48GA004 datasheet(191/268 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS39881D-page 191

PIC24FJ64GA004 FAMILY

21.0

10-BIT HIGH-SPEED A/D

CONVERTER

The 10-bit A/D Converter has the following key

features:

• Successive Approximation (SAR) conversion

• Conversion speeds of up to 500 ksps

• Up to 13 analog input pins

• External voltage reference input pins

• Automatic Channel Scan mode

• Selectable conversion trigger source

• 16-word conversion result buffer

• Selectable Buffer Fill modes

• Four result alignment options

• Operation during CPU Sleep and Idle modes

Depending on the particular device pinout, the 10-bit

A/D Converter can have up to three analog input pins,

designated AN0 through AN12. In addition, there are

two analog input pins for external voltage reference

connections. These voltage reference inputs may be

shared with other analog input pins. The actual number

of analog input pins and external voltage reference

input configuration will depend on the specific device.

A block diagram of the A/D Converter is shown in

Figure 21-1.

To perform an A/D conversion:

Configure the A/D module:

a) Select

port

pins

analog

inputs

(AD1PCFG<15:0>).

b) Select voltage reference source to match

expected

range

analog

inputs

(AD1CON2<15:13>).

Select the analog conversion clock to

match desired data rate with processor

clock (AD1CON3<7:0>).

d) Select the appropriate sample/conversion

sequence

(AD1CON1<7:5>

and

AD1CON3<12:8>).

e) Select

how

conversion

results

are

presented in the buffer (AD1CON1<9:8>).

Select interrupt rate (AD1CON2<5:2>).

g) Turn on A/D module (AD1CON1<15>).

Configure A/D interrupt (if required):

a) Clear the AD1IF bit.

b) Select A/D interrupt priority.

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to the

“PIC24F

Family

Reference

Manual”

”Section 17. 10-Bit A/D Converter”

(DS39705).

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