VREF

Table 1. VREF Specifications
Symbol Description Min. Typ.✝ Max. Unit Conditions
VVREF_1V024(1) Internal Voltage Reference 1.024V -4 4 % VDD ≥ 2.5V, -40°C ≤ TA ≤ +85°C
VVREF_2V048(1) Internal Voltage Reference 2.048V -4 4 % VDD ≥ 2.5V, -40°C ≤ TA ≤ +85°C
VVREF_4V096(1) Internal Voltage Reference 4.096V -4 4 % VDD ≥ 4.55V, -40°C ≤ TA ≤ +85°C
VVREF_2V500(1) Internal Voltage Reference 2.5V -4 4 % VDD ≥ 2.7V, -40°C ≤ TA ≤ +85°C
VVREFA VREFA input pin voltage 1.8 VDD V VDD < 2.7V
1.024 VDD V VDD ≥ 2.7V
tINTREF * Delay for changing voltage reference 2 μs  
tVREF_ST * VREF start-up time 10 μs CLKCTRL.MCLKCTRLA = 0x00 or 0x03
200 μs CLKCTRL.MCLKCTRLA = 0x01 or 0x02

Data in the “Typ.” column is at TA = 25°C and VDD = 3.0V unless otherwise specified. These parameters are not tested and are for design guidance only.

* These parameters are characterized but not tested in production.

Note:
  1. 1.The VVREF_xVxxx symbol refers to the respective values of the REFSEL bit fields in the VREF.ADC0REF, VREF.DAC0REF, and VREF.ACREF registers.