WM8602SEDSSLASHV datasheet(25/46 Pages) WOLFSON

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WM8602

PP Rev 1.5 May 2004

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3 (03h)

Input/Output

Configuration

OPCFG[1:0]

Output Configuration

0 = Stereo

1 = 2.1

Table 22 Input and Output Configuration Register

The WM8602 also supports Stereo input – Stereo output via the Bass Management filtering

options, as discussed in Bass Management (page 25). In this case, the output configuration is

set to 2.1.

Where there are a different number of input and output channels, the data is processed as follows.

Refer to the section on Bass Management (page 25) for details on how the sub-channel is created.

STEREO INPUT – STEREO OUTPUT

The Left and Right inputs are passed to the Left and Right Outputs. All other channels are muted.

STEREO INPUT – 2.1 OUTPUT

The Left and Right inputs are passed to the Left and Right outputs. The low-frequency contents of

the Left and Right inputs, may be optionally mixed and passed to the SUB output.

BASS MANAGEMENT

The Bass-Management function filters and combines the input signals to produce a low-pass filtered

output for the sub-woofer channel and high-pass filtered outputs for the remaining channels. The

filters have selectable cut-off frequencies to match different types of sub-woofer and satellite

speakers. The filters are designed so that the cut-off frequencies for the high-pass and low-pass

filters remain constant irrespective of the sampling frequency used. 1

st order filters are used for the

low-pass and high-pass filters.

Figure 19 Bass Management

The high-pass filters pairs can be bypassed to allow full-range speakers to be used on the main

output pair.

The Bass-Management also provides a selectable LFE boost of 10dB via the LFEBOOST control bit.

Additional gain-adjust is provided after this block (refer to Digital Volume Control, page 28).

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