Microchip Technology AC160214 Data Sheet
2010-2012 Microchip Technology Inc.
DS41414D-page 173
PIC16(L)F1946/47
FIGURE 16-4:
ANALOG INPUT MODEL
FIGURE 16-5:
ADC TRANSFER FUNCTION
Note 1:
The reference voltage (V
REF
) has no effect on the equation, since it cancels itself out.
2:
The charge holding capacitor (C
HOLD
) is not discharged after each conversion.
3:
The maximum recommended impedance for analog sources is 10 k
. This is required to meet the pin
leakage specification.
C
PIN
VA
Rs
Analog
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
)
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:
Refer to
.
R
SS
= Resistance of Sampling Switch
Input
pin
3FFh
3FEh
ADC
O
u
tput
Code
3FDh
3FCh
3FCh
03h
02h
01h
00h
02h
01h
00h
Full-Scale
3FBh
0.5 LSB
V
REF
-
Zero-Scale
Transition
V
REF
+
Transition
1.5 LSB
Full-Scale Range
Analog Input Voltage