DSPIC30F3012AT20ESLASHML datasheet(111/205 Pages) MICROCHIP

111 / 205 page

DS70139E-page 109

dsPIC30F2011/2012/3012/3013

16.0

12-BIT ANALOG-TO-DIGITAL

CONVERTER (ADC) MODULE

The 12-bit Analog-to-Digital Converter allows conver-

sion of an analog input signal to a 12-bit digital number.

This module is based on a Successive Approximation

sampling rate of 200 ksps. The ADC module has up to

10 analog inputs which are multiplexed 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 voltage is software select-

able to either the device supply voltage (AVDD/AVSS) or

the voltage level on the (VREF+/VREF-) pin. The ADC

has a unique feature of being able to operate while the

device is in Sleep mode with RC oscillator selection.

The ADC 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

control the operation of the ADC module. The ADCHS

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 ADC module is shown

in Figure 16-1.

FIGURE 16-1:

12-BIT ADC FUNCTIONAL BLOCK DIAGRAM

Note: This data sheet summarizes features of this group

of dsPIC30F devices and is not intended to be a complete

reference source. For more information on the CPU,

peripherals, register descriptions and general device

functionality, refer to the “dsPIC30F Family Reference

Manual” (DS70046).

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

AVDD/VREF+

DAC

16-word, 12-bit

Dual Port

Buffer

0000

0101

0111

1001

0001

0010

0011

0100

0110

1000

AN8

AN9

AN4

AN5

AN6

AN7

AN0

AN1

AN2

AN3

CH0

AVSS/VREF-

Sample/Sequence

Control

Sample

Input MUX

Control

Input

Switches

S/H

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