43.9 Internal Voltage Reference Specifications

Table 43-12. Internal Voltage Reference Electrical Specifications
DC CHARACTERISTICS Standard Operating Conditions: VDD and VDDIO 2.7V to 5.5V (unless otherwise stated)

Operating temperature: -40°C ≤ TA ≤ +85°C for Industrial
Param. No. Symbol Characteristics Min. Typical (1) Max. Units Conditions
VR_1 IREF (2,3) Internal Voltage Reference

ADC.REFCTRL.REFSEL = INTREF

DAC.CTRLB.REFSEL = INTREF

SDADC.REFCTRL.REFSEL = INTREF

 3.992 4.096 4.164 V VDDANA(min) ≥ INTERNAL Voltage VREF.SEL = 3
VR_9 ACIREF(4) Internal Voltage Reference Comparator AC.COMPCTRLn.MUXNEG = INTREF 3.992 4.096 4.164 V VREF.SEL = 3
VR_11 1.996 2.048 2.082 V VREF.SEL = 2
VR_13 0.998 1.024 1.041 V VREF.SEL = 0
VR_25 TDRIFT Internal Voltage Reference Temperature Drift -0.019 - 0.006 %/°C Over [-40, +25]°C
-0.002 - 0.009 %/°C Over [+25, +85]°C
VR_27 VDRIFT Internal Voltage Reference Voltage Drift -0.111 - 0.252 %/V Over full operating voltage range
Note:
  1. Typical values at 25°C only.
  2. ADC, DAC, SDADC Internal Voltage Reference voltage 2.4V ≤ IREF ≤ VDDANA.
  3. ADC, DAC, SDADC reference voltages < 2.4V, (i.e. < 500µV/step), is not practical and peripheral performance is not guaranteed.
  4. Comparator Ref voltage cannot exceed (VIN(max)-VIOFF(max)-200mV) ≥ CMP VREF ≥ (VIN(min)+VIOFF(min)+200mV) (i.e. VIN = Parameter CMP_4, VIOFF = Parameter CMP_1).