38.15 ADC

Operating conditions:
  • VDD = 2.7 to 5.5V
  • Temperature = -40°C to 125°C
  • DUTYCYC = 25%
  • CLKADC = 13 * fADC
  • SAMPCAP is 10 pF for 0.55V reference, while it is set to 5 pF for VREF≥1.1V
  • Applies for all allowed combinations of VREF selections and sample rates unless otherwise noted
Table 38-23. Power Supply, Reference, and Input Range
Symbol Description Conditions Min. Typ. Max. Unit
VDD Supply voltage 2.7 - 5.5 V
VREF Reference voltage REFSEL = Internal reference 0.55 - VDD-0.4 V
REFSEL = External reference 1.1 - VDD
REFSEL = VDD 2.7 - 5.5
CIN Input capacitance SAMPCAP=5 pF - 5 - pF
SAMPCAP=10 pF - 10 -
VIN Input voltage range 0 - VREF V
IBAND Input bandwidth 1.1V≤VREF - - 57.5 kHz
Table 38-24. Clock and Timing Characteristics
Symbol Description Conditions Min. Typ. Max. Unit
fADC Sample rate 1.1V≤VREF 15 - 115 ksps
1.1V≤VREF (8-bit resolution) 15 - 150
VREF=0.55V (10 bits) 7.5 - 20
CLKADC Clock frequency VREF=0.55V (10 bits) 100 - 260 kHz
1.1V≤VREF (10 bits) 200 - 1500
1.1V≤VREF (8-bit resolution) 200 - 2000
Ts Sampling time 2 2 33 CLKADC cycles
TCONV Conversion time (latency) Sampling time = 2 CLKADC 8.7 - 50 µs
TSTART Start-up time Internal VREF - 22 - µs
Table 38-25. Accuracy Characteristics Internal Reference(2)
Symbol Description Conditions Min. Typ. Max. Unit
Res Resolution - 10 - bit
INL Integral Non-linearity REFSEL = INTERNAL

VREF=0.55V		 fADC=7.7 ksps - 1.0 3.0 LSB
REFSEL = INTERNAL or VDD fADC=15 ksps - 1.0 3.0
REFSEL = INTERNAL or VDD

1.1V≤VREF		 fADC=77 ksps - 1.0 3.0
fADC=115 ksps - 1.2 3.0
DNL(1) Differential Non-linearity REFSEL = INTERNAL

VREF = 0.55V		 fADC=7.7 ksps - 0.6 1.3 LSB
REFSEL = INTERNAL

VREF = 1.1V		 fADC=15 ksps - 0.4 1.2
REFSEL = INTERNAL or VDD

1.5V≤VREF		 fADC=15 ksps - 0.4 1.0
REFSEL = INTERNAL or VDD

1.1V≤VREF		 fADC=77 ksps - 0.4 1.0
REFSEL = INTERNAL

1.1V≤VREF		 fADC=115 ksps - 0.5 1.6
REFSEL = VDD

1.8V≤VREF		 fADC=115 ksps - 0.9 2.0
EABS Absolute accuracy REFSEL = INTERNAL

VREF = 1.1V		 T=[0-105]°C

VDD = [2.7V-3.6V]		 - 3 30 LSB
VDD = [2.7V-3.6V] - 3 40
REFSEL = VDD - 2 5
REFSEL = INTERNAL - - 65
EGAIN Gain error REFSEL = INTERNAL

VREF = 1.1V		 T=[0-105]°C

VDD = [2.7V-3.6V]		 -25 3 25 LSB
VDD = [2.7V-3.6V] -35 3 35
REFSEL = VDD -1 2 4
REFSEL = INTERNAL -60 - 60
EOFF Offset error REFSEL = INTERNAL

VREF = 0.55V		 -5 -0.5 2 LSB
REFSEL = INTERNAL

1.1V ≤ VREF		 -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 fADC must fulfill the specification in Clock and Timing Characteristics, and Power supply, Reference, and Input Range tables.
Operating conditions:
  • VDD = 2.7 to 5.5V
  • Temperature = -40°C to 125°C
  • DUTYCYC = 25%
  • CLKADC = 13 * fADC
  • SAMPCAP is 5 pF
The accuracy characteristics numbers are based on characterization of the following input reference levels and VDD ranges
  • VREF = 1.8V, VDD = 2.7 to 5.5V
  • VREF = 2.6V, VDD = 2.7 to 5.5V
  • VREF = 4.096V, VDD = 4.5 to 5.5V
  • VREF = 4.3V, VDD = 4.5 to 5.5V
Table 38-26. Accuracy Characteristics External Reference(2)
Symbol Description Conditions Min. Typ. Max. Unit
Res Resolution - 10 - bit
INL Integral Non-linearity fADC=15 ksps - 0.9 3.5 LSB
fADC=77 ksps - 0.9 3.5
fADC=115 ksps - 1.2 3.5
DNL(1) Differential Non-linearity fADC=15 ksps - 0.2 1.0 LSB
fADC=77 ksps - 0.4 1.0
fADC=115 ksps - 0.8 2.0
EABS Absolute accuracy fADC=15 ksps - 2 5 LSB
fADC=77 ksps - 2 5
fADC=115 ksps - 2 5
EGAIN Gain error fADC=15 ksps -1 2 4 LSB
fADC=77 ksps -1 2 4
fADC=115 ksps -1 2 4
EOFF Offset error -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.