64GA106 datasheet(225/330 Pages) MICROCHIP

225 / 330 page

 2010 Microchip Technology Inc.

DS39905E-page 225

PIC24FJ256GA110 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

• 16 Analog Input pins

• External Voltage Reference Input pins

• Internal Band Gap Reference Inputs

• 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

On all PIC24FJ256GA110 family devices, the 10-bit

A/D Converter has 16 analog input pins, designated

AN0 through AN15. In addition, there are two analog

input pins for external voltage reference connections

(VREF+ and VREF-). These voltage reference inputs

may be shared with other analog input pins.

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:

Configure port pins as analog inputs and/or

select

band

gap

reference

input

(AD1PCFGL<15:0> and AD1PCFGH<1:0>).

b) Select voltage reference source to match

expected

range

analog

inputs

(AD1CON2<15:13>).

Select the analog conversion clock to match

the desired data rate with the 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 the 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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