ST7LITE2_06 Datasheet, PDF (117/133 Pages) STMicroelectronics – 8-BIT MICROCONTROLLER WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI

ADC CHARACTERISTICS (Cont’d)
Figure 91. ADC Accuracy Characteristics with amplifier enabled
ST7LITE2
Digital Result ADCDR
704
1LSBIDEAL
=
V-----D-----D-----–_{-----V----S-----S--}
1024
(2)
E_T
E_O
E_L
108
1 LSB_IDEAL
0
1234567
V_SS62.5mV
E_G
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
(3)
(1)
E_D
E_T=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
E_O=Offset Error: deviation between the first actual
transition and the first ideal one.
E_G=Gain Error: deviation between the last ideal
transition and the last actual one.
E_D=Differential Linearity Error: maximum deviation
between actual steps and the ideal one.
E_L=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
701 702 703 704
430mV
V_in (LSB_IDEAL)
V_in (OPAMP)
Note: When the AMPSEL bit in the ADCDRL register is set, it is mandatory that f_ADC be less than or equal
to 2 MHz. (if f_CPU=8MHz. then SPEED=0, SLOW=1).
Vout (ADC input)
Vmax
Vmin
0V
Noise
430mV
Vin
(OPAMP input)
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