55.21 ADC Electrical Specifications

Table 55-25. ADC Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temperature
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	V_REF⁽¹⁾	ADC Reference Voltage	The greater of AVDD(min) or 2.4V	—	AVDD-0.4	V	External Reference VREF ≤ AVDD -0.4V
ADC_3	V_REF⁽¹⁾	ADC Reference Voltage	The greater of AVDD(min) or 2.4V	—	AVDD	V	Internal Reference VREF ≤ AVDD
Analog Input Range
ADC_7	A_FS	Full-Scale Analog Input Signal Range	AVSS	—	VREF	V	Single-Ended
ADC_9	A_FS	Full-Scale Analog Input Signal Range	-VREF	—	+VREF	V	Differential
ADC10	V_CMIN	Input common mode voltage	AVSS	VREF/2	AVDD	—	CTRLA.R2R =1
ADC10	V_CMIN	Input common mode voltage	Note ⁽²⁾	VREF/2	Note ⁽²⁾	—	CTRLA.R2R =0
ADC_11	T_SETTLING	ADC Stabilization Time	—	10	—	µs	CTRLA.ENABLE=1 or CTRLA.ONDEMAND=1
Note: ADC functional device operation with external V_REF<2.4V is functional, but not characterized. ADC will function, but with degraded accuracy of approximately ~((0.06 * 2n) / V_REF) LSB’s over full scale range, where "n"= # bits. ADC accuracy is limited by internal V_REF accuracy + drift, MCU generated noise plus users application noise/accuracy on AVDD, AVSS. Limit the input common mode voltage using the following equations (where, V_CMIN is the input channel common mode voltage): When CTRLA.R2R = 0: V_CMIN < 0.75V_REF V_CMIN > Maximum of (0, V_REF-AVDD-0.7, 1.25V_REF-AVDD) These values are based on simulation. They are not covered by production test limits or characterization.

Table 55-26. ADC Single Ended Mode Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temperature
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
SINGLE ENDED MODE ADC Accuracy ⁽⁴⁾
SADC_11	Res	Resolution	8	—	12	bits	Selectable 8, 10, 12 bit Resolution Ranges
SADC_13	ENOB ^(1,2)	Effective Number of bits	8.9	—	—	bits	1Msps, Internal VREF= AVDD=VDD=3.3V
SADC_15	ENOB ^(1,2)	Effective Number of bits	8.9	—	—	bits	1Msps, External VREF=2.4V, AVDD=VDD=3.3V
SADC_19	INL	Integral Nonlinearity	-3.2	—	3.2	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V
SADC_21	INL	Integral Nonlinearity	-3.5	—	3.5	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V
SADC_25	DNL	Differential Nonlinearity	-1	—	1	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V
SADC_27	DNL	Differential Nonlinearity	-1	—	1.1	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V
SADC_31	GERR	Gain Error	-12.3	—	12.3	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, REFCTRL.REFCOMP=1
SADC_31	GERR	Gain Error	-8.2	—	12.3	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, REFCTRL.REFCOMP=1
SADC_37	EOFF	Offset Error	-22.4	—	8.7	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, SAMPCTRL.OFFCOMP=1
SADC_37	EOFF	Offset Error	-31.8	—	22.2	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, SAMPCTRL.OFFCOMP=1
SADC_43	TUE	Total Unadjusted Error	-18.3	—	18.3	LSB	1Msps, Internal VREF=AVDD=VDD=3.3v, REFCTRL.REFCOMP=1, SAMPCTRL.OFFCOMP=1
SADC_47	TUE	Total Unadjusted Error	-19.1	—	19.1	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, REFCTRL.REFCOMP=1, SAMPCTRL.OFFCOMP=1
SINGLE ENDED MODE ADC Dynamic Performance ⁽⁴⁾
SADC_49	SINAD ^(1,2)	Signal to Noise and Distortion	55.7	—	—	dB	VREF=AVDD=VDD=3.3V at 12bit max sampling rate
SADC_51	SNR ^(1,2)	Signal to Noise ratio	54.7	—	—
SADC_53	SFDR ^(1,2)	Spurious Free Dynamic Range	67.9	—	—
SADC_55	THD ^(1,2,3)	Total Harmonic Distortion	—	—	-65.8
SADC_57	Nrms	Noise RMS	—	—	2.2	LSB	VREF = AVDD = VDD = 3.3V, Constant Input Voltage
SADC_57	Nrms	Noise RMS	—	—	3.6	LSB	External VREF = 2.4V, AVDD = VDD = 3.3V, Constant Input Voltage
Note: Characterized with an analog input sine wave = (FTP(max) / 100). Example: FTP(max)=1Msps/100 = 10kHz sine wave. Sinewave peak amplitude = 96% ADC_ Full Scale amplitude input with 12bit resolution. Value taken over 7 harmonics. ADC is configured in 12bits mode, All registers are at the reset default value unless otherwise stated.

