PIC16F720T-E/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F720T-E/SS

20-Pin Flash Microcontrollers

Microchip Technology 

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 k. This is required to meet the pin

leakage specification.

FIGURE 9-3:

ANALOG INPUT MODEL

Rs ANx

VDD

VT  0.6V

RIC  1k

Sampling

Switch

SS Rss

VA

CPIN

5 pF

VT  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 “Electrical Specifications”.

6V

VDD 4V

2V

5

10

15

20

Sampling Switch, Typical

(k)

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

DS41430D-page 82

 2010-2013 Microchip Technology Inc.

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