Datasheet

PIC18F46J11 FAMILY
DS39932D-page 506  2011 Microchip Technology Inc.
FIGURE 29-23: A/D CONVERSION TIMING
TABLE 29-31: A/D CONVERSION REQUIREMENTS
131
130
132
BSF ADCON0, GO
Q4
A/D CLK
A/D DATA
ADRES
ADIF
GO
SAMPLE
OLD_DATA
SAMPLING STOPPED
DONE
NEW_DATA
(Note 2)
987 21 0
Note 1: 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.
2: This is a minimal RC delay (typically 100 ns), which also disconnects the holding capacitor from the analog input.
. . .
. . .
TCY (Note 1)
Param
No.
Symbol Characteristic Min Max Units Conditions
130 T
AD A/D Clock Period 0.7 25.0
(1)
sTOSC based, VREF  3.0V
131 TCNV Conversion Time
(not including acquisition time)
(2)
11
—
12
1
TAD
s
A/D RC Mode
132 T
ACQ Acquisition Time
(3)
1.4 — s-40C to +85C
135 TSWC Switching Time from Convert  Sample — (Note 4)
137 TDIS Discharge Time 0.2 — s
Note 1: The time of the A/D clock period is dependent on the device frequency and the T
AD clock divider.
2: ADRES registers may be read on the following T
CY cycle.
3: The time for the holding capacitor to acquire the “New” input voltage when the voltage changes full scale
after the conversion (V
DD to VSS or VSS to VDD). The source impedance (RS) on the input channels is 50.
4: On the following cycle of the device clock.