Pre-Production
WM8985
REGISTER
ADDRESS
BIT
LABEL
LIMLVL
DEFAULT
000
DESCRIPTION
6:4
Programmable signal threshold level
(determines level at which the limiter
starts to operate)
000 = -1dB
001 = -2dB
010 = -3dB
011 = -4dB
100 = -5dB
101 to 111 = -6dB
Table 24 DAC Digital Limiter Control
5-BAND GRAPHIC EQUALISER
A 5-band graphic equaliser is provided, which can be applied to the ADC or DAC path, together with
3D enhancement, under control of the EQ3DMODE register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R18 (12h)
8
EQ3DMODE
1
0 = Equaliser and 3D Enhancement
applied to ADC path
EQ Control 1
1 = Equaliser and 3D Enhancement
applied to DAC path
Table 25 EQ and 3D Enhancement DAC or ADC Path Select
Note: The ADCs and DACs must be disabled before changing the EQ3DMODE bit.
The equaliser consists of low and high frequency shelving filters (Band 1 and 5) and three peak
filters for the centre bands. Each has adjustable cut-off or centre frequency, and selectable boost
(+/- 12dB in 1dB steps). The peak filters have selectable bandwidth.
REGISTER
ADDRESS
BIT
LABEL
EQ1G
EQ1C
DEFAULT
DESCRIPTION
R18 (12h)
EQ Band 1
Control
4:0
01100
(0dB)
01
Band 1 Gain Control. See Table 31 for
details.
6:5
Band 1 Cut-off Frequency:
00 = 80Hz
01 = 105Hz
10 = 135Hz
11 = 175Hz
Table 26 EQ Band 1 Control
REGISTER
ADDRESS
BIT
LABEL
EQ2G
DEFAULT
DESCRIPTION
R19 (13h)
EQ Band 2
Control
4:0
01100
(0dB)
01
Band 2 Gain Control. See Table 31 for
details.
6:5
EQ2C
Band 2 Centre Frequency:
00 = 230Hz
01 = 300Hz
10 = 385Hz
11 = 500Hz
8
EQ2BW
0
Band 2 Bandwidth Control
0 = narrow bandwidth
1 = wide bandwidth
Table 27 EQ Band 2 Control
PP, Rev 3.4, October 2006
59
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
