ADuC7023BCBZ62I-R7 datasheet(36/96 Pages) AD

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ADuC7023

Data Sheet

| Page 36 of 96

BAND GAP REFERENCE

The ADuC7023 provides an on-chip band gap reference of

2.5 V, which can be used for the ADC and DAC. This internal

reference also appears on the VREF pin. When using the internal

reference, a 0.47 μF capacitor must be connected from the external

VREF pin to AGND to ensure stability and fast response during

ADC conversions. This reference can also be connected to an

external pin (VREF) and used as a reference for other circuits in

the system.

An external buffer is required because of the low drive capability

of the VREF output. A programmable option also allows an

external reference input on the VREF pin.

REFCON Register

Name:

REFCON

Address:

0xFFFF048C

Default value:

0x00

Access:

Read/write

Function:

The band gap reference interface consists

of an 8-bit MMR REFCON described in

Table 30.

Table 30. REFCON MMR Bit Designations

Bit

Description

7 to 1

Reserved.

Internal reference output enable.

This bit is set by the user to connect the internal 2.5 V

reference to the VREF pin. The reference can be used

for an external component but needs to be buffered.

This bit is cleared by the user to disconnect the

reference from the VREF pin.

To connect an external reference source to the ADuC7023,

configure REFCON = 0x01. ADC and the DACs can be

configured to use the same or different reference resource. See

Table 42.

Rev. E

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