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PIC18F242 Datasheet(PDF) 290 Page - Microchip Technology

Part # PIC18F242
Description  High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D
PDF  332 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F242 Datasheet(HTML) 290 Page - Microchip Technology

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PIC18FXX2
DS39564C-page 288
© 2006 Microchip Technology Inc.
TABLE 22-22: A/D CONVERSION REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
Max
Units
Conditions
130
TAD
A/D clock period
PIC18FXXX
1.6
20(4)
μsTOSC based
PIC18FXXX
2.0
6.0
μs
A/D RC mode
131
TCNV
Conversion time
(not including acquisition time) (Note 1)
11
12
TAD
132
TACQ
Acquisition time (Note 2)
5
10
—
—
μs
μs
VREF = VDD = 5.0V
VREF = VDD = 2.5V
135
TSWC
Switching Time from convert
→ sample
—
(Note 3)
Note 1: ADRES register may be read on the following TCY cycle.
2: The time for the holding capacitor to acquire the “New” input voltage, when the new input value has not
changed by more than 1 LSB from the last sampled voltage. The source impedance (
RS) on the input channels
is 50
Ω. See Section 17.0 for more information on acquisition time consideration.
3: On the next Q4 cycle of the device clock.
4: The time of the A/D clock period is dependent on the device frequency and the TAD clock divider.



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