PIC18F23K20 Datasheet, PDF (268/420 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2XK20/4XK20
FIGURE 19-5:
ANALOG INPUT MODEL
Rs ^ANx
VDD
VT = 0.6V
RIC ≤ 1k
Sampling
Switch
SS _Rss
VA
CPIN
5 pF
VT = 0.6V
I LEAKAGE⁽¹⁾
Discharge
Switch
CHOLD = 13.5 pF
VSS/VREF-
Legend: CPIN
= Input Capacitance
VT
= Threshold Voltage
I LEAKAGE = Leakage current at the pin due to
various junctions
RIC
= Interconnect Resistance
SS
= Sampling Switch
CHOLD = Sample/Hold Capacitance
Note 1: See Section 26.0 “Electrical Characteristics”.
3.5V
3.0V
2.5V
2.0V
1.5V
.1
1 10 100
Rss (kΩ)
FIGURE 19-6:
ADC TRANSFER FUNCTION
Full-Scale Range
3FFh
3FEh
3FDh
3FCh
3FBh
004h
003h
002h
001h
000h
VSS/VREF-
1/2 LSB ideal
Zero-Scale
Transition
1/2 LSB ideal
Full-Scale
Transition
Analog Input Voltage
VDD/VREF+
DS41303B-page 266
Advance Information
© 2007 Microchip Technology Inc.