codes/ °C DNLADC Differential non-linearity (DNL) ±0.7 LSB INLADC Integral non-linearity (INL), End point method ±1.2 LSB MCADC No missing codes 11.999 1 12 bits 1.25V reference 0.01 2 0.033 3 %/°C GAINED Gain error drift 2.5V reference 0.01 2 0.03 3 %/°C 1.25V reference 0.2 2 0.7 3 LSB/°C OFFSETED Offset error drift 2.5V reference 0.2 2 0.62 3 LSB/°C 1On the average every ADC will have one missing code, most likely to appear around 2048 +/- n*512 where n can be a value in the set {-3, -2, -1, 1, 2, 3}. There will be no missing code around 2048, and in spite of the missing code the ADC will be monotonic at all times so that a response to a slowly increasing input will always be a slowly increasing output. Around the one code that is missing, the neighbour codes will look wider in the DNL plot. The spectra will show spurs on the level of -78dBc for a full scale input for chips that have the missing code issue. 2Typical numbers given by abs(Mean) / (85 - 25). 3Max number given by (abs(Mean) + 3x stddev) / (85 - 25). The integral non-linearity (INL) and differential non-linearity parameters are explained in Figure 3.28 (p. 38) and Figure 3.29 (p. 39) , respectively. Figure 3.28. Integral Non-Linearity (INL) Ideal t ransfer curve Digit al ouput code Analog Input INL= |[ (VD-VSS)/VLSBIDEAL] - D| where 0 < D < 2 N - 1 0 1 2 3 4092 4093 4094 4095 VOFFSET Act ual ADC t ranfer funct ion before offset and gain correct ion Act ual ADC t ranfer funct ion aft er offset and gain correct ion INL Error (End Point INL) |
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