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Microchip Technology AC244045 Data Sheet

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© 2009 Microchip Technology Inc.
DS41341E-page 107
PIC16F72X/PIC16LF72X
FIGURE 9-3:
ANALOG INPUT MODEL        
FIGURE 9-4:
ADC TRANSFER FUNCTION
C
PIN
VA
Rs
ANx
5 pF
V
DD
V
T
 
≈ 0.6V
V
T
 
≈ 0.6V
I 
LEAKAGE
(1)
R
IC
 
≤ 1k
Sampling
Switch
SS
Rss
C
HOLD
 = 10 pF
V
SS
/V
REF
-
6V
Sampling Switch
5V
4V
3V
2V
5 6 7 8 9 10 11
(k
Ω)
V
DD
Legend:
C
PIN
V
T
I 
LEAKAGE
R
IC
SS
C
HOLD
= Input Capacitance
= Threshold Voltage
= Leakage current at the pin due to
= Interconnect Resistance
= Sampling Switch
= Sample/Hold Capacitance
various junctions
R
SS
Note 1:
.
R
SS
= Resistance of Sampling Switch
FFh
FEh
A
DC Out
put 
Co
de
FDh
FCh
04h
03h
02h
01h
00h
Full-Scale
FBh
1 LSB ideal
V
SS
Zero-Scale
Transition
V
REF
Transition
1 LSB ideal
Full-Scale Range
Analog Input Voltage