PIC16F722AT-ISS Datasheet, PDF (89/286 Pages) Microchip Technology – 28-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC16(L)F722A/723A
TABLE 9-1: ADC CLOCK PERIOD (TAD) VS. DEVICE OPERATING FREQUENCIES
ADC Clock Period (TAD)
Device Frequency (FOSC)
ADC
Clock Source
ADCS<2:0>
20 MHz
16 MHz
8 MHz
4 MHz
1 MHz
Fosc/2
Fosc/4
Fosc/8
Fosc/16
Fosc/32
Fosc/64
FRC
000
100 ns⁽²⁾
125 ns⁽²⁾
250 ns⁽²⁾
500 ns⁽²⁾
2.0 s
100
200 ns⁽²⁾
250 ns⁽²⁾
500 ns⁽²⁾
1.0 s
4.0 s
001
400 ns⁽²⁾
0.5 s⁽²⁾
1.0 s
2.0 s
8.0 s⁽³⁾
101
800 ns
1.0 s
2.0 s
4.0 s
16.0 s⁽³⁾
010
1.6 s
2.0 s
4.0 s
8.0 s⁽³⁾
32.0 s⁽³⁾
110
3.2 s
4.0 s
8.0 s⁽³⁾
16.0 s⁽³⁾
64.0 s⁽³⁾
x11
1.0-6.0 s^(1,4) 1.0-6.0 s^(1,4) 1.0-6.0 s^(1,4) 1.0-6.0 s^(1,4) 1.0-6.0 s^(1,4)
Legend: Shaded cells are outside of recommended range.
Note 1:
2:
3:
4:
The FRC source has a typical TAD time of 1.6 s for VDD.
These values violate the minimum required TAD time.
For faster conversion times, the selection of another clock source is recommended.
When the device frequency is greater than 1 MHz, the FRC clock source is only recommended if the
conversion will be performed during Sleep.
FIGURE 9-2:
ANALOG-TO-DIGITAL CONVERSION TAD CYCLES
Tcy to TAD
TAD0
TAD1 TAD2 TAD3 TAD4
TAD5 TAD6 TAD7
TAD8
TAD9
b7
b6
b5
b4
b3
b2
b1
b0
Conversion Starts
Holding Capacitor is Disconnected from Analog Input (typically 100 ns)
Set GO/DONE bit
ADRES register is loaded,
GO/DONE bit is cleared,
ADIF bit is set,
Holding capacitor is connected to analog input
 2010-2012 Microchip Technology Inc.
DS41417B-page 89