PIC18F258-ESLASHLSQTP datasheet(361/402 Pages) MICROCHIP

361 / 402 page

DS41159E-page 359

PIC18FXX8

FIGURE 27-23:

A/D CONVERSION TIMING

TABLE 27-24: A/D CONVERSION REQUIREMENTS

131

130

132

BSF ADCON0, GO

A/D CLK

A/D DATA

ADRES

ADIF

SAMPLE

OLD_DATA

SAMPLING STOPPED

DONE

NEW_DATA

(Note 2)

Note

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.

. . .

TCY

Param

No.

Symbol

Characteristic

Min

Max

Units

Conditions

130

TAD

A/d Clock Period

PIC18FXX8

1.6

20(5)

μsTOSC based, VREF ≥ 3.0V

PIC18LFXX8

3.0

20(5)

μsTOSC based, VREF full range

PIC18FXX8

2.0

6.0

μs

A/D RC mode

PIC18LFXX8

3.0

9.0

μs

A/D RC mode

131

TCNV

Conversion Time

(not including acquisition time) (Note 1)

TAD

132

TACQ

Acquisition Time (Note 3)

—

μs

-40

°C ≤ Temp ≤ +125°C

135

TSWC

Switching Time from Convert

→ Sample

—

(Note 4)

136

TAMP

Amplifier Settling Time (Note 2)

1—

μs

This may be used if the

“new” input voltage has not

changed by more than 1 LSb

(i.e., 5 mV @ 5.12V) from the

last sampled voltage (as

stated on CHOLD).

Note 1:

ADRES register may be read on the following TCY cycle.

See Section 20.0 “Compatible 10-Bit Analog-to-Digital Converter (A/D) Module” for minimum

conditions when input voltage has changed more than 1 LSb.

The time for the holding capacitor to acquire the “New” input voltage when the voltage changes full scale

after the conversion (AVDD to AVSS or AVSS to AVDD). The source impedance (

RS) on the input channels

is 50

Ω.

On the next Q4 cycle of the device clock.

The time of the A/D clock period is dependent on the device frequency and the TAD clock divider.

PIC18F258-E/LSQTP Datasheet(PDF) 361 Page - Microchip Technology

PIC18F258-E/LSQTP Datasheet(HTML) 361 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL