PIC18F2423 MICROCHIP [Microchip Technology], PIC18F2423 Datasheet - Page 363

• Manufacturer Part Number: PIC18F2423
• Description: 28/40/44-Pin, Enhanced Flash Microcontrollers with 12-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 26-22:
TABLE 26-25: A/D CONVERSION REQUIREMENTS
© 2007 Microchip Technology Inc.
130
131
132
135
TBD
Legend: TBD = To Be Determined
Note 1:
Param
No.
Note 1:
A/D DATA
SAMPLE
2:
3:
4:
A/D CLK
ADRES
BSF ADCON0, GO
T
T
T
T
T
Symbol
ADIF
AD
CNV
ACQ
SWC
DIS
GO
2:
Q4
The time of the A/D clock period is dependent on the device frequency and the T
ADRES registers may be read on the following T
The time for the holding capacitor to acquire the “New” input voltage when the voltage changes full scale
after the conversion (V
On the following cycle of the device clock.
If the A/D clock source is selected as RC, a time of T
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.
132
A/D Clock Period
Conversion Time
(not including acquisition time)
Acquisition Time
Switching Time from Convert → Sample
Discharge Time
A/D CONVERSION TIMING
(Note 2)
Characteristic
DD
11
(3)
to V
10
SS
PIC18FXXXX
PIC18LFXXXX
PIC18FXXXX
PIC18LFXXXX
or V
PIC18F2423/2523/4423/4523
OLD_DATA
9
SS
(2)
Preliminary
to V
. . .
SAMPLING STOPPED
CY
DD
is added before the A/D clock starts.
). The source impedance (R
CY
. . .
130
131
cycle.
TBD
TBD
Min
0.8
1.4
1.4
0.2
13
—
2
(Note 4)
25.0
12.5
Max
14
—
—
1
3
1
(1)
(1)
Units
T
μs
μs
μs
μs
μs
μs
AD
0
S
) on the input channels is 50Ω.
T
V
T
A/D RC mode
V
OSC
OSC
DD
DD
AD
= 3.0V;
= 3.0V; A/D RC mode
based, V
based, V
clock divider.
NEW_DATA
DONE
Conditions
DS39755B-page 361
T
CY
REF
REF
≥ 3.0V
full range