PIC17C7XX Datasheet, PDF (182/328 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers with 10-bit A/D

PIC17C7XX
FIGURE 16-5: ANALOG INPUT MODEL
Rs ^ANx
VDD
VT = 0.6V
VA
CPIN
5 pF
VT = 0.6V
RIC ≤ 1k
Sampling
Switch
SS _RSS
I leakage
± 500 nA
CHOLD
= DAC capacitance
= 120 pF
VSS
Legend CPIN
= input capacitance
VT
= threshold voltage
I leakage = leakage current at the pin due to
various junctions
RIC
SS
CHOLD
= interconnect resistance
= sampling switch
= sample/hold capacitance (from DAC)
6V
5V
VDD 4V
3V
2V
5 6 7 8 9 10 11
Sampling Switch
( kΩ )
DS30289A-page 182
© 1998 Microchip Technology Inc.