DSPIC30F2010 datasheet(142/236 Pages) MICROCHIP

142 / 236 page

dsPIC30F6010A/6015

DS70150C-page 140

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:

A/D CONVERTER 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 A/D 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 A/D converter 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 configuration to allow adequate sampling

time on each input.

VSS

VDD

VSS

dsPIC30F6010A

VDD

0.1

μF

0.01

μF

VDD

0.1

μF

VDD

0.01

μF

VDD

μF

VDD

0.1

μF

VDD

0.01

μF

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