Datasheet

PIC18F2XK20/4XK20
DS41303G-page 276  2010 Microchip Technology Inc.
FIGURE 19-5: ANALOG INPUT MODEL
FIGURE 19-6: ADC TRANSFER FUNCTION
CPIN
VA
Rs
ANx
5 pF
VDD
I LEAKAGE
(1)
RIC  1k
Sampling
Switch
SS
Rss
C
HOLD = 13.5 pF
V
SS/VREF-
2.5V
Rss (k)
2.0V
1.5V
.1 1 10
V
DD
Legend: CPIN
I LEAKAGE
RIC
SS
C
HOLD
= Input Capacitance
= Leakage current at the pin due to
= Interconnect Resistance
= Sampling Switch
= Sample/Hold Capacitance
various junctions
Discharge
Switch
3.0V
3.5V
100
Note 1: See Section 26.0 “Electrical Characteristics”.
3FFh
3FEh
ADC Output Code
3FDh
3FCh
004h
003h
002h
001h
000h
Full-Scale
3FBh
1/2 LSB ideal
V
SS/VREF-
Zero-Scale
Transition
V
DD/VREF+
Transition
1/2 LSB ideal
Full-Scale Range
Analog Input Voltage