WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 59

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

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Table 24 DAC Digital Limiter Control
5-BAND GRAPHIC EQUALISER
Table 25 EQ and 3D Enhancement DAC or ADC Path Select
Table 26 EQ Band 1 Control
Table 27 EQ Band 2 Control
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.
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.
R18 (12h)
EQ Control 1
R18 (12h)
EQ Band 1
Control
R19 (13h)
EQ Band 2
Control
REGISTER
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
ADDRESS
6:4
8
4:0
6:5
4:0
6:5
8
BIT
BIT
BIT
BIT
LIMLVL
EQ3DMODE
EQ1G
EQ1C
EQ2G
EQ2C
EQ2BW
LABEL
LABEL
LABEL
LABEL
000
1
01100
(0dB)
01
01100
(0dB)
01
0
DEFAULT
DEFAULT
DEFAULT
DEFAULT
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
0 = Equaliser and 3D Enhancement
applied to ADC path
1 = Equaliser and 3D Enhancement
applied to DAC path
Band 1 Gain Control. See Table 31 for
details.
Band 1 Cut-off Frequency:
00 = 80Hz
01 = 105Hz
10 = 135Hz
11 = 175Hz
Band 2 Gain Control. See Table 31 for
details.
Band 2 Centre Frequency:
00 = 230Hz
01 = 300Hz
10 = 385Hz
11 = 500Hz
Band 2 Bandwidth Control
0 = narrow bandwidth
1 = wide bandwidth
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
PP, Rev 3.5, January 2007
WM8985
59