DSPIC30F datasheet(129/220 Pages) MICROCHIP

129 / 220 page

 2004 Microchip Technology Inc.

Preliminary

DS70116C-page 127

dsPIC30F5011/5013

19.0

12-BIT ANALOG-TO-DIGITAL

CONVERTER (A/D) MODULE

The 12-bit Analog-to-Digital converter (A/D) allows

conversion of an analog input signal to a 12-bit digital

number. This module is based on a Successive

Approximation Register (SAR) architecture and pro-

vides a maximum sampling rate of 100 ksps. The A/D

module has up to 16 analog inputs which are multi-

plexed into a sample and hold amplifier. The output of

the sample and hold is the input into the converter

which generates the result. The analog reference volt-

age is software selectable to either the device supply

voltage (AVDD/AVSS) or the voltage level on the

(VREF+/VREF-) pin. The A/D converter has a unique

feature of being able to operate while the device is in

Sleep mode with RC oscillator selection.

The A/D module has six 16-bit registers:

• A/D Control Register 1 (ADCON1)

• A/D Control Register 2 (ADCON2)

• A/D Control Register 3 (ADCON3)

• A/D Input Select Register (ADCHS)

• A/D Port Configuration Register (ADPCFG)

• A/D Input Scan Selection Register (ADCSSL)

The ADCON1, ADCON2 and ADCON3 registers con-

trol the operation of the A/D module. The ADCHS reg-

ister selects the input channels to be converted. The

ADPCFG register configures the port pins as analog

inputs or as digital I/O. The ADCSSL register selects

inputs for scanning.

The block diagram of the 12-bit A/D module is shown in

Figure 19-1.

FIGURE 19-1:

12-BIT A/D FUNCTIONAL BLOCK DIAGRAM

Note:

The SSRC<2:0>, ASAM, SMPI<3:0>,

BUFM and ALTS bits, as well as the

ADCON3 and ADCSSL registers, must

not be written to while ADON = 1. This

would lead to indeterminate results.

Comparator

12-bit SAR

Conversion Logic

VREF+

AVSS

AVDD

DAC

16-word, 12-bit

Dual Port

Buffer

AN12

0000

0101

0111

1001

1101

1110

1111

1100

0001

0010

0011

0100

0110

1000

1010

1011

AN13

AN14

AN15

AN8

AN9

AN10

AN11

AN4

AN5

AN6

AN7

AN0

AN1

AN2

AN3

CH0

CH0R

CH0G

VREF-

Sample/Sequence

Control

Sample

Input Mux

Control

Input

Switches

S/H

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