36.16 ADC

Table 36-22. Power Supply, Reference and Input Range
Operating conditions:
  • VDD = 3.0V
  • TA = 25°C
  • Applies for all allowed combinations of VREF selections and sample rates unless otherwise specified
  • Characteristics are identical with and without PGA enabled unless otherwise specified
Symbol Description Min. Typ.✝ Max. Unit Conditions
VDD Supply voltage 1.8 — 5.5 V
VREF Reference voltage 1.024 — VDD V
CIN Input capacitance — 2.5 — pF PGA disabled
— 7 — PGA enabled
RIN Input resistance — 3 — kΩ PGA disabled
— 2.5 — kΩ PGA enabled
VIN Input voltage range 0 — VREF V Single-Ended mode
-0.1 — VDD + 0.1 Differential mode

✝ Unless otherwise specified, data in the “Typ.” column is at TA = 25°C and VDD = 3.0V . These parameters are not tested and are for design guidance only.
Table 36-23. Clock and Timing Characteristics
Operating conditions:
  • VDD = 3.0V
  • TA = 25°C
  • Applies for all allowed combinations of VREF selections and sample rates unless otherwise specified
  • Characteristics are identical with and without PGA enabled unless otherwise specified
Symbol Description Min. Typ.✝ Max. Unit Conditions
CLK_ADC ADC clock frequency 300 — 2000 kHz REFSEL = Internal Reference
300 — 6000

REFSEL = External Reference

REFSEL = VDD

✝ Unless otherwise specified, data in the “Typ.” column is at TA = 25°C and VDD = 3.0V . These parameters are not tested and are for design guidance only.
Table 36-24. Accuracy Characteristics
Operating conditions:
  • VDD = 3.0V
  • VREF = External 2.048V
  • TA = 25°C
  • fCLK_ADC = 2.5 MHz
  • Differential mode
  • CPU in Idle sleep mode
Symbol Description Min. Typ.✝ Max. Unit Conditions
Res Resolution — — 12 bit
EINL Integral nonlinearity(1) -2.3 0.8 +2.3 LSb
EDNL Differential nonlinearity(1) -0.9 0.8 +1.6
EOFF Offset error -15 1.5 +15 PGA disabled
EGAIN Gain error — 0.6 — PGA disabled
ET Total unadjusted error — 5 — PGA disabled

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

Note:
  1. Unless indicated otherwise, the linearity characteristics stay identical regardless of whether the PGA is activated.
Table 36-25. PGA Characteristics
Operating conditions:
  • VDD = 3.0V
  • -40°C ≤ TA ≤ 125°C
Symbol Description Min. Typ.✝ Max. Unit Conditions
NRMS Input noise — 32 — µVRMS PGA Gain = 1V/V
— 63 — PGA Gain = 2V/V
— 125 — PGA Gain = 4V/V
— 250 — PGA Gain = 8V/V
— 500 — PGA Gain = 16V/V
EGAIN Gain error — -0.2 — % PGA Gain = 1V/V
— -0.2 — PGA Gain = 2V/V
— -0.3 — PGA Gain = 4V/V
— -0.6 — PGA Gain = 8V/V
— -0.8 — PGA Gain = 16V/V

✝ 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.