MCP3465R datasheet(47/110 Pages) MICROCHIP

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DS20006414C-page 47

MCP3465R

5.7

Internal/External Voltage

Reference

5.7.1

VOLTAGE REFERENCE

SELECTION

The voltage reference selection for the ADC is

controlled by the VREF_SEL bit in the CONFIG0

The REFIN- pin is set as an input, directly connected to

the VREF- input of the ADC. For a better noise immu-

nity, it is recommended to connect this pin to AGND

externally when a single-ended voltage reference is

used. Figure 6-10 shows more details of the reference

selection and reference pins connections.

FIGURE 5-9:

Voltage Reference Selection Schematic.

TABLE 5-9:

ADC VOLTAGE REFERENCE SELECTION

VREF_SEL

Description

Reference Input/Output Pins

REFIN- Pin

REFIN+/OUT Pin

External reference selected.

Internal reference buffer is shut down.

Internal reference is only generating the

internal 1.2V Common-mode voltage for

the ADC.

VREF- Input

VREF+ Input

Internal reference selected with 2.4V

buffered output.

VREF- Input

(should be tied to AGND)

Internal reference with 2.4V

buffered output

REFIN+/OUT

PAD

REFIN-

PAD

1.2V

VCM Buffer

ADC VREF-

Input

–

Chopped at DMCLK Rate if AZ_VREF =

VREF_SEL =

0 Off

VREF_SEL =

1 On

ADC VREF+

Input

ADC Internal

VCM Voltage

–

Internal

Band Gap

Voltage

VREF_SEL

VREF Buffer

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