MCP3460RT-ESLASH2LX datasheet(75/103 Pages) MICROCHIP

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DS20006975A page 75

MCP3460R

7.0

BASIC APPLICATION

CONFIGURATION

The MCP3460R device can be used for various

precision

Analog-to-Digital

Converter

(ADC)

applications. The flexibility of its use comes from the

ability to configure the ADC to meet specific application

requirements.

7.1

Typical Application for Absolute

Voltage Measurement

The MCP3460R device is able to measure the signal

provided by sensors with absolute voltage output. For

such applications, MCP3460R typically uses its internal

voltage reference. For optimal performance, Microchip

recommends to connect an external capacitor on the

REFIN+/OUT pin to filter noise and to provide more sta-

bility for the internal voltage reference (See

Section 3.1 “Differential Reference Voltage Inputs:

REFIN+/OUT, REFIN-”).

The ADC can operate in Differential or Single-Ended

mode thanks to its internal dual multiplexer (see

Figure 5-1). Select the input connection settings from

the MUX register (see Section 8.7 “MULTIPLEXER

(MUX) REGISTER”) by using the different settings

available on the positive and negative ADC inputs. To

achieve the single-ended configuration, select AGND

for the VIN- ADC input (MUX[3:0] = 1000) or select any

CHn input channel for VIN- and then connect the

corresponding CHn input channel to AGND.

7.1.1

HIGH-SIDE AND LOW-SIDE

CURRENT SENSING

The ADC can perform differential measurements with an

analog input Common-mode equal to or slightly larger

than AVDD or equal to or slightly lower than AGND (see

Section 1.0 “Electrical Characteristics”).

To achieve the most accurate measurements requires

a differential input structure and a Kelvin connection.

Using an anti-aliasing filter avoids aliasing of the over-

sampling 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.

To measure voltages that can reach AVDD or a few mV

higher, use a gain setting of 0.33x since it increases the

input range to a value of 3 x VREF. With this gain setting,

a 1.2V VREF allows a theoretical input range of 3.6V.

However, to limit excess leakage current at the input

pins created by ESD structures, the maximum measur-

able voltage is always bounded by AVDD + 0.1V. There-

fore, to properly measure 3.6V with a 1.2V voltage

reference, Microchip recommends using an AVDD

supply voltage as close as possible to 3.6V.

FIGURE 7-1:

MCP3460R Application Example.

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