ADC

Operating conditions:

V_DD = 1.8 to 5.5V
Temperature = -40°C to 125°C
DUTYCYC = 25%
CLK_ADC = 13 * f_ADC
SAMPCAP is 10 pF for 0.55V reference, while it is set to 5 pF for V_REF≥1.1V
Applies for all allowed combinations of V_REF selections and sample rates unless otherwise noted

Table 1. Clock and Timing Characteristics
Symbol	Description	Conditions	Min.	Typ.	Max.	Unit
f_ADC	Sample rate	1.1V≤V_REF	15	-	115	ksps
		1.1V≤V_REF (8-bit resolution)	15	-	150
		V_REF=0.55V (10 bits)	7.5	-	20
CLK_ADC	Clock frequency	V_REF=0.55V (10 bits)	100	-	260	kHz
		1.1V≤V_REF (10 bits)	200	-	1500
		1.1V≤V_REF (8-bit resolution)	200	-	2000
Ts	Sampling time		2	2	33	CLK_ADC cycles
T_CONV	Conversion time (latency)	Sampling time = 2 CLK_ADC	8.7	-	50	µs
T_START	Start-up time	Internal V_REF	-	22	-	µs

Table 2. Accuracy Characteristics Internal Reference⁽²⁾
Symbol	Description	Conditions		Min.	Typ.	Max.	Unit
Res	Resolution			-	10	-	bit
INL	Integral Non-linearity	REFSEL = INTERNAL V_REF=0.55V	f_ADC=7.7 ksps	-	1.0	3.0	LSB
		REFSEL = INTERNAL or VDD	f_ADC=15 ksps	-	1.0	3.0
		REFSEL = INTERNAL or VDD 1.1V≤V_REF	f_ADC=77 ksps	-	1.0	3.0
		REFSEL = INTERNAL or VDD 1.1V≤V_REF	f_ADC=115 ksps	-	1.2	3.0
DNL⁽¹⁾	Differential Non-linearity	REFSEL = INTERNAL V_REF = 0.55V	f_ADC=7.7 ksps	-	0.6	1.3	LSB
		REFSEL = INTERNAL V_REF = 1.1V	f_ADC=15 ksps	-	0.4	1.2
		REFSEL = INTERNAL or VDD 1.5V≤V_REF	f_ADC=15 ksps	-	0.4	1.0
		REFSEL = INTERNAL or VDD 1.1V≤V_REF	f_ADC=77 ksps	-	0.4	1.0
		REFSEL = INTERNAL 1.1V≤V_REF	f_ADC=115 ksps	-	0.5	1.6
		REFSEL = VDD 1.8V≤V_REF	f_ADC=115 ksps	-	0.9	2.0
EABS	Absolute accuracy	REFSEL = INTERNAL V_REF = 1.1V	T=[0-105]°C V_DD = [1.8V-3.6V]	-	3	30	LSB
		REFSEL = INTERNAL V_REF = 1.1V	V_DD = [1.8V-3.6V]	-	3	40
		REFSEL = V_DD		-	2	5
		REFSEL = INTERNAL		-	-	65
EGAIN	Gain error	REFSEL = INTERNAL V_REF = 1.1V	T=[0-105]°C V_DD = [1.8V-3.6V]	-25	3	25	LSB
		REFSEL = INTERNAL V_REF = 1.1V	V_DD = [1.8V-3.6V]	-35	3	35
		REFSEL = V_DD		-1	2	4
		REFSEL = INTERNAL		-60	-	60
EOFF	Offset error	REFSEL = INTERNAL V_REF = 0.55V		-5	-0.5	2	LSB
EOFF	Offset error	REFSEL = INTERNAL 1.1V ≤ V_REF		-4	-0.5	2	LSB

Note:

1.A DNL error of less than or equal to 1 LSB ensures a monotonic transfer function with no missing codes.
2.These values are based on characterization and not covered by production test limits.
3.Reference setting and f_ADC must fulfill the specification in Clock and Timing Characteristics, and Power supply, Reference, and Input Range tables.