DSPIC30F5015 datasheet(144/234 Pages) MICROCHIP

144 / 234 page

dsPIC30F5015/5016

DS70149E-page 144

The configuration guidelines give the required setup

values for the conversion speeds above 500 ksps,

since they require external VREF pins usage and there

are some differences in the configuration procedure.

Configuration details that are not critical to the

conversion speed have been omitted.

The following figure depicts the recommended circuit

for the conversion rates above 500 ksps.

FIGURE 20-2:

ADC VOLTAGE REFERENCE SCHEMATIC

20.7.1

1 Msps CONFIGURATION

GUIDELINE

The configuration for 1 Msps operation is dependent on

whether a single input pin is to be sampled or whether

multiple pins will be sampled.

20.7.1.1

Single Analog Input

For conversions at 1 Msps for a single analog input, at

least two sample and hold channels must be enabled.

The analog input multiplexer must be configured so

that the same input pin is connected to both sample

and hold channels. The ADC converts the value held

on one S/H channel, while the second S/H channel

acquires a new input sample.

20.7.1.2

Multiple Analog Inputs

The ADC can also be used to sample multiple analog

inputs using multiple sample and hold channels. In this

case, the total 1 Msps conversion rate is divided among

the different input signals. For example, four inputs can

be sampled at a rate of 250 ksps for each signal or two

inputs could be sampled at a rate of 500 ksps for each

signal. Sequential sampling must be used in this con-

figuration to allow adequate sampling time on each

input.

VDD

0.1

μF

0.01

μF

1 mF

VDD

0.1 mF

VDD

0.01 mF

VDD

1 mF

VDD

0.1 mF

VDD

0.01 mF

dsPIC30F5015

MCLR

VSS

VDD

VREF-

VREF+

AVDD

VDD

VSS

VDD

DSPIC30F5015 Datasheet(PDF) 144 Page - Microchip Technology

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