Analog-to-Digital Converter (ADC) Accuracy Specifications(1,2)

Table 1.

Standard Operating Conditions (unless otherwise stated)

VDD = 3.0V, TA = 25°C, TAD = 1 μs, FOSC ≤ 8 MHz, ADCVREF = VDD/VSS, Differential Mode

Param No. Sym. Characteristic Min. Typ. † Max. Units Conditions
AD01 NR Resolution 12 bit  
AD02* EIL Integral Nonlinearity Error -6 ±0.5 +6 LSb ADCREF+ = 3.0V,


AD03* EDL Differential Nonlinearity Error -1 ±0.5 +2.5 LSb ADCREF+ = 3.0V,


AD04* EOFF Offset Error -11.5 ±3 +11.5 LSb ADCREF+ = 3.0V,


AD05* EGN Gain Error -4 ±1 +4 LSb ADCREF+ = 3.0V,


AD06 VADREF ADC Reference Voltage (ADREF+ - ADREF-) 1.8 VDD V  
AD07 VAIN Full-Scale Range VSS ADREF+ V  
AD08 ZAIN Recommended Impedance of Analog Voltage Source 1  
AD09 RVREF ADC Voltage Reference Ladder Impedance 50 (Note 3)

* These parameters are characterized but not tested.

† Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not tested.

  1. 1.Total Absolute Error is the sum of the offset, gain and integral nonlinearity (INL) errors.
  2. 2.The ADC conversion result never decreases with an increase in the input and has no missing codes.
  3. 3.This is the impedance seen by the VREF pads when the external reference pads are selected.