46.10.5 Analog-to-Digital Converter (ADC) Characteristics

Table 46-22. Operating Conditions
Symbol	Parameters	Conditions	Min.	Typ.	Max.	Unit
RES	Resolution	-	-	-	12	bits
	Conversion speed	-	10	-	1000	ksps
fs	Sampling clock	-	10	-	1000	kHz
clk	ADC Clock frequency	-	-	fs.16	-	Hz
T_S	Sampling time	OFFCOMP=1	250	-	25000	ns
	Conversion range	Diff mode	-V_REF	-	V_REF	V
	Conversion range	Single-Ended mode	0	-	V_REF	V
V_REF	Reference input	REFCOMP=1	1	-	V_DDANA-0.6	V
V_REF	Reference input	REFCOMP=0	V_DDANA	-	V_DDANA	V
V_IN	Input channel range	-	0	-	V_DDANA	V
V_CMIN	Input common mode voltage	For V_REF > 1.0V	0.7	-	V_REF-0.7	V
V_CMIN	Input common mode voltage	For V_REF=1.0V	0.3	-	V_REF-0.3	V
CSAMPLE⁽¹⁾	Input sampling capacitance	-	-	2.8	3.2	pF
RSAMPLE⁽¹⁾	Input sampling on-resistance	-	-	-	1715	Ω
Rref⁽¹⁾	Reference input source resistance	REFCOMP=1	-	-	5	kΩ

Note:

These values are based on simulation. They are not covered by production test limits or characterization.
The ADC channels on pins PB00, PB01, PB02 and PB03 are powered, depending on VSWOUT, from the VDDIN or VBAT power supply. The ADC performance of these pins will be lower than on all the other ADC channels on pins powered from the VDDANA power supply.

Table 46-23. Power Consumption⁽¹⁾
Symbol	Parameters	Conditions	Ta	Min.	Typ.	Max.	Unit
I_DDANA	Differential Mode	fs=1Msps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=V_REF=1.6V	Max.85°C Typ.25°C	-	105	128	µA
	Differential Mode	fs=1Msps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=V_REF=3.6V		-	279	307	µA
	Differential Mode	fs=1Msps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=1.6V, V_REF=1.0V		-	175	231	µA
		fs=1Msps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.0V, V_REF=2.0V		-	300	374
		fs=1Msps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.6V, V_REF=3.0V		-	356	438
	Differential Mode	fs=10ksps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=V_REF=1.6V		-	30	41	µA
	Differential Mode	fs=10ksps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_CC=V_REF=3.6V		-	53	71	µA
	Differential Mode	fs=10ksps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=1.6V, V_REF=1.0V		-	95	139	µA
		fs=10ksps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.0V, V_REF=2.0V		-	115	178
		fs=10ksps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.6V, V_REF=3.0V		-	122	187
I_DDANA	Single-Ended Mode	fs=1Msps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=V_REF=1.6V	Max.85°C Typ.25°C	-	138	158	µA
	Single-Ended Mode	fs=1Msps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=V_REF=3.6V		-	321	359	µA
	Single-Ended Mode	fs=1Msps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=1.6V, V_REF=1.0V		-	203	257	µA
		fs=1Msps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.0V, V_REF=2.0V		-	331	413
		fs=1Msps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.6V, V_REF=3.0V		-	388	482
	Single-Ended Mode	fs=10ksps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_CC=V_REF=1.6V		-	46	62	µA
	Single-Ended Mode	fs=10ksps / Reference buffer disabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=V_REF=3.6V		-	89	120	µA
	Single-Ended Mode	fs=10ksps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_CC=1.6V, V_REF=1.0V		-	109	157	µA
		fs=10ksps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.0V, V_REF=2.0V		-	138	211
		fs=10ksps / Reference buffer enabled BIASREFBUF='111', BIASCOMP='111' V_DDANA=3.6V, V_REF=3.0V		-	148	228

Note: 1. These values are based on characterization.

