DSPIC33FJ64GS406 datasheet(309/456 Pages) MICROCHIP

309 / 456 page

 2009-2012 Microchip Technology Inc.

DS70591E-page 309

dsPIC33FJ32GS406/606/608/610 and dsPIC33FJ64GS406/606/608/610

22.0 HIGH-SPEED, 10-BIT

ANALOG-TO-DIGITAL

CONVERTER (ADC)

The

dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610 devices provide

high-speed successive approximation Analog-to-Digital

conversions to support applications such as AC/DC and

DC/DC power converters.

22.1

Features Overview

The ADC module incorporates the following features:

• 10-Bit Resolution

• Unipolar Inputs

• Up to Two Successive Approximation Registers

(SARs)

• Up to 24 External Input Channels

• Two Internal Analog Inputs

• Dedicated Result Register for each Analog Input

• ±1 LSB Accuracy at 3.3V

• Single Supply Operation

• 4 Msps Conversion Rate at 3.3V (devices with two

SARs)

• 2 Msps Conversion Rate at 3.3V (devices with

one SAR)

• Low-Power CMOS Technology

22.2

Module 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 (PFC)

This ADC works with the High-Speed PWM module in

power control applications that require high-frequency

control loops. This module can Sample-and-Convert

two analog inputs in a 0.5 microsecond when two SARs

are used. This small conversion delay reduces the

“phase lag” between measurement and control system

response.

Up to five inputs may be sampled at a time (four inputs

from the dedicated sample and hold circuits and one

from the shared sample and hold circuit). 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.

The user application typically requires synchronization

between analog data sampling and PWM output to the

application 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

• Two Internal Inputs to Monitor the INTREF and

EXTREF Input Signals

Block diagrams of the ADC module for the family

devices are shown in Figure 22-1 through Figure 22-4.

Note 1: This data sheet summarizes the features

of the dsPIC33FJ32GS406/606/608/610

and

dsPIC33FJ64GS406/606/608/610

families of devices. It is not intended to

be a comprehensive reference source.

To complement the information in this

data sheet, refer to Section 44.

“High-Speed 10-Bit Analog-to-Digital

Converter (ADC)” (DS70321) in the

“dsPIC33F/PIC24H Family Reference

Manual”, which is available from the

Microchip web site (www.microchip.com).

2: Some registers and associated bits

described in this section may not be

available on all devices. Refer to

Section 4.0 “Memory Organization” in

this data sheet for device-specific register

and bit information.

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