36.16 ADC

Table 36-22. Power Supply, Reference and Input Range
Operating conditions: V_DD = 3.0V T_A = 25°C Applies for all allowed combinations of VREF selections and sample rates unless otherwise specified Characteristics are identical with and without PGA enabled unless otherwise specified
Symbol	Description	Min.	Typ.✝	Max.	Unit	Conditions
V_DD	Supply voltage	1.8	—	5.5	V
V_REF	Reference voltage	1.024	—	V_DD	V
C_IN	Input capacitance	—	2.5	—	pF	PGA disabled
C_IN	Input capacitance	—	7	—	pF	PGA enabled
R_IN	Input resistance	—	3	—	kΩ	PGA disabled
R_IN	Input resistance	—	2.5	—	kΩ	PGA enabled
V_IN	Input voltage range	0	—	V_REF	V	Single-Ended mode
V_IN	Input voltage range	-0.1	—	V_DD + 0.1	V	Differential mode
✝ Unless otherwise specified, data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V . These parameters are not tested and are for design guidance only.

Table 36-23. Clock and Timing Characteristics
Operating conditions: V_DD = 3.0V T_A = 25°C Applies for all allowed combinations of VREF selections and sample rates unless otherwise specified Characteristics are identical with and without PGA enabled unless otherwise specified
Symbol	Description	Min.	Typ.✝	Max.	Unit	Conditions
CLK_ADC	ADC clock frequency	300	—	2000	kHz	REFSEL = Internal Reference
CLK_ADC	ADC clock frequency	300	—	6000	kHz	REFSEL = External Reference REFSEL = V_DD
✝ Unless otherwise specified, data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V . These parameters are not tested and are for design guidance only.

Table 36-24. Accuracy Characteristics
Operating conditions: V_DD = 3.0V V_REF = External 2.048V T_A = 25°C f_{CLK_ADC} = 2.5 MHz Differential mode CPU in Idle sleep mode
Symbol	Description	Min.	Typ.✝	Max.	Unit	Conditions
Res	Resolution	—	—	12	bit
E_INL	Integral nonlinearity⁽¹⁾	-2.3	0.8	+2.3	LSb
E_DNL	Differential nonlinearity⁽¹⁾	-0.9	0.8	+1.6
E_OFF	Offset error	-15	1.5	+15		PGA disabled
E_GAIN	Gain error	—	0.6	—		PGA disabled
E_T	Total unadjusted error	—	5	—		PGA disabled
✝ Unless otherwise specified, data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V . These parameters are not tested and are for design guidance only. Note: Unless indicated otherwise, the linearity characteristics stay identical regardless of whether the PGA is activated.

Table 36-25. PGA Characteristics
Operating conditions: V_DD = 3.0V -40°C ≤ T_A ≤ 125°C
Symbol	Description	Min.	Typ.✝	Max.	Unit	Conditions
N_RMS	Input noise	—	32	—	µV_RMS	PGA Gain = 1V/V
		—	63	—		PGA Gain = 2V/V
		—	125	—		PGA Gain = 4V/V
		—	250	—		PGA Gain = 8V/V
		—	500	—		PGA Gain = 16V/V
E_GAIN	Gain error	—	-0.2	—	%	PGA Gain = 1V/V
		—	-0.2	—		PGA Gain = 2V/V
		—	-0.3	—		PGA Gain = 4V/V
		—	-0.6	—		PGA Gain = 8V/V
		—	-0.8	—		PGA Gain = 16V/V
✝ Data in the “Typ.” column is at T_A = 25°C and V_DD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.