49.21 ADC Electrical Specifications

Table 49-25. ADC Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.62V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
Device Supply
ADC_1	AVDD	ADC Module Supply	AVDD(min)	—	AVDD(max)	V	—
Reference Inputs
ADC_3	VREF ⁽¹⁾	ADC Reference Voltage	2.4	—	AVDD	V	VREF = AVDD (REFCTRL.REFSEL = 0x5)
ADC_3	VREF ⁽¹⁾	ADC Reference Voltage	2.4	—	AVDD-0.6	V	VREF != AVDD (REFCTRL.REFSEL != 0x5)
Analog Input Range
ADC_7	A_FS	Full-Scale Analog Input Signal Range	AVSS	—	VREF	V	Single-Ended Mode
ADC_7	A_FS	Full-Scale Analog Input Signal Range	-VREF	—	VREF	V	Differential Mode
ADC_9	V_CMIN	Input Common Mode Voltage	0.7	—	VREF-0.7	V	—
ADC_11	T_SETTLING	ADC Stabilization Time	—	10	—	µs	CTRLA.ENABLE=1 or CTRLA.ONDEMAND=1

Note:

ADC functional device operation with external VREF<2.4V is functional, but not characterized. ADC will function, but with degraded accuracy of approximately ~((0.06 * 2n) / VREF) LSB’s over full scale range, where "n"=#bits. ADC accuracy is limited by internal VREF accuracy + drift, MCU generated noise plus users application noise/accuracy on AVDD, AVSS.

Table 49-26. ADC Single Ended Mode Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.62V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
SINGLE ENDED MODE ADC Accuracy ⁽³⁾
SADC_11	Res	Resolution	8	—	12	Bits	Selectable 8, 10, 12 bit Resolution Ranges
SADC_13	ENOB ^(1,2)	Effective Number of bits	8.6	—	—	Bits	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_15	ENOB ^(1,2)	Effective Number of bits	8.5	—	—	Bits	AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_19	INL	Integral Nonlinearity	-7.4	—	7.3	LSB	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_21	INL	Integral Nonlinearity	-8.7	—	8.9	LSB	AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_25	DNL	Differential Nonlinearity	-0.99	—	1.4	LSB	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_27	DNL	Differential Nonlinearity	-0.99	—	2.1	LSB	AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_31	GERR	Gain Error	-24	—	14	%	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_33	GERR	Gain Error	-37	—	18	%	AVDD = 3.3V VREF=VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_37	EOFF	Offset Error	-42	—	43	mV	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_39	EOFF	Offset Error	-41	—	60	mV	AVDD = 3.3V VREF=VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_43	TUE	Total Unadjusted Error	2.9	—	27	LSB	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_45	TUE	Total Unadjusted Error	4.3	—	47	LSB	AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SINGLE ENDED MODE ADC Dynamic Performance ^(1,2,3)
SADC_49	SINAD	Signal to Noise and Distortion	53.6	—	—	dB	AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_50	SINAD	Signal to Noise and Distortion	52.8	—	—		AVDD = 3.3V VREF=VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_51	SNR	Signal to Noise ratio	55.3	—	—		AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_52	SNR	Signal to Noise ratio	54.2	—	—		AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_53	SFDR	Spurious Free Dynamic Range	57.6	—	—		AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_54	SFDR	Spurious Free Dynamic Range	57.3	—	—		AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
SADC_55	THD ⁽⁴⁾	Total Harmonic Distortion	—	—	-56.1		AVDD = 3.3V VREF = AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.SAMPLEN = 3
SADC_56	THD ⁽⁴⁾	Total Harmonic Distortion	—	—	-55.7		AVDD = 3.3V VREF = VREFA/B = 2.7V (REFCTRL.REFSEL= 0x3 or 0x4) SAMPCTRL.SAMPLEN = 3
Note: Characterized with an analog input sine wave = (F_TP(max) / 100). Example: F_TP(max) = 1MSPS/100 = 10 kHz sine wave. Sine wave peak amplitude = 96% ADC Full Scale amplitude input with 12bit resolution. Spec values collected under the following additional conditions: All registers at reset default value unless otherwise stated. 12bit resolution mode Value taken over 7 harmonics.

