WM8602SEDSSLASHV datasheet(27/46 Pages) WOLFSON

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WM8602

PP Rev 1.5 May 2004

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R17 (11h)

EQ Band 3

Gain Control

3:0

EQ3GF

[3:0]

1111

(Disabled)

Band 3 Left/Right Gain

0000 or 0001 = +9dB

0010 = +7.5dB

… (1.5dB steps)

1011 to 1110 = -6dB

1111 = Disable

Table 27 EQ Band 3 Gain Control

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

EQ1CF

Band 1 Left/Right Centre-Frequency

0 = High Cutoff (500Hz)

1 = Low Cutoff (250Hz)

EQ2CF

Band 2 Left/Right Centre-Frequency

0 = High Cutoff (2kHz)

1 = Low Cutoff (1kHz)

R18 (12h)

EQ Centre-

Frequency

Control

EQ3CF

Band 3 Left/Right Cutoff Frequency

0 = High Cutoff (8kHz)

1 = Low Cutoff (4kHz)

Table 28 EQ Frequency Control

Band 0 is controlled via the sub-woofer volume control register R11 as described in Table 31. The

functionality to add/subtract the boost/cut setting to the sub-woofer volume must be written into the

software controller for the chip.

The Band 0 Cutoff frequency can be changed using the corner frequency of the low-pass/high-pass

filters as described in Table 23.

DIGITAL LOUDSPEAKER EQUALISER

A loudspeaker equaliser is provided to compensate for high-frequency variations that can occur when

loudspeakers of different impedances are used with different output filters in typical output stages.

The equaliser has selectable cut-off frequencies which are independent of sample rate. The gain at

20kHz is controllable in 0.5dB steps from -1.5dB to +2dB via the LSEQ control bit. The settings are

applied to Left and Right channels simultaneously.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LSCO

LSEQ Filter Characteristic

0 = High Cutoff (15kHz)

1 = Low Cutoff (10kHz)

R19 (13h)

Loudspeaker

Equaliser

3:1

LSEQ

[2:0]

100

(Disabled)

High Frequency Equalisation

000 = +2dB

001 = +1.5dB

010 = +1dB

011 = +0.5dB

100 = Disable

101 = -0.5dB

110 = -1dB

111 = -1.5dB

Table 29 Loudspeaker Equaliser

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