PIC18F2450-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F2450-I/SO

24/40/44-Pin High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC18F2450/4450

TABLE 21-17: A/D CONVERTER CHARACTERISTICS: PIC18F2450/4450 (INDUSTRIAL)

PIC18LF2450/4450 (INDUSTRIAL)

Param

No.

Symbol

Characteristic

Min

Typ

Max Units

Conditions

A01 NR

Resolution

—

—

10

bit ΔVREF ≥ 3.0V

A03 EIL

Integral Linearity Error

—

—

<±1

LSb ΔVREF ≥ 3.0V

A04 EDL Differential Linearity Error

—

—

<±1

LSb ΔVREF ≥ 3.0V

A06 EOFF Offset Error

—

—

<±2

LSb ΔVREF ≥ 3.0V

A07 EGN

A10 —

Gain Error

Monotonicity

—

—

<±1

Guaranteed(1)

LSb ΔVREF ≥ 3.0V

— VSS ≤ VAIN ≤ VREF

A20 ΔVREF Reference Voltage Range

(VREFH – VREFL)

1.8

—

3

—

—

V VDD < 3.0V

—

V VDD ≥ 3.0V

A21 VREFH Reference Voltage High

VSS

—

VREFH

V

A22 VREFL Reference Voltage Low

VSS – 0.3V — VDD – 3.0V V

A25 VAIN Analog Input Voltage

VREFL

—

VREFH

V

A30 ZAIN Recommended Impedance of

—

—

2.5

kΩ

Analog Voltage Source

A50 IREF VREF Input Current(2)

—

—

5

μA During VAIN acquisition.

—

—

150

μA During A/D conversion

cycle.

Note 1: The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.

2: VREFH current is from RA3/AN3/VREF+ pin or VDD, whichever is selected as the VREFH source.

VREFL current is from RA2/AN2/VREF- pin or VSS, whichever is selected as the VREFL source.

FIGURE 21-14: A/D CONVERSION TIMING

BSF ADCON0, GO

(Note 2)

131

Q4

130

A/D CLK 132

A/D DATA

9

8 7 ... ... 2

1

0

ADRES

ADIF

GO

SAMPLE

OLD_DATA

SAMPLING STOPPED

NEW_DATA

TCY(1)

DONE

Note 1:

2:

If the A/D clock source is selected as RC, a time of TCY is added before the A/D clock starts. This allows the SLEEP instruction

to be executed.

This is a minimal RC delay (typically 100 ns), which also disconnects the holding capacitor from the analog input.

© 2008 Microchip Technology Inc.

DS39760D-page 293

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