PIC16 datasheet(137/418 Pages) MICROCHIP

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DS40001609C-page 137

PIC16(L)F1508/9

TABLE 15-1:

ADC CLOCK PERIOD (TAD) VS. DEVICE OPERATING FREQUENCIES

FIGURE 15-2:

ANALOG-TO-DIGITAL CONVERSION TAD CYCLES

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

000

100 ns

125 ns

250 ns

500 ns

2.0

s

Fosc/4

100

200 ns

250 ns

500 ns

1.0

s4.0 s

Fosc/8

001

400 ns

500 ns

1.0

s2.0 s

8.0

s

Fosc/16

101

800 ns

1.0

s2.0 s4.0 s

16.0

s

Fosc/32

010

1.6

s2.0 s4.0 s

8.0

s

32.0

s

Fosc/64

110

3.2

s4.0 s

8.0

s

16.0

s

64.0

s

FRC

x11

1.0-6.0

s

1.0-6.0

s

1.0-6.0

s

1.0-6.0

s

1.0-6.0

s

Legend: Shaded cells are outside of recommended range.

Note:

The TAD period when using the FRC clock source can fall within a specified range, (see TAD parameter).

The TAD period when using the FOSC-based clock source can be configured for a more precise TAD period.

However, the FRC clock source must be used when conversions are to be performed with the device in

Sleep mode.

TAD1TAD2TAD3TAD4TAD5TAD6TAD7TAD8TAD9TAD10

TAD11

SetGObit

Conversion Starts

Holding capacitor disconnected

from analog input (THCD).

On the following cycle:

ADRESH:ADRESL is loaded,

GO bit is cleared,

ADIF bit is set,

holding capacitor is reconnected to analog input.

Enable ADC (ADON bit)

and

Select channel (ACS bits)

THCD

TACQ

Rev. 10-000035A

7/30/2013

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