48.6.2 Analog-to-Digital Converter (ADC) Characteristics

Table 48-10. Differential Mode (1,2)
Symbol Parameters Conditions Measurements Unit
Min. Typ. Max.
ENOB Effective Number of bits Fadc = 1Msps Vref=2.0V Vddana=3.0V 9.1 10.2 10.8 bits
Vref=1.0V Vddana=1.8V to 3.6V 9.0 10.1 10.6
Vref=Vddana=1.8V to 3.6V 8.9 9.9 11.0
Bandgap Reference, Vddana=1.8V to 3.6V 9.0 9.8 10.6
TUE Total Unadjusted Error without offset and gain compensation Vref=Vddana=1.8V to 3.6V - 7 38 LSB
INL Integral Non Linearity without offset and gain compensation Vref=Vddana=1.8V to 3.6V - +/-1.9 +/-4.8
DNL Differential Non Linearity without offset and gain compensation Vref=Vddana=1.8V to 3.6V - +0.94/-1 +1.85/-1
Gain Gain Error without gain compensation Vref=1V Vddana=1.8V to 3.6V - +/-0.38 +/-2.2 %
Vref=3V Vddana=1.8V to 3.6V - +/-0.14 +/-1
Bandgap Reference - +/-0.64 +/-6.6
Vref=Vddana=1.8V to 3.6V - +/-0.15 +/-1
Offset Offset Error without offset compensation Vref=1V Vddana=1.8V to 3.6V - +/-0.13 +/-19.5 mV
Vref=3V Vddana=1.8V to 3.6V - +/-1.82 +/-18.3
Bandgap Reference - +/-2.07 +/-19.4
Vref=Vddana=1.8V to 3.6V - +/-1.82 +/-18.6
SFDR Spurious Free Dynamic Range Fs = 1MHz / Fin = 13 kHz / Full range Input signal Vref=2.0V Vddana=3.0V 58.1 70.5 77.5 dB
SINAD Signal-to-Noise and Distortion ratio 56.7 63.4 66.5
SNR Signal-to-Noise ratio 56.5 64.4 67.1
THD Total Harmonic Distortion -74.7 -68.7 -57.7
Noise RMS External Reference voltage External Reference voltage - 0.42 - mV
Note:
  1. These values are given without any ADC oversampling and decimation features enabled.
  2. These values are based on characterization, and are not covered in test limits in production.
Table 48-11. Single- Ended Mode (1)(2)
Symbol Parameters Conditions Measurements Unit
Min. Typ. Max.
ENOB Effective Number of bits Fadc = 1Msps Vref=2.0V Vddana=3.0V 8.0 9.3 9.7 bits
Vref=1.0V Vddana=1.8V to 3.6V 7.9 8.2 9.4
Vref=Vddana=1.8V to 3.6V 8.6 9.2 9.9
Bandgap Reference, Vddana=1.8V to 3.6V 7.8 8.4 8.9
TUE Total Unadjusted Error without offset and gain compensation Vref=2.0V Vddana=3.0V - 12 77 LSB
INL Integral Non Linearity without offset and gain compensation Vref=2.0V Vddana=3.0V - +/-3.4 +/-9.1
DNL Differential Non Linearity without offset and gain compensation Vref=2.0V Vddana=3.0V - +0.9/-1 +1.8/-1
Gain Gain Error without gain compensation Vref=1V Vddana=1.8V to 3.6V - +/-0.3 +/-6.3 %
Vref=3V Vddana=1.8V to 3.6V - +/-0.3 +/-6.3
Bandgap Reference - +/-0.4 +/-6.3
Vref=Vddana=1.8V to 3.6V - +/-0.2 +/-0.9
Offset Offset Error without offset compensation Vref=1V Vddana=1.8V to 3.6V - +/-2.6 +/-58 mV
Vref=3V Vddana=1.8V to 3.6V - +/-2.6 +/-58
Bandgap Reference - +/-1.3 +/-42.4
Vref=Vddana=1.8V to 3.6V - +/-1.8 +/-46.6
SFDR Spurious Free Dynamic Range Fs = 1 MHz / Fin = 13 kHz / Full range Input signal Vref=2.0V Vddana=3.0V 56.1 63.8 72.6 dB
SINAD Signal-to-Noise and Distortion ratio 50.0 57.7 60.1
SNR Signal-to-Noise ratio 51.9 58.3 59.8
THD Total Harmonic Distortion -72.5 -62.4 -52.3
Noise RMS External Reference voltage External Reference voltage - 0.80 - mV
Note:
  1. These values are given without any ADC oversampling and decimation features enabled.
  2. These values are based on characterization, and are not covered in the test limits in production.
Figure 48-1. ADC Analog Input AINx
The minimum sampling time tsamplehold for a given Rsource can be calculated using the following formula:

t samplehold ( R sample + R source ) × ( C sample ) × ( n + 2 ) × ln ( 2 )

For 12-bit accuracy:

t samplehold ( R sample + R source ) × ( C sample ) × 9.7