Table 55-27. ADC Differential Mode Electrical Specifications
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated) Operating temperature : -40°C ≤ T_A ≤ +85°C for Industrial Temperature
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
DIFFERENTIAL MODE ADC Accuracy ⁽⁴⁾
DADC_11	Res	Resolution	8	—	12	bits	Selectable 8, 10, 12 bit Resolution Ranges
DADC_13	ENOB^(1,2)	Effective Number of bits	10.5	—	—	bits	1Msps, Internal VREF=AVDD=VDD=3.3V
DADC_15	ENOB^(1,2)	Effective Number of bits	10.5	—	—	bits	1Msps, External VREF=2.4V, AVDD=VDD=3.3V
DADC_19	INL	Integral Nonlinearity	-1.5	—	1.5	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V
DADC_21	INL	Integral Nonlinearity	-1.5	—	1.5	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V
DADC_25	DNL	Differential Nonlinearity	-1	—	1	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V
DADC_27	DNL	Differential Nonlinearity	-1	—	1	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V
DADC_31	GERR	Gain Error	-7.4	—	6.6	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, REFCTRL.REFCOMP=1
			-3.7	—	7.4	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, REFCTRL.REFCOMP=1
			-8.2	—	6.6	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, REFCTRL.REFCOMP=0
			-30.4	—	27.1	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, REFCTRL.REFCOMP=0
DADC_37	EOFF	Offset Error	-3.6	—	3.0	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, SAMPCTRL.OFFCOMP=1
			-4.5	—	3.6	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, SAMPCTRL.OFFCOMP=1
			-11.8	—	12.3	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, SAMPCTRL.OFFCOMP=0
			-16.9	—	16.8	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, SAMPCTRL.OFFCOMP=0
DADC_43	TUE	Total Unadjusted Error	-5.2	—	5.2	LSB	1Msps, Internal VREF=AVDD=VDD=3.3V, REFCTRL.REFCOMP=1, SAMPCTRL.OFFCOMP=1
DADC_45	TUE	Total Unadjusted Error	-5.6	—	5.6	LSB	1Msps, External VREF=2.4V, AVDD=VDD=3.3V, REFCTRL.REFCOMP=1, SAMPCTRL.OFFCOMP=1
DIFFERENTIAL MODE ADC Dynamic Performance ⁽⁴⁾
DADC_49	SINAD ^(1,2)	Signal to Noise and Distortion	65.3	—	—	dB	VREF=AVDD=VDD=3.3V at 12bit max sampling rate
DADC_51	SNR ^(1,2)	Signal to Noise ratio	64.7	—	—
DADC_53	SFDR ^(1,2)	Spurious Free Dynamic Range	76.6	—	—
DADC_55	THD ^(1,2,3)	Total Harmonic Distortion	—	—	-78.6
DADC_57	Nrms	Noise RMS	—	—	3.1	LSB	VREF = AVDD = VDD = 3.3V, Constant Input Voltage
DADC_57	Nrms	Noise RMS	—	—	4.1	LSB	External VREF = 2.4V, AVDD = VDD = 3.3V, Constant Input Voltage
Note: Characterized with an analog input sine wave = (FTP(max) / 100). Example: FTP(max)=1Msps/100 = 10kHz sine wave. Sinewave peak amplitude = 96% ADC_ Full Scale amplitude input with 12bit resolution. Value taken over 7 harmonics. ADC is configured in 12bits mode, All registers are at the reset default value unless otherwise stated.