Table 49-27. ADC Differential Mode Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.62V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
DIFFERENTIAL MODE ADC Accuracy ⁽³⁾
DADC_11	Res	Resolution	8	—	12	bits	Selectable 8, 10, 12 bit Resolution Ranges
DADC_13	ENOB^(1,2)	Effective Number of bits	9.7	—	—	bits	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_15	ENOB^(1,2)	Effective Number of bits	9.5	—	—	bits	AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_19	INL	Integral Nonlinearity	-3.5	—	4.1	LSB	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_21	INL	Integral Nonlinearity	-5.4	—	4.8	LSB	AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_25	DNL	Differential Nonlinearity	-0.99	—	1.0	LSB	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_27	DNL	Differential Nonlinearity	-0.99	—	1.8	LSB	AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_31	GERR	Gain Error	-19	—	7	%	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_33	GERR	Gain Error	-14	—	22	%	AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_37	EOFF	Offset Error	-5.6	—	2.1	mV	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_39	EOFF	Offset Error	-4.9	—	2.3	mV	AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_43	TUE	Total Unadjusted Error	2.3	—	8.0	LSB	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL = 0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_45	TUE	Total Unadjusted Error	3.5	—	11	LSB	AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DIFFERENTIAL MODE ADC Dynamic Performance ^(1,2,3)
DADC_49	SINAD	Signal to Noise and Distortion	59.9	—	—	dB	AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL =0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_50	SINAD	Signal to Noise and Distortion	59.2	—	—		AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_51	SNR	Signal to Noise ratio	62.4	—	—		AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL =0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_52	SNR	Signal to Noise ratio	61.4	—	—		AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_53	SFDR	Spurious Free Dynamic Range	61.9	—	—		AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL =0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_54	SFDR	Spurious Free Dynamic Range	63.6	—	—		AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
DADC_55	THD ⁽⁴⁾	Total Harmonic Distortion	—	—	-61.4		AVDD = 3.3V VREF=AVDD (REFCTRL.REFSEL =0x5) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=0
DADC_56	THD ⁽⁴⁾	Total Harmonic Distortion	—	—	-63.5		AVDD = 3.3V VREF=VREFA/B=2.7V (REFCTRL.REFSEL = 0x3 or 0x4) SAMPCTRL.OFFCOMP=1 SAMPCTRL.REFCOMP=1
Note: Characterized with an analog input sine wave = (F_TP(max) / 100). Example: F_TP(max)=1MSPS/100 = 10kHz sine wave. Sine wave peak amplitude = 96% ADC Full Scale amplitude input with 12bit resolution. Spec values collected under the following additional conditions: All registers at reset default value unless otherwise stated 12bit resolution mode Value taken over 7 harmonics.

