Microchip Technology IC MCU FLASH PIC16F874-20I/P DIP-40 MCP PIC16F874-20I/P Hoja De Datos
Los códigos de productos
PIC16F874-20I/P
1998-2013 Microchip Technology Inc.
DS30292D-page 175
PIC16F87X
FIGURE 15-21:
A/D CONVERSION TIMING
TABLE 15-13: 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)
9
8
7
2
1
0
Note: 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
Param
No.
Sym
Characteristic
Min
Typ†
Max
Units
Conditions
130
T
AD
A/D clock period
Standard(F)
1.6
—
—
s
T
OSC
based, V
REF
3.0V
Extended(LF)
3.0
—
—
s
T
OSC
based, V
REF
2.0V
Standard(F)
2.0
4.0
6.0
s
A/D RC mode
Extended(LF)
3.0
6.0
9.0
s
A/D RC mode
131
T
CNV
Conversion time (not including S/H time)
(Note 1)
(Note 1)
—
12
T
AD
132
T
ACQ
Acquisition time
(Note 2)
10*
40
—
—
—
s
s
The minimum time is the
amplifier settling time. This may
be used if the "new" input volt-
age has not changed by more
than 1 LSb (i.e., 20.0 mV @
5.12V) from the last sampled
voltage (as stated on C
amplifier settling time. This may
be used if the "new" input volt-
age has not changed by more
than 1 LSb (i.e., 20.0 mV @
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
selected as RC, a time of T
CY
is
added before the A/D clock
starts. This allows the SLEEP
instruction to be executed.
starts. This allows the SLEEP
instruction to be executed.
*
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.
not tested.
§
This specification ensured by design.
Note 1: ADRES register may be read on the following T
CY
cycle.
2: See Section 11.1 for minimum conditions.