Table 46-24. Differential Mode⁽¹⁾
Symbol	Parameters	Conditions	Min.	Typ.	Max.	Unit
ENOB	Effective Number of bits	V_DDANA=3.0V / V_ref =2.0V	9.6	10.5	10.6	bits
		V_DDANA=1.6V/3.6V V_ref=1.0V	8.9	9.7	9.9
		V_DDANA=V_ref=1.6V	10	10.5	11.1
		V_DDANA=V_ref=3.6V	10.5	10.9	11.0
TUE	Total Unadjusted Error	V_DDANA=3.0V, V_ref=2.0V	-	7.5	11	LSB
INL	Integral Non Linearity	V_DDANA=3.0V, V_ref=2.0V	-	+/-1.5	+/-2.1	LSB
DNL	Differential Non Linearity	V_DDANA=3.0V, V_ref=2.0V	-	+/-0.8	+1.1/-1.0	LSB
	Gain Error	External Reference voltage 1.0V	-	+/-0.7	+/-1.5	%
		External Reference voltage 3.0V	-	+/-0.2	+/-0.5
		Reference bandgap voltage	-	+/-0.4	+/-4.4
		VDDANA	-	+/-0.1	+/-0.4
		VDDANA/2	-	+/-0.4	+/-1.3
		VDDANA/1.6	-	+/-0.3	+/-0.9
	Offset Error	External Reference voltage 1.0V	-	+/-1.1	+/-2.4	mV
		External Reference voltage 3.0V	-	+/-1.1	+/-3
		Reference bandgap voltage	-	+/-2.3	+/-7.5
		VDDANA	-	+/-0.9	+/-2.9
		VDDANA/2	-	+/-1	+/-2.6
		VDDANA/1.6	-	+/-1	+/-2.9
SFDR	Spurious Free Dynamic Range	Fs=1MHz / Fin=13 kHz / Full range Input signal V_DDANA=3.0V, V_ref=2.0V	68	75	77	dB
SINAD	Signal to Noise and Distortion ratio		60	65	66
SNR	Signal to Noise ratio		61	66	67
THD	Total Harmonic Distortion		-74	-73	-67
	Noise RMS	External Reference voltage	-	1.0	2.5	mV

Note: 1. These values are based on characterization.

Table 46-25. Single-Ended Mode⁽¹⁾
Symbol	Parameters	Conditions	Min.	Typ.	Max.	Unit
ENOB	Effective Number of bits	V_DDANA=3.0V / V_ref =2.0V	8.5	9.5	9.8	bits
		V_DDANA=1.6V/3.6V V_ref=1.0V	7.5	8.7	8.9
		V_DDANA=V_ref=1.6V ⁽²⁾	9.0	9.5	9.8
		V_DDANA=V_ref=3.6V	9.2	9.8	9.9
TUE	Total Unadjusted Error	V_DDANA=3.0V, V_ref=2.0V	-	17.4	31	LSB
INL	Integral Non Linearity	V_DDANA=3.0V, V_ref=2.0V	-	+/-2.2	+/-10.1	LSB
DNL	Differential Non Linearity	V_DDANA=3.0V, V_ref=2.0V	-	+/-0.8	+/-0.9	LSB
	Gain Error	External Reference voltage 1.0V	-	+/-1	+/-1.3	%
		External Reference voltage 3.0V	-	+/-0.3	+/-0.6
		Reference bandgap voltage	-	+/-0.4	+/-3.2
		V_ref=V_DDANA ⁽²⁾	-	+/-0.1	+/-0.3
		V_ref=V_DDANA/2	-	+/-0.6	+/-1.4
		V_ref=V_DDANA/1.6	-	+/-0.4	+/-1
	Offset Error	External Reference voltage 1.0V	-	+/-3.4	+/-13	mV
		External Reference voltage 3.0V	-	+/-3.6	+/-24
		Reference bandgap voltage	-	+/-1	+/-14
		V_ref=V_DDANA ⁽²⁾	-	+/-4.2	+/-25
		V_ref=V_DDANA/2	-	+/-5.7	+/-10
		V_ref=V_DDANA/1.6	-	+/-6.3	+/-13
SFDR	Spurious Free Dynamic Range	Fs=1MHz / Fin=13kHz / Full range Input signal V_DDANA=3.0V, V_ref=2.0V	65	71	78	dB
SINAD	Signal to Noise and Distortion ratio		53	59	61
SNR	Signal to Noise ratio		53	59	61
THD	Total Harmonic Distortion		-76	-70	-64
	Noise RMS	External Reference voltage	-	2.0	7.0	mV

Note:

These values are based on characterization.
All parameters given above exclude the corner V_DDANA = V_ref = 1.6V, Ta = -40°C.

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:

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

SAM L21

46.10.5 Analog-to-Digital Converter (ADC) Characteristics