46.13 VREF

Table 46-18. V_REF Specifications
Symbol	Description	Min.	Typ. ✝	Max.	Units	Conditions
VDD_{VREF_1V024}	V_DD for 1.024V Internal VREF	2.7		5.5	V
VDD_{VREF_2V048}	V_DD for 2.048V Internal VREF	2.7		5.5	V
VDD_{VREF_4V096}	V_DD for 4.096V Internal VREF	4.55		5.5	V
VDD_{VREF_2V5}	V_DD for 2.5V Internal VREF	2.95		5.5	V
VDD_{VREF_EXT}	V_DD for External VREF	2.7		5.5	V
V_{VREF_EXT} *	External V_REF Input Pin Voltage	1.024		V_DD	V
V_{VREF_1V024}⁽¹⁾	Internal V_REF Accuracy 1.024V	-4		4	%	-40°C ≤ T_A ≤ +85°C
V_{VREF_2V048}⁽¹⁾	Internal V_REF Accuracy 2.048V	-4		4	%	-40°C ≤ T_A ≤ +85°C
V_{VREF_4V096} ⁽¹⁾	Internal V_REF Accuracy 4.096V	-4		4	%	-40°C ≤ T_A ≤ +85°C
V_{VREF_2V500}⁽¹⁾	Internal V_REF Accuracy 2.5V	-4		4	%	-40°C ≤ T_A ≤ +85°C
t_{VREF_ST} *	V_REF start-up time		10		µs	CLKCTRL.MCLKCTRLA = 0x00 or 0x03
t_{VREF_ST} *	V_REF start-up time		200		µs	CLKCTRL.MCLKCTRLA = 0x01 or 0x02
t_INTREF *	V_REF settling time ⁽²⁾		2		µs
✝ 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. * These parameters are characterized but not tested in production. Note: The symbol V_{VREF_xVxxx} refers to the respective values of the REFSEL bit fields in the ADC0.CTRLC, ADC1.CTRLC, VREF.DAC0REF and VREF.ACREF registers. Settling time will be needed after changing the REFSEL setting.