Analog-to-Digital Converter (ADC) Characteristics

Table 1. 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=1.8V 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

Notes:

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 2. 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=1.8V 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

Notes:

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 1. ADC Analog Input AINx

The minimum sampling time t_samplehold for a given R_source can be calculated using the following formula:

tsamplehold≥(Rsample+Rsource)×(Csample)×(n+2)×ln⁡(2)

For 12-bit accuracy:

tsamplehold≥(Rsample+Rsource)×(Csample)×9.7