Datasheet

ADS131E04

ADS131E06

ADS131E08

SBAS561A –JUNE 2012–REVISED APRIL 2013

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CONFIG3: Configuration Register 3

Address = 03h

BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

PDB_REFBUF 1 VREF_4V 0 OPAMP_REF PDB_OPAMP 0 0

This register configures the multireference operation.

Bit 7 PDB_REFBUF: Power-down reference buffer

This bit determines the power-down reference buffer state.

0 = Power-down internal reference buffer (default)

1 = Enable internal reference buffer

Bit 6 Must be set to '1'

Default is '1' at power-up.

Bit 5 VREF_4V: Reference voltage

This bit determines the reference voltage, VREFP.

0 = VREFP is set to 2.4 V (default)

1 = VREFP is set to 4 V (use only with a 5-V analog supply)

Bit 4 Must be set to '0'

Bit 3 OPAMP_REF: Op amp reference

This bit determines whether the op amp noninverting input connects to the OPAMPP pin or to the internally-derived 1/2

supply (AVDD + AVSS) / 2.

0 = Noninverting input connected to the OPAMPP pin (default)

1 = Noninverting input connected to (AVDD + AVSS) / 2

Bit 2 PDB_OPAMP: Op amp power down

This bit determines the power-down reference buffer state.

0 = Power-down op amp (default)

1 = Enable op amp

Bits[1:0] Must be set to '0'

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