PIC16F72 Datasheet, PDF (107/136 Pages) Microchip Technology – 28-Pin, 8-Bit CMOS FLASH MCU with A/D Converter

PIC16F72
FIGURE 14-16: A/D CONVERSION TIMING
BSF ADCON0, GO
134
(TOSC/2)⁽¹⁾
131
Q4
130
A/D CLK ¹³²
1 TCY
A/D DATA
7
6
5
4
3
2
1
0
ADRES
OLD_DATA
NEW_DATA
ADIF
GO
DONE
SAMPLE
SAMPLING STOPPED
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.
TABLE 14-10: A/D CONVERSION REQUIREMENTS
Param
No.
Sym
Characteristic
Min Typ† Max Units
Conditions
130 TAD A/D Clock Period
PIC16F72
1.6 — — µs TOSC based, VREF ≥ 3.0V
PIC16LF72
2.0 — — µs TOSC based,
2.0V ≤ VREF ≤ 5.5V
PIC16F72
2.0 4.0 6.0 µs A/D RC mode
PIC16LF72 3.0 6.0 9.0 µs A/D RC mode
131 TCNV Conversion Time (not including S/H time)
(Note 1)
9
—
9 TAD
132 TACQ Acquisition Time
5* — — µs 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., 20.0 mV @ 5.12V) from
the last sampled voltage (as
stated on CHOLD).
134 TGO Q4 to A/D Clock Start
— TOSC/2 —
— 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.
* 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 TCY cycle.
 2002 Microchip Technology Inc.
DS39597B-page 105