WM9712CLGEFLSLASHV datasheet(28/78 Pages) WOLFSON

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WM9712L

Production Data

PD, Rev 4.6, November 2011

AUXILIARY DAC

AUXDAC is a simple 12-bit mono DAC. It can be used to generate DC signals (with the numeric input

written into a control register), or AC signals such as telephone-quality ring tones or system beeps

(with the input signal supplied through an AC-Link slot). In AC mode (XSLE = 1), the input data is

binary offset coded; in DC mode (XSLE = 0), there is no offset.

The analogue output of AUXDAC is routed directly into the output mixers. The signal gain into each

mixer can be adjusted at the mixer inputs using control register 12h. In slot mode (XSLE = 1), the

AUXDAC also supports variable sample rates (See “Variable Rate Audio” section).

When the auxiliary DAC is not used, it can be powered down by setting AXE = 0. This is also the

default setting.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

64h

AUDAC Input

Control

XSLE

AUXDAC input selection

0: from AUXDACVAL (for DC signals)

1: from AC-Link slot selected by

AUXDACSLT (for AC signals)

14:12

AUXDAC

SLT

000

AUXDAC Input Selection

000 – Slot 5, bits 8-19 (with XSLE=1)

001 – Slot 6, bits 8-19 (with XSLE=1)

010 – Slot 7, bits 8-19 (with XSLE=1)

011 – Slot 8, bits 8-19 (with XSLE=1)

100 – Slot 9, bits 8-19 (with XSLE=1)

101 – Slot 10, bits 8-19 (with XSLE=1)

110 – Slot 11, bits 8-19 (with XSLE=1)

111 – RESERVED (do not use)

11:0

AUXDAC

VAL

000h

AUXDAC Digital Input (with XSLE=0)

000h: minimum

FFFh: full-scale

12h

AUXDAC Output

Control

A2H

Mute AUXDAC path to headphone

mixer

1: Mute, 0: No mute (ON)

14:12

A2HVOL

010

(0dB)

AUXDAC to headphone mixer gain

000: +6dB

… (3dB steps)

111: -15dB

A2S

Mute AUXDAC path to speaker mixer

1: Mute, 0: No mute (ON)

10:8

A2SVOL

010

(0dB)

AUXDAC to speaker mixer gain

000: +6dB

… (3dB steps)

111: -15dB

A2P

Mute AUXDAC path to phone mixer

1: Mute, 0: No mute (ON)

6:4

A2PVOL

010

(0dB)

AUXDAC to phone mixer gain

000: +6dB

… (3dB steps)

111: -15dB

AXE

0: AUXDAC off

1: AUXDAC enabled

Table 14 AUXDAC Control

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