PIC16F72-04I/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F72-04I/SS

28-Pin, 8-Bit CMOS FLASH Microcontoller with A/D Converter

Microchip Technology 

PIC16F72

FIGURE 10-1:

A/D BLOCK DIAGRAM

A/D

Converter

VAIN

(Input Voltage)

VDD

VREF

000 or

010 or

100

(Reference

Voltage)

001 or

011 or

101

PCFG2:PCFG0

CHS2:CHS0

100

011

010

001

000

RA5/AN4

RA3/AN3/VREF

RA2/AN2

RA1/AN1

RA0/AN0

FIGURE 10-2:

ANALOG INPUT MODEL

Rs ANx

VA

CPIN

5 pF

VDD

VT = 0.6 V

RIC ≤ 1 k

Sampling

Switch

SS RSS

VT = 0.6 V

I leakage

± 500 nA

CHOLD

= DAC capacitance

= 51.2 pF

VSS

Legend: CPIN

= input capacitance

VT

= threshold voltage

I leakage = leakage current at the pin due to

various junctions

RIC

= interconnect resistance

SS

= sampling switch

CHOLD = sample/hold capacitance (from DAC)

6V

5V

VDD 4V

3V

2V

5 6 7 8 9 10 11

Sampling Switch

( kΩ )

© 2007 Microchip Technology Inc.

DS39597C-page 55

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