MCP37231 datasheet(44/144 Pages) MICROCHIP

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MCP37231/21-200 AND MCP37D31/21-200

DS20005322D-page 44

 2014-2016 Microchip Technology Inc.

4.5.2.1

SENSE Selection Vs. SNR/SFDR

Performance

The SENSE pin is used to configure the full-scale input

range of the ADC. Depending on the application

conditions, the SNR, SFDR and dynamic range

performance are affected by the SENSE pin

configuration. Table 4-3 summarizes these settings.

• High-Reference Mode

This mode is enabled by setting the SENSE pin to

AVDD12 (1.2V). This mode provides the highest input

full-scale range (2.975 VP-P) and the highest SNR

performance. Figure 3-17 and Figure 3-20 show

SNR/SFDR versus input amplitude in High-Reference

mode.

• Low-Reference Mode

This mode is enabled by setting the SENSE pin to

ground. This mode is suitable for applications which have

a smaller input full-scale range. This mode provides

improved SFDR characteristics, but SNR is reduced by

-6 dB compared to the High-Reference Mode.

• SENSE Mode

This mode is enabled by driving the SENSE pin with an

external voltage source between 0.4V and 0.8V. This

mode allows the user to adjust the input full-scale

range such that SNR and dynamic range are optimized

in a given application system environment.

TABLE 4-3:

SENSE VS. SNR/SFDR PERFORMANCE

SENSE

Descriptions

High-Reference Mode

(SENSE pin = AVDD12)

High-input full-scale range (2.975 VP-P) and optimized SNR

Low-Reference Mode

(SENSE pin = ground)

Low-input full-scale range (1.4875 VP-P) and reduced SNR, but optimized SFDR

Sense Mode

(SENSE pin = 0.4V to 0.8V)

Adjustable-input full-scale range (1.4875 VP-P - 2.975 VP-P). Dynamic trade-off

between High-Reference and Low-Reference modes can be used.

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