Mikroelektronika MikroE Development Kits MIKROE-999 Scheda Tecnica
Codici prodotto
MIKROE-999
PIC18F6520/8520/6620/8620/6720/8720
DS39609B-page 340
2004 Microchip Technology Inc.
TABLE 26-25: A/D CONVERTER CHARACTERISTICS: PIC18FXX20 (INDUSTRIAL, EXTENDED)
PIC18LFXX20 (INDUSTRIAL)
FIGURE 26-26:
A/D CONVERSION TIMING
Param
No.
Symbol
Characteristic
Min
Typ
Max
Units
Conditions
A01
N
R
Resolution
—
—
10
bit
A03
E
IL
Integral Linearity Error
—
—
<±1
LSb
V
REF
= V
DD
= 5.0V
A04
E
DL
Differential Linearity Error
—
—
<±1
LSb
V
REF
= V
DD
= 5.0V
A05
E
G
Gain Error
—
—
<±1
LSb
V
REF
= V
DD
= 5.0V
A06
E
OFF
Offset Error
—
—
<±1.5
LSb
V
REF
= V
DD
= 5.0V
A10
—
Monotonicity
guaranteed
(2)
—
V
SS
≤
V
AIN
≤
V
REF
A20
A20A
A20A
V
REF
Reference Voltage
(V
(V
REFH
– V
REFL
)
1.8V
3V
—
—
—
—
—
—
V
V
V
V
DD
< 3.0V
V
DD
≥
3.0V
A21
V
REFH
Reference Voltage High
AV
SS
—
AV
DD
+ 0.3V
V
A22
V
REFL
Reference Voltage Low
AV
SS
– 0.3V
(5)
—
V
REFH
V
A25
V
AIN
Analog Input Voltage
AV
SS
– 0.3V
(5)
—
AV
DD
+ 0.3V
(5)
V
V
DD
≥
2.5V (Note 3)
A30
Z
AIN
Recommended Impedance of
Analog Voltage Source
Analog Voltage Source
—
—
2.5
k
Ω
(Note 4)
A50
I
REF
V
REF
Input Current (Note 1)
—
—
—
—
—
—
5
150
µ
A
µ
A
During V
AIN
acquisition.
During A/D conversion
cycle.
cycle.
Note 1:
Vss
≤
V
AIN
≤
V
REF
2:
The A/D conversion result never decreases with an increase in the input voltage and has no missing codes.
3:
For V
DD
< 2.5V, V
AIN
should be limited to <.5 V
DD
.
4:
Maximum allowed impedance for analog voltage source is 10 k
Ω
. This requires higher acquisition times.
5:
IV
DD
– AV
DD
I must be <3.0V and IAV
SS
– V
SS
I must be <0.3V.
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)
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