WM8602SEDSSLASHV datasheet(33/46 Pages) WOLFSON

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WM8602

PP Rev 1.5 May 2004

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

ATK[2:0]

010

Sub Channel Attack Rate

000 = 170µs

001 = 330µs

010 = 670µs

011 = 1.33ms

100 = 2.67ms

101 = 5.33ms

110 = 10.7ms

111 = 20.1ms

5:3

DCY[2:0]

011

Sub Channel Decay Rate

000 = 340ms

001 = 680ms

010 = 1.36s

011 = 2.73s

100 = 5,46s

101, 110, 111 = 10.9s

7:6

THRESH[1:0]

Sub Channel Compressor Thresholds

00 = -12dB

01 = -9dB

10 = -6dB

11 = -3dB

R24 (18h)

Sub Channel

Dynamic

Peak

Compressor

FDEP

Frequency-dependent decay

0 = disable

1 = enable

Table 38 Subwoofer Channel Dynamic Peak Compressor (2)

ZERO-CROSS DETECT

The Dynamic Peak Compressor has a zero-cross detect which minimises clicks during gain changes.

The zero-cross detect can be enabled/disabled for Left/Right or Subwoofer channels. The zero-cross

has a timeout feature which ensures that the volume will change even if the input has a large DC

offset. Once a new gain has been requested from the Dynamic Peak Compressor, the zero-cross

detector will wait for a zero-cross for 25 to 50 ms before applying the gain change.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

ZCF

Zero-Cross Enable – Left/Right

Channels:

0 : Disable Zero-Cross

Enable Zero-Cross

ZCSUB

Zero-Cross Enable – Sub Channel:

0 : Disable Zero-Cross

Enable Zero-Cross

R25 (19h)

Volume

Control Zero-

Cross

ZCT

Zero Cross Timeout Enable:

0 : Disable Zero-Cross Timeout

Enable Zero-Cross Timeout

Table 39 Volume Control Zero-Cross

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