Table 55-28. ADC Conversion Electrical Requirements ⁽²⁾
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temperature
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
ADC_ Clock Requirements
ADC_57	TAD	ADC Clock Period	62.5	—	6250	ns	—
ADC_58	fGCLK_ADCx	ADCx Module GCLK max input freq	—	—	FCLK_51	MHz	FCLK_51: Refer to Maximum Clock Frequencies Electrical Specifications
ADC Single-Ended Throughput Rates
ADC_59	FTPR ⁽¹⁾(Single-Ended Mode)	Throughput Rate (Single-Ended)	12.31	—	1231	ksps	12-bit resolution, Rsource ≤ 147 Ω, SAMPCTRL.OFFCOMP=0, SAMPCTRL.SAMPLEN=0
			13.33	—	1333		10-bit resolution, Rsource ≤ 504 Ω, SAMPCTRL.OFFCOMP=0, SAMPCTRL.SAMPLEN=0
			16	—	1600		8-bit resolution, Rsource ≤ 1,000 Ω, SAMPCTRL.OFFCOMP=0, SAMPCTRL.SAMPLEN=0
			10	—	1000	ksps	12-bit resolution, Rsource ≤ 6,560 Ω SAMPCTRL.OFFCOMP=1, SAMPCTRL.SAMPLEN=n/a
			10.67	—	1067		10-bit resolution, Rsource ≤ 8,000 Ω SAMPCTRL.OFFCOMP=1, SAMPCTRL.SAMPLEN=n/a
			12.31	—	1231		8-bit resolution, Rsource ≤ 9,984 Ω SAMPCTRL.OFFCOMP=1, SAMPCTRL.SAMPLEN=n/a
ADC Differential Mode Throughput Rates
ADC_61	FTPR ⁽¹⁾ (Differential Mode)	Throughput Rate (Differential Mode)	12.31	—	1231	ksps	12-bit resolution, Rsource ≤ 147 Ω, SAMPCTRL.OFFCOMP=0, SAMPCTRL.SAMPLEN=0
			14.55	—	1455		10-bit resolution, Rsource ≤ 504 Ω, SAMPCTRL.OFFCOMP=0, SAMPCTRL.SAMPLEN=0
			17.78	—	1778		8-bit resolution, Rsource ≤ 1,000 Ω, SAMPCTRL.OFFCOMP=0, SAMPCTRL.SAMPLEN=0
			10	—	1000	ksps	12-bit resolution, Rsource ≤ 6,560 Ω SAMPCTRL.OFFCOMP=1, SAMPCTRL.SAMPLEN=n/a
			11.43	—	1143		10-bit resolution, Rsource ≤ 8,000 Ω SAMPCTRL.OFFCOMP=1, SAMPCTRL.SAMPLEN=n/a
			13.33	—	1333		8-bit resolution, Rsource ≤ 9,984 Ω SAMPCTRL.OFFCOMP=1, SAMPCTRL.SAMPLEN=n/a
Note: ADC Throughput Rate FTP = ((1 / ((TSAMP + TCNV) * TAD)) / (# of user active analog inputs in use on specific target ADC module)). Note: Specification values assume only one AINx channel in use. These values are based on simulation, and not covered by production test limits or characterization.

Table 55-29. ADC Sample Electrical Requirements ⁽³⁾
AC CHARACTERISTICS			Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated) Operating temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temperature
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
ADC_63	TSAMP	ADC Sample Time^(1,2,4)	1	—	—	TAD	12 bit TAD(min), Ext Analog Input Rsource ≤ 147 Ω
							10 bit TAD(min), Ext Analog Input Rsource ≤ 504 Ω
							8 bit TAD(min), Ext Analog Input Rsource ≤ 1,000 Ω
			2	—	—		12 bit TAD(min), Ext Analog Input Rsource ≤ 2,272 Ω
							10 bit TAD(min), Ext Analog Input Rsource ≤ 3,008 Ω
							8 bit TAD(min), Ext Analog Input Rsource ≤ 4,000 Ω
			3	—	—		12 bit TAD(min), Ext Analog Input Rsource ≤ 4,416 Ω
							10 bit TAD(min), Ext Analog Input Rsource ≤ 5,504 Ω
							8 bit TAD(min), Ext Analog Input Rsource ≤ 6,976 Ω
			4	—	—		12 bit TAD(min), Ext Analog Input Rsource ≤ 6,560 Ω
							10 bit TAD(min), Ext Analog Input Rsource ≤ 8,000 Ω
							8 bit TAD(min), Ext Analog Input Rsource ≤ 9,984 Ω
			5	—	—		12 bit TAD(min), Ext Analog Input Rsource ≤ 8,704 Ω
							10 bit TAD(min), Ext Analog Input Rsource ≤ 10,496 Ω
							8 bit TAD(min), Ext Analog Input Rsource ≤ 12,992 Ω
			6	—	—		12 bit TAD(min), Ext Analog Input Rsource ≤ 10,880 Ω
							10 bit TAD(min), Ext Analog Input Rsource ≤ 12,992 Ω
							8 bit TAD(min), Ext Analog Input Rsource ≤ 16,000 Ω
			DAC_15, DAC_17	—	—	ns	With DAC as input DAC_15, DAC_17: Refer to DAC Module Electrical Specifications
ADC_65	TCNV	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	CSAMPLE	ADC Internal Sample Cap	—	—	3	pF	—
ADC_71	RSAMPLE	ADC Internal impedance	—	—	2000	Ω	—
Note: When SAMPCTRL.OFFCOMP = 0: TSAMP = (((RSAMPLE + RSOURCE) * CSAMPLE * (#Bits Resolution + 2) * ln(2)) / TAD)+1 rounded down to nearest whole integer User SAMPCTRL.SAMPLEN = (TSAMP - 1) When SAMPCTRL.OFFCOMP=1: TSAMP = 4 (Forced by HDW) User SAMPCTRL.SAMPLEN = (n/a, Ignored by HDW) These values are based on simulation and are not covered by production test limits or characterization. TSAMP ≥ (INT[((RSAMPLE + RSOURCE) * CSAMPLE * (#Bits Resolution+2) * ln(2)) / TAD]+1).

PIC32CX SG41/SG60/SG61 Family Data Sheet

55.21 ADC Electrical Specifications