Datasheet

 2010-2011 Microchip Technology Inc. Preliminary DS41440B-page 151
PIC16(L)F1825/1829
16.1.4 CONVERSION CLOCK
The source of the conversion clock is software select-
able via the ADCS bits of the ADCON1 register. There
are seven possible clock options:
•F
OSC/2
•FOSC/4
•FOSC/8
•F
OSC/16
•FOSC/32
•FOSC/64
•F
RC (dedicated internal oscillator)
The time to complete one bit conversion is defined as
TAD. One full 10-bit conversion requires 11.5 TAD peri-
ods as shown in Figure 16-2.
For correct conversion, the appropriate T
AD specifica-
tion must be met. Refer to the A/D conversion require-
ments in Section 30.0 “Electrical Specifications” for
more information. Table 16 -1 gives examples of appro-
priate ADC clock selections.
Note: Unless using the F
RC, any changes in the
system clock frequency will change the
ADC clock frequency, which may
adversely affect the ADC result.