43.17 ADC Electrical Specifications

Table 43-21. ADC AC Electrical Specifications
AC Characteristics			Standard Operating Conditions: V_DD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temp -40°C ≤ T_A ≤ +125°C for Extended Temp
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
Device Supply
ADC_1	AV_DD	ADC module supply	AV_DD(min)	—	AV_DD(max)	V	—
Reference Inputs
ADC_2	V_REF	Absolute reference voltage (V_REFH-V_REFL)	AV_SS-0.3	—	AV_DD+0.3	V	—
ADC_3	V_REFH	Reference voltage high (external reference buffers)	AV_SS+1.8	—	AV_DD	V	—
ADC_4	V_REFL	Reference voltage low (external reference buffers)	AV_SS	—	AV_DD-1.8	V	—
ADC_4a	R_REF	Suggested V_REF impedance	—	—	25	Ω	Resistance from source to the V_REFP/V_REFM input, including RSource, PCB trace, pads and on-chip routing
ADC_4b	V_CM	Analog input Common mode voltage	AV_SS + V_REF/2	—	AV_DD - V_REF/2	V	—
ADC_4c	V_DIFF	Differential analog input voltage (seldiff = 1) (VINP - VINN)	2*(V_REFH - V_REFL)			V	—
ADC_4d	VSING	Single-ended analog input voltage (seldiff = 0) (VINP - VINN)	V_REFL	—	V_REFH	—	—
ADC_4f	RIN_SYS	External input resistance to meet the maximum speed	—	—	125	Ω	Resistance from VINP/VINM to signal source. Include RSource + RPad + RPCB + Rroute
ADC_4g	RSRC	Maximum source impedance to meet 1 MSPS at 12-bit	—	—	1400	Ω	—
Analog Input Range
ADC_7	A_FS	Full-scale analog input signal range (Single-ended)	AV_SS	—	V_REF	V	V_REF = AV_DD(max)
ADC_11	T_SETTLING	ADC stabilization time	—	10	—	µs	—

Table 43-22. ADC Single-Ended Mode AC Electrical Specifications
AC Characteristics			Standard Operating Conditions: V_DD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temp -40°C ≤ T_A ≤ +125°C for Extended Temp
Param. No.	Symbol	Characteristics	Min.	Typical	Max.	Units	Conditions
Single-Ended Mode ADC Accuracy
SADC_11	Res	Resolution	6	—	12	bits	Selectable 6, 8, 10, 12 bit resolution ranges
SADC_13	ENOB⁽³⁾	Effective number of bits	11	11.07	11.14	bits	1 Msps, SAMC = 1, Internal V_REF, V_DDANA = V_DDIO = 3.3V
SADC_19	INL⁽³⁾	Integral non linearity	-1.7	-1.5/1	1	LSB	1 Msps, SAMC = 1, Internal V_REF, V_DDANA = V_DDIO = 3.3V
SADC_25	DNL⁽³⁾	Differential non linearity	-1	-1.5/1	1.8	LSB	1 Msps, SAMC = 1, Internal V_REF, V_DDANA = V_DDIO = 3.3V
SADC_31	GERR⁽³⁾	Gain error	-0.27	0.26	0.43	LSB	1 Msps, SAMC = 1, Internal V_REF, V_DDANA = V_DDIO = 3.3V
SADC_37	EOFF⁽³⁾	Offset error	-0.54	-0.35	0.47	LSB	1 Msps, SAMC = 1, Internal V_REF, V_DDANA = V_DDIO = 3.3V
Single-Ended Mode ADC Dynamic Performance
SADC_49	SINAD^(1,2,3)	Signal to noise and distortion	68.06	68.44	68.88	dB	V_REF = V_DDANA = V_DDIO = 3.3V at 12-bit resolution, 1 Msps, SAMC = 1
SADC_51	SNR^(1,2,3)	Signal to noise ratio	68.46	68.05	69.02
SADC_53	SFDR^(1,2,3)	Spurious free dynamic range	79.83	83.90	86.21
SADC_55	THD^(1,2,3)	Total harmonic distortion	-86.88	-82.76	-77.77
Note: Characterized with an analog input sine wave = (FTP(max)/400). Example: FTP(max) = 1 Msps/400 = 2.5 kHz sine wave. Sine wave peak amplitude = 95% ADC_ Full Scale amplitude input with 12-bit resolution. Spec values collected under the following additional conditions: 12-bit Resolution mode. All registers are at their Reset default values unless otherwise mentioned. The user must do the ADC measurements with a 3.3V V_REF voltage. Value taken over 7 harmonics.

Table 43-23. ADC Conversion AC Electrical Requirements
AC Characteristics			Standard Operating Conditions: V_DD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temp -40°C ≤ T_A ≤ +125°C for Extended Temp
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
ADC_ Clock Requirements
ADC_57	TAD	ADC clock period	31.25	—	125	ns	V_REF = V_DDANA = 3.3V
ADC Single-Ended Throughput Rates
ADC_59	FTPR (Single-ended mode)	Throughput rate (Single-ended)	0.01	—	1	Msps	12-bit resolution, DIV_SHR = 2

Table 43-24. ADC Sample AC Electrical Requirements
AC Characteristics			Standard Operating Conditions: V_DD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ T_A ≤ +85°C for Industrial Temp -40°C ≤ T_A ≤ +125°C for Extended Temp
Param. No.	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
ADC_63	TSAMP	ADC sample time⁽¹⁾	2	—	—	TAD	12-bit TAD(min), Ext Analog Input Rsource ≤ 147Ω
							10-bit TAD(min), Ext Analog Input Rsource ≤ 504Ω
							8-bit TAD(min), Ext Analog Input Rsource ≤ 1,000Ω
			2	—	—		12-bit TAD(min), Ext Analog Input Rsource ≤ 2,272Ω
							10-bit TAD(min), Ext Analog Input Rsource ≤ 3,008Ω
							8-bit TAD(min), Ext Analog Input Rsource ≤ 4,000Ω
			3	—	—		12-bit TAD(min), Ext Analog Input Rsource ≤ 4,416Ω
							10-bit TAD(min), Ext Analog Input Rsource ≤ 5,504Ω
							8-bit TAD(min), Ext Analog Input Rsource ≤ 6,976Ω
			4	—	—		12-bit TAD(min), Ext Analog Input Rsource ≤ 6,560Ω
							10-bit TAD(min), Ext Analog Input Rsource ≤ 8,000Ω
							8-bit TAD(min), Ext Analog Input Rsource ≤ 9,984Ω
			5	—	—		12-bit TAD(min), Ext Analog Input Rsource ≤ 8,704Ω
							10-bit TAD(min), Ext Analog Input Rsource ≤ 10,496Ω
							8-bit TAD(min), Ext Analog Input Rsource ≤ 12,992Ω
			6	—	—		12-bit TAD(min), Ext Analog Input Rsource ≤ 10,880Ω
							10-bit TAD(min), Ext Analog Input Rsource ≤ 12,992Ω
							8-bit TAD(min), Ext Analog Input Rsource ≤ 16,000Ω
			—	—	—	ns	With DAC as input
			—	—	—	ns	With temperature sensor as input
ADC_65	TCNV	Conversion time⁽¹⁾ (Single-Ended mode)	12.5			TAD	12-bit resolution
			10.5				10-bit resolution
			8.5				8-bit resolution
			6.5				6-bit resolution
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.