PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 185

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

16.2
The A/D conversion time per bit is defined as T
A/D conversion requires a minimum 12T
conversion. The source of the A/D conversion clock is
software selected. The four possible options for T
are:
• 8T
• 32T
• 64T
• Internal RC oscillator
TABLE 16-1:
TABLE 16-2:
Note:
Note:
2000 Microchip Technology Inc.
OSC
OSC
OSC
Selecting the A/D Conversion
Clock
When the device frequency is greater than 1 MHz, the RC A/D conversion clock source is only
recommended for SLEEP operation.
When the device frequency is greater than 1 MHz, the RC A/D conversion clock source is only
recommended for SLEEP operation.
Operation
Operation
32T
64T
32T
64T
8T
8T
RC
RC
T
T
OSC
OSC
AD
OSC
OSC
AD
OSC
OSC
vs. DEVICE OPERATING FREQUENCIES (EXTENDED VOLTAGE DEVICES (LC))
vs. DEVICE OPERATING FREQUENCIES (STANDARD DEVICES (C))
AD Clock Source (T
AD Clock Source (T
AD
per 10-bit
AD
AD
AD
. The
)
)
ADCS1:ADCS0
ADCS1:ADCS0
AD
00
01
10
11
00
01
10
11
For correct A/D conversions, the A/D conversion clock
(T
of 1.6 s.
Table 16-1 and Table 16-2 show the resultant T
derived from the device operating frequencies and the
A/D clock source selected. These times are for stan-
dard voltage range devices.
AD
) must be selected to ensure a minimum T
PIC17C7XX
Max F
Max F
(MHz)
(MHz)
10.67
21.33
2.67
20
33
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DS30289B-page 185
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OSC
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AD
times
time