PIC16F722 Datasheet, PDF (107/302 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16F72X/PIC16LF72X
FIGURE 9-3:
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⁾
CHOLD = 10 pF
VSS/VREF-
Legend: CHOLD
CPIN
= Sample/Hold Capacitance
= Input Capacitance
I LEAKAGE = Leakage current at the pin due to
various junctions
RIC
= Interconnect Resistance
RSS
= Resistance of Sampling Switch
SS
= Sampling Switch
VT
= Threshold Voltage
Note 1: Refer to Section 23.0 “Electrical Specifications”.
6V
5V
RSS
VDD 4V
3V
2V
5 6 7 8 9 10 11
Sampling Switch
(kΩ)
FIGURE 9-4:
ADC TRANSFER FUNCTION
FFh
FEh
FDh
FCh
FBh
04h
03h
02h
01h
00h
VSS
Full-Scale Range
1 LSB ideal
Zero-Scale
Transition
1 LSB ideal
Full-Scale
Transition
Analog Input Voltage
VREF
© 2009 Microchip Technology Inc.
DS41341E-page 107