MCP3564-ESLASHST datasheet(77/108 Pages) MICROCHIP

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DS20006181C-page 77

MCP3561/2/4

7.0

BASIC APPLICATION

CONFIGURATION

The MCP3561/2/4 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

The MCP3561/2/4 is able to measure the signal

provided by sensors with absolute voltage output. For

such applications, the MCP3561/2/4 will rely on an

external voltage reference. Figure 7-1 provides an

example that uses the MCP3564 ADC with the

MCP1501 external voltage reference. For best perfor-

mances, an RC filter and operational amplifier have

been placed between the OUT pin of the MCP1501

voltage reference and the REFIN+ input of the

MCP3564. The op amp is necessary because the

REFIN+ input is not buffered.

FIGURE 7-1:

MCP3564 Application Example.

The ADC can be used in Differential or Single-Ended

mode due to the internal dual multiplexer (Figure 5-1).

The user can select the input connection settings from

the MUX register (Section 8.7 “Multiplexer (MUX)

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 channel for VIN- and

connecting the corresponding CHn input channel to

AGND.

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