Microchip Technology DV164136 Data Sheet

Page of 446
PIC18F8722 FAMILY
DS39646C-page 416
© 2008 Microchip Technology Inc.
TABLE 28-26: A/D CONVERTER CHARACTERISTICS: PIC18F6X27/6X22/8X27/8X22 (INDUSTRIAL)
PIC18LF6X27/6X22/8X27/8X22 (INDUSTRIAL) 
FIGURE 28-25:
A/D CONVERSION TIMING   
Param 
No.
Symbol
Characteristic
Min
Typ
Max
Units
Conditions
A01
N
R
Resolution
10
bit
ΔV
REF
 
≥ 3.0V 
A03
E
IL
Integral Linearity Error
<±1 
LSb
ΔV
REF
 
≥ 3.0V 
A04
E
DL
Differential Linearity Error
<±1
LSb
ΔV
REF
 
≥ 3.0V 
A06
E
OFF
Offset Error
<±2
LSb
ΔV
REF
 
≥ 3.0V 
A07
E
GN
Gain Error
<±1
LSb
ΔV
REF
 
≥ 3.0V 
A10
Monotonicity
Guaranteed
(1)
V
SS
 
≤ V
AIN
 
≤ V
REF
A20
ΔV
REF
Reference Voltage Range
(V
REFH
 – V
REFL
)
1.8
3


V
V
V
DD
 
< 3.0V
V
DD
 
≥ 3.0V
A21
V
REFH
Reference Voltage High
V
SS
V
REFH
V
A22
V
REFL
Reference Voltage Low
V
SS
 – 0.3V
V
DD
 – 3.0V
V
A25
V
AIN
Analog Input Voltage
V
REFL
V
REFH
V
A30
Z
AIN
Recommended Impedance of 
Analog Voltage Source
2.5
k
Ω
A40
I
AD
A/D Current 
from V
DD
PIC18FXXXX
180
μA Average current during 
conversion
PIC18LFXXXX
90
μA
A50
I
REF
V
REF
 Input Current
(2)


5
150
μA
μA
During V
AIN
 acquisition.
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:
V
REFH
 current is from RA3/AN3/V
REF
+ pin or V
DD
, whichever is selected as the V
REFH
 source.
V
REFL
 current is from RA2/AN2/V
REF
- pin or V
SS
, whichever is selected as the V
REFL
 source.
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 1, 2)
9
8
7
2
1
0
Note
1:
If the A/D clock source is selected as RC, a time of T
CY
 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.
. . .
. . .
T
CY