ADC

Table 1. ADC Accuracy Specifications
Operating Conditions:
  • VDD = 3.0V
  • TA = 25ºC
Symbol Description Min. Typ. ✝ Max. Unit Conditions
NR Resolution 12 bit  
EINL Integral nonlinearity error -1 0.1 1 LSb  
EDNL Differential nonlinearity error(1) -1 0.1 1 LSb  
EOFF Offset error 1.3 3 5 LSb  
EGAIN Gain error -5 1.5 5 LSb  
EABS Absolute error LSb  
VADCREF ADC reference voltage 1.024 VDD V  
VAIN Full-scale range GND VADCREF V  
ZAIN Recommended impedance of analog voltage source 10  
RVREFA ADC voltage reference ladder impedance(2) 50  

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

Notes:
  1. 1.The ADC conversion result never decreases with an increase in the input and has no missing codes.
  2. 2.This is the impedance seen by the VREFA pin when the external reference is selected.
Table 2. ADC Conversion Timing Specifications
Symbol Description Min. Typ. ✝ Max. Unit Conditions
TCLK_ADC * ADC clock period 0.5 8 μs  
tCNV Conversion time 13.5TCLK_ADC + 2TCLK_PER    
tACQ Acquisition time 2TCLK_ADC μs  
fADC * Sample rate 8 130 ksps  
tS Sampling time 2TCLK_ADC    
tSENSE * Delay for changing MUXPOS to TEMP 40 μs  
tADC_INIT * Initialization time 6 μs  

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

* These parameters are characterized but not tested in production.