47.4.2 Analog-to-Digital (ADC) Characteristics

Table 47-7. Differential Mode ⁽¹⁾⁽²⁾
Symbol	Parameters	Conditions		Measurements			Unit
Symbol	Parameters	Conditions		Min.	Typ.	Max.	Unit
ENOB	Effective Number of bits	Fadc = 1Msps	Vref = 2.0V Vddana = 3.0V	9.1	10.2	10.8	bits
			Vref = 1.0V Vddana = 1.62V to 3.6V	9.0	10.1	10.6
			Vref = Vddana = 1.62V to 3.6V	8.9	9.9	11.0
			Bandgap Reference, Vddana = 1.62V to 3.6V	9.0	9.8	10.6
TUE	Total Unadjusted Error	without offset and gain compensation	Vref = Vddana = 1.62V to 3.6V	-	7	32	LSB
INL	Integral Non Linearity	without offset and gain compensation	Vref = Vddana = 1.62V to 3.6V	-	+/-1.9	+/-4.8
DNL	Differential Non Linearity	without offset and gain compensation	Vref = Vddana = 1.62V to 3.6V	-	+0.94/-1	+1.85/-1
Gain	Gain Error	without gain compensation	Vref = 1V Vddana = 1.62V to 3.6V	-	+/-0.38	+/-1.9	%
			Vref = 3V Vddana = 1.62V to 3.6V	-	+/-0.14	+/-0.9
			Bandgap Reference	-	+/-0.64	+/-5.4
			Vref = Vddana = 1.62V to 3.6V	-	+/-0.15	+/-0.9
Offset	Offset Error	without offset compensation	Vref = 1V Vddana = 1.62V to 3.6V	-	+/-0.13	+/-15.8	mV
			Vref = 3V Vddana = 1.62V to 3.6V	-	+/-1.82	+/-14.9
			Bandgap Reference	-	+/-2.07	+/-15.8
			Vref = Vddana = 1.62V to 3.6V	-	+/-1.82	+/-15.3
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:

These values are given without any ADC oversampling and decimation features enabled.
These values are based on characterization, and are not covered in test limits in production.

Table 47-8. Single- Ended Mode ⁽¹⁾⁽²⁾
Symbol	Parameters	Conditions		Measurements			Unit
Symbol	Parameters	Conditions		Min.	Typ.	Max.	Unit
ENOB	Effective Number of bits	Fadc = 1Msps	Vref = 2.0V Vddana = 3.0V	8.0	9.3	9.7	bits
			Vref = 1.0V Vddana = 1.62V to 3.6V	7.9	8.2	9.4
			Vref = Vddana = 1.62V to 3.6V	8.6	9.2	9.9
			Bandgap Reference, Vddana = 1.62V 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	66	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 = 1.62V to 3.6V	-	+/-0.3	+/-5.1	%
			Vref = 3V Vddana = 1.62V to 3.6V	-	+/-0.3	+/-5.1
			Bandgap Reference	-	+/-0.4	+/-5.1
			Vref = Vddana = 1.62V to 3.6V	-	+/-0.2	+/-0.8
Offset	Offset Error	without offset compensation	Vref = 1V Vddana = 1.62V to 3.6V	-	+/-2.6	+/-48	mV
			Vref = 3V Vddana = 1.62V to 3.6V	-	+/-2.6	+/-48
			Bandgap Reference	-	+/-1.3	+/-35
			Vref = Vddana = 1.62V to 3.6V	-	+/-1.8	+/-38
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:

These values are given without any ADC oversampling and decimation features enabled.
These values are based on characterization, and are not covered in test limits in production.

The minimum sampling time t_samplehold for a given R_source can be found using this formula:

$t_{samplehold} \geq (R_{sample} + R_{source}) \times (C_{sample}) \times (n + 2) \times \ln (2)$

For 12-bit accuracy:

$t_{samplehold} \geq (R_{sample} + R_{source}) \times (C_{sample}) \times 9.7$