PIC16F720_13 Datasheet, PDF (203/254 Pages) Microchip Technology – 20-Pin Flash Microcontrollers

PIC16(L)F720/721
TABLE 23-8: PIC16F720/721 A/D CONVERSION REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Operating temperature -40°C  TA  +125°C
Param.
No.
Sym.
Characteristic
AD130* TAD A/D Clock Period
AD131 TCNV
AD132* TACQ
A/D Internal RC Oscillator
Period
Conversion Time (not including
Acquisition Time)⁽¹⁾
Acquisition Time
Min.
1.0
4.0
1.0
—
Typ†
—
—
2.0
10.5
2
Max. Units
Conditions
9.0
16.0
6.0
—
—
S VDD  2.0V⁽²⁾
S VDD  2.0V⁽²⁾
(ADRC mode)
S
TAD Set GO/DONE bit to new data in A/D
Result register
S VDD = 3.0V, EC or INTOSC Clock
mode⁽³⁾
* These parameters are characterized but not tested.
† Data in “Typ” column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
Note 1: The ADRES register may be read on the following TCY cycle.
2: Setting of 16.0 s TAD not recommended for temperature > 85°C.
3: If ADRC mode is selected for use with VDD 2.0V, longer acquisition times will be required (see Section 9.3 “A/D
Acquisition Requirements”)
FIGURE 23-11: PIC16F720/721 A/D CONVERSION TIMING (NORMAL MODE)
BSF ADCON0, GO
AD134
Q4
A/D CLK
A/D Data
(TOSC/2⁽¹⁾)
AD131
AD130
1 TCY
7
6
5
4
3
2
1
0
ADRES
ADIF
GO
Sample ^AD132
OLD_DATA
Sampling Stopped
NEW_DATA
1 TCY
DONE
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.
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DS41430D-page 203