MCP3464T-ESLASHST datasheet(77/108 Pages) MICROCHIP

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DS20006180D-page 77

MCP3461/2/4

7.0

BASIC APPLICATION

CONFIGURATION

The MCP3461/2/4 devices can be used for various

precision Analog-to-Digital Converter applications. The

flexibility of its usage is given by the possibility of

configuring the ADC to fit the required application.

7.1

Typical Application for Absolute

Voltage Measurement

One application of MCP3461/2/4 is to measure the

signal provided by the sensors with absolute voltage

output. For such applications, the MCP3461/2/4 will

rely on an external voltage reference. Figure 7-1

provides an example that uses the MCP3464 ADC with

MCP1501 external voltage reference. For best perfor-

mance, an RC filter and operational amplifier have

been placed between the OUT pin of the MCP1501

voltage reference and the REFIN+ input of the

MCP3464.

FIGURE 7-1:

MCP3464 Application Example Schematic.

The ADC can be used either in differential or

Single-Ended mode, thanks to the internal dual

multiplexer (Figure 5-1). The user can select the input

connection

settings

from

the

MUX

(Section 8.7 “MUX Register”) by using the different

settings available on the positive and negative inputs of

the ADC. The single-ended configuration is achieved

by selecting AGND for the VIN- input of the ADC

(MUX[3:0] = 1000) or by selecting any CHn input chan-

nel for VIN- and connecting the corresponding CHn

input channel to AGND.

7.1.1

HIGH-SIDE AND LOW-SIDE

CURRENT SENSING

The ADC has the ability to perform differential

measurements with analog input Common-mode equal

to or slightly larger than AVDD, or equal to or slightly lower

than AGND (see the Electrical Characteristics table).

The user must use a differential input structure and

Kelvin connection to achieve the most accurate

measurements. An anti-aliasing filter is required to

avoid aliasing of the oversampling frequency (DMCLK)

back into the baseband of the input signal and possible

corruption of the output data. Figure 7-1 provides an

example of an anti-aliasing filter.

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