WM8602SEDSSLASHRV datasheet(29/46 Pages) WOLFSON

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WM8602

PP Rev 1.5 May 2004

VOLXX[7:0]

VOLUME LEVEL

00(hex)

-∞dB (mute)

01(hex)

-103dB

CF(hex)

0dB

FE(hex)

+23.5dB

FF(hex)

+24dB

Table 32 Volume Control Levels

DUAL VOLUME CONTROL

Setting the DVC register bit causes the volume settings to be applied in pairs. For example, the

DVCF causes the Left channel volume settings to be applied to both the Left and Right channels

from the next audio input sample. No update to the VOL registers is required for DVC to take effect.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R11 (0Bh)

Dual Volume

Control

DVCF

Dual Volume Control – Left/Right

Channels:

0 : Use VOLFR setting for Right

channel

Apply VOLFL setting to Right

channel

Table 33 Dual Volume Control

SOFT MUTE AND AUTO-MUTE

The WM8602 has a Soft Mute function set by the SMUTE control bit. Figure 20 shows the application

and release of SMUTE while a full amplitude sinusoid is being played at 48kHz sampling rate. When

SMUTE (lower trace) is asserted, the output (upper trace) begins to decay exponentially from the DC

level of the last input sample. The output will decay towards zero with a time constant of

approximately 64 input samples. When SMUTE is turned off, the output will restart almost

immediately from the current input sample, thus possibly causing a pop sound.

This function is disabled by default.

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