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| PIC16LF720_11 Datasheet, PDF (84/244 Pages) Microchip Technology – 20-Pin Flash Microcontrollers with nanoWatt XLP Technology | |||
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PIC16(L)F720/721
Note 1: The reference voltage (VREF) has no effect on the equation, since it cancels itself out.
2: The charge holding capacitor (CHOLD) is not discharged after each conversion.
3: The maximum recommended impedance for analog sources is 10 kï. This is required to meet the pin
leakage specification.
FIGURE 9-3:
ANALOG INPUT MODEL
Rs ANx
VDD
VT ï» 0.6V
RIC ï£ 1k
Sampling
Switch
SS Rss
VA
CPIN
5 pF
VT ï» 0.6V
I LEAKAGE(1)
CHOLD = 20 pF
VSS
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 âElectrical Specificationsâ.
6V
VDD 4V
2V
5
10
15
20
Sampling Switch, Typical
(kï)
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
DS41430B-page 84
Preliminary
ï£ 2011 Microchip Technology Inc.
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