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PIC16C63A/65B/73B/74B
DS30605C-page 138
2000 Microchip Technology Inc.
FIGURE 16-20:
A/D CONVERSION TIMING
TABLE 16-17: 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
(T
OSC
/2)
(1)
7
6
5
4
3
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.
1 T
CY
134
Param
No.
Sym
Characteristic
Min
Typ†
Max
Units
Conditions
130
T
AD
A/D clock period
PIC16CXX
1.6
—
—
µ
s
T
OSC
based, V
REF
≥
3.0 V
PIC16LCXX
2.0
—
—
µ
s
T
OSC
based,
2.5V
≤
V
REF
≤
5.5 V
PIC16CXX
2.0
4.0
6.0
µ
s
A/D RC mode
PIC16LCXX
3.0
6.0
9.0
µ
s
A/D RC mode
131
T
CNV
Conversion time (not including S/H
time) (Note 1)
11
—
11
T
AD
132
T
ACQ
Acquisition time
5*
—
—
µ
s
The minimum time is the
amplifier settling time. This
may be used if the “new”
input voltage has not
changed by more than 1 LSb
(i.e., 20.0mV @ 5.12V) from
the last sampled voltage (as
stated on C
HOLD
).
134
T
GO
Q4 to A/D clock start
—
T
OSC
/2
—
—
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.
135
T
SWC
Switching from convert
→
sample time
1.5
—
—
T
AD
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5V, 25
°
C unless otherwise stated. These parameters are for design guidance only and
are not tested.
Note 1: ADRES register may be read on the following T
CY
cycle.
2: See Section 12.1 for minimum conditions.
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