DSPIC33FJ06GS201TESLASHMM datasheet(239/346 Pages) MICROCHIP

239 / 346 page

Preliminary

DS70318D-page 237

dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04

19.0

HIGH-SPEED 10-BIT

ANALOG-TO-DIGITAL

CONVERTER (ADC)

The

dsPIC33FJ06GS101/X02

and

dsPIC33FJ16GSX02/X04 devices provide high-speed

successive approximation analog to digital conversions to

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

converters.

19.1

Features Overview

The ADC module comprises the following features:

• 10-bit resolution

• Unipolar inputs

• Up to two Successive Approximation Registers

(SARs)

• Up to 12 external input channels

• Up to 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

19.2

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

sample 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 1.2V internal

reference and EXTREF input signal

A block diagram of the ADC module is shown in

Figure 19-6.

Note:

This data sheet summarizes the features

the

dsPIC33FJ06GS101/X02

and

dsPIC33FJ16GSX02/X04

families

devices. It is not intended to be a

comprehensive reference source. To

complement the information in this data

sheet, refer to the “dsPIC33F Family

Reference

Manual”

Section

44.

“High-Speed 10-Bit Analog-to-Digital

Converter (ADC)”

(DS70321), which is

available on the Microchip web site

(www.microchip.com).

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