Table 49-28. ADC Conversion Electrical Requirements
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.62V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
ADC Clock Requirements
ADC_57	TAD	ADC Clock Period	62.5	—	6250	ns	—
ADC_58	f_{GCLK_ADC}	ADC Module GCLK max input freq	—	—	FCLK_51	MHz	FCLK_51: Refer to Maximum Clock Frequencies Electrical Specifications
ADC Single-Ended Throughput Rates
ADC_59	F_TP (Single-Ended Mode) ⁽¹⁾	Throughput Rate (Single-Ended)	—	—	1.231	MSPS	12-bit resolution, Rsource ≤298 Ω, SAMPCTRL.OFFCOMP=0 SAMPCTRL.SAMPLEN=0
			—	—	1.333		10-bit resolution, Rsource ≤633 Ω, SAMPCTRL.OFFCOMP=0 SAMPCTRL.SAMPLEN=0
			—	—	1.6		8-bit resolution, Rsource ≤1,103 Ω, SAMPCTRL.OFFCOMP=0 SAMPCTRL.SAMPLEN=0
			—	—	1	MSPS	12-bit resolution, Rsource ≤6,335Ω SAMPCTRL.OFFCOMP=1 SAMPCTRL.SAMPLEN=n/a
			—	—	1.067		10-bit resolution, Rsource ≤7,677 Ω SAMPCTRL.OFFCOMP=1 SAMPCTRL.SAMPLEN=n/a
			—	—	1.231		8-bit resolution, Rsource ≤9,556 Ω SAMPCTRL.OFFCOMP=1 SAMPCTRL.SAMPLEN=n/a
ADC Differential Mode Throughput Rates
ADC_61	F_TP (Differential Mode) ⁽¹⁾	Throughput Rate (Differential Mode)	—	—	1.231	MSPS	12-bit resolution, Rsource ≤298 Ω, SAMPCTRL.OFFCOMP=0 SAMPCTRL.SAMPLEN=0
			—	—	1.455		10-bit resolution, Rsource ≤633 Ω, SAMPCTRL.OFFCOMP=0 SAMPCTRL.SAMPLEN=0
			—	—	1.778		8-bit resolution, Rsource ≤1,103 Ω, SAMPCTRL.OFFCOMP=0 SAMPCTRL.SAMPLEN=0
			—	—	1	MSPS	12-bit resolution, Rsource ≤6,335Ω SAMPCTRL.OFFCOMP=1 SAMPCTRL.SAMPLEN=n/a
			—	—	1.143		10-bit resolution, Rsource ≤7,667 Ω SAMPCTRL.OFFCOMP=1 SAMPCTRL.SAMPLEN=n/a
			—	—	1.333		8-bit resolution, Rsource ≤9,556 Ω SAMPCTRL.OFFCOMP=1 SAMPCTRL.SAMPLEN=n/a
Note: ADC Throughput Rate F_TP = ((1 / ((TSAMP + TCNV) * TAD)) / (# of user analog inputs in use on specific target ADC module)). Specification values assume only one AINx channel in use

Table 49-29. ADC Conversion Electrical Requirements (continued)
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.62V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
ADC_63	T_SAMP ^(1,2)	ADC Sample Time	1	—	—	TAD	12-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 298 Ω
							10-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 633 Ω
							8-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 1,103 Ω
			2	—	—		12-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 2,310 Ω
							10-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 2,981 Ω
							8-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 3,921 Ω
			3	—	—		12-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 4,323 Ω
							10-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 5,329 Ω
							8-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 6,738 Ω
			4	—	—		12-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 6,335 Ω
							10-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 7,678 Ω
							8-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 9,556 Ω
			5	—	—		12-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 8,348 Ω
							10-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 10,026 Ω
							8-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 12,374 Ω
ADC_63	T_SAMP ^(1,2)	ADC Sample Time	6	—	—	TAD	12-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 10,361 Ω
							10-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 12,374 Ω
							8-bit resolution, TAD(min), Ext Analog Input Rsource ≤ 15,192 Ω
			3000	—	—	ns	With DAC as input
			10000	—	—	ns	With Internal BANDGAP as input
ADC_65	T_CNV	Conversion Time (Single-Ended Mode)	12			TAD	12-bit resolution
			11				10-bit resolution
			9				8-bit resolution
ADC_67		Conversion Time (Differential Mode)	12			TAD	12-bit resolution
			10				10-bit resolution
			8				8-bit resolution
ADC_69	C_SAMPLE	ADC Internal Sample Cap	—	—	3.2	pF	—
ADC_71	R_SAMPLE	ADC Internal impedance	—	—	1715	Ω	—
Note: When SAMPCTRL.OFFCOMP = 0: T_SAMP = (((R_SAMPLE + R_SOURCE) * C_SAMPLE * (#Bits Resolution+2) * ln(2)) / TAD) +1 rounded down to nearest whole integer Use the above formula for R_SOURCE values exceeding TSAMP = 6. SAMPCTRL.SAMPLEN = (T_SAMP / TAD - 1) When SAMPCTRL.OFFCOMP=1: T_SAMP = 4 (Forced by ADC Hardware) SAMPCTRL.SAMPLEN = (n/a, Ignored by ADC Hardware)