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Sheet目录3873

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2006 Microchip Technology Inc.

Preliminary

DS70178C-page 169

dsPIC30F1010/202X

16.0

10-BIT 2 MSPS ANALOG-TO-

DIGITAL CONVERTER (ADC)

MODULE

The dsPIC30F1010/202X devices provide high-speed

successive approximation analog to digital conversions

to support applications such as AC/DC and DC/DC

power converters.

16.1

Features

10-bit resolution

Uni-polar Inputs

Up to 12 input channels

±1 LSB accuracy

Single supply operation

2000 ksps conversion rate at 5V

1000 ksps conversion rate at 3.0V

Low power CMOS technology

16.2

Description

This ADC module is designed for applications that

require low latency between the request for conversion

and the resultant output data. Typical applications

include:

AC/DC power supplies

DC/DC converters

Power factor correction

This ADC works with the Power Supply PWM module

in power control applications that require high-fre-

quency control loops. This module can sample and

convert two analog inputs in one microsecond. The one

microsecond conversion delay reduces the “phase lag”

between measurement and control system response.

Up to 4 inputs may be sampled at a time, and up to 12

inputs may request conversion at a time. If multiple

inputs request conversion, the ADC will convert them in

a sequential manner starting with the lowest order

input.

This ADC design provides each pair of analog inputs

(AN1,AN0), (AN3,AN2), ... , the ability to specify its own

trigger source out of a maximum of sixteen different

trigger sources. This capability allows this ADC to sam-

ple and convert analog inputs that are associated with

PWM generators operating on independent time

bases.

There is no operation during Sleep mode. The user

applications typically require synchronization between

analog data sampling and PWM output to the applica-

tion circuit. The very high speed operation of this ADC

module allows “data on demand”.

In addition, several hardware features have been

added to the peripheral interface to improve real-time

performance in a typical DSP based application.

Result alignment options

Automated sampling

External conversion start control

A block diagram of the ADC module is shown in

Figure 16-1.

16.3

Module Functionality

The 10-bit 2 Msps ADC is designed to support power

conversion applications when used with the Power

Supply PWM module. The 10-bit 2 Msps ADC samples

up to N (N

≤ 12) inputs at a time and then converts two

sampled inputs at a time. The quantity of sample and

hold circuits is determined by a device’s requirements.

The10-Bit 2 Msps ADC produces two 10-bit conversion

results in 1 microsecond.

The ADC module supports up to 12 analog inputs. The

sampled inputs are connected, via multiplexers, to the

converter.

The analog reference voltage is defined as the device

supply voltage (AVDD / AVSS).

The ADC module uses these Control and Status regis-

ters:

A/D Control Register (ADCON)

A/D Status Register (ADSTAT)

A/D Base Register (ADBASE)

A/D Port Configuration Register (ADPCFG)

A/D Convert Pair Control Register #0 (ADCPC0)

A/D Convert Pair Control Register #1 (ADCPC1)

A/D Convert Pair Control Register #2 (ADCPC2)

The ADCON register controls the operation of the ADC

module. The ADSTAT register displays the status of the

conversion processes. The ADPCFG registers config-

ure the port pins as analog inputs or as digital I/O. The

CPC registers control the triggering of the ADC conver-

sions. (See Register 16-1 through Register 16-7 for

detailed bit configurations.)

Note: A unique feature of the ADC module is its abil-

ity to sample inputs in an asynchronous manner.

Individual sample and hold circuits can be triggered

independently of each other.

Note: The PLL must be enabled for the ADC module

function.

This

achieved

using

the

FNOSC<1:0> bits in the FOSCSEL Configuration

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