DACREF datasheet(10/30 Pages) ATMEL

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AVR32768

32157A-AVR-12/10

Table 7-2.

ADC single-ended external voltage reference, 3.3V power supply mode.

Signal name

Recommended pin connection

Description

ADCREF0

1.0V to 2.6V

Single-ended external voltage reference

ADCREF1

1.0V to 2.6V

Single-ended external voltage reference

Figure 7-2.

Single-ended external reference, 5V power supply mode.

ADCREF0

ADCREF1

DC/DC

converter

1.0 to 3.5 V

DC/DC

converter

1.0 to 3.5 V

Table 7-3.

ADC single-ended external voltage reference, 5V power supply mode.

Signal name

Recommended pin connection

Description

ADCREF0

1.0V to 3.5V

Single-ended external voltage reference

ADCREF1

1.0V to 3.5V

Single-ended external voltage reference

7.2.2 ADC differential external reference pins (ADCVREFP/ADCVREFN)

In order to use the internal 1V bandgap reference, the ADCVREFP and ADCVREFN

pins must be used with decoupling capacitors (see Figure 7-3 and Table 7-5 for

typical values).

If the internal voltage reference is unused, ADCVREFP and ADCVREFN can be used

as differential external voltage reference (see Figure 7-4 and Table 7-5).

Figure 7-3.

ADCVREFP/ADCVREFN external decoupling for use of internal bandgap

reference.

Table 7-4.

ADC differential external voltage reference, internal reference used.

Signal name

Recommended pin connection

Description

ADCVREFP

Positive differential voltage

Differential external voltage reference

ADCVREFN

Negative differential voltage

Differential external voltage reference

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