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WM8974 Datasheet(PDF) 31 Page - Wolfson Microelectronics plc

Part # WM8974
Description  MONO CODEC WITH SPEAKER DRIVER
PDF  63 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8974 Datasheet(HTML) 31 Page - Wolfson Microelectronics plc

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WM8974
w
PP Rev 1.1 September 2004
31
GRAPHIC EQUALISER
A 5-band graphic EQ is provided, which can be applied to the ADC or DAC path under control of the
EQMODE register bit.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R18
EQ Control 1
8
EQMODE
1
0 = Equaliser applied to ADC path
1 = Equaliser applied to DAC path
Table 12 EQ DAC or ADC Path Select
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
DEFAULT
DESCRIPTION
4:0
EQ1G
01100
(0dB)
Band 1 Gain Control. See Table 18 for
details.
R18
EQ Band 1
Control
6:5
EQ1C
01
Band 1 Cut-off Frequency:
00=80Hz
01=105Hz
10=135Hz
11=175Hz
Table 13 EQ Band 1 Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
4:0
EQ2G
01100
(0dB)
Band 2 Gain Control. See Table 18 for
details.
6:5
EQ2C
01
Band 2 Centre Frequency:
00=230Hz
01=300Hz
10=385Hz
11=500Hz
R19
EQ Band 2
Control
8
EQ2BW
0
Band 2 Bandwidth Control
0=narrow bandwidth
1=wide bandwidth
Table 14 EQ Band 2 Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
4:0
EQ3G
01100
(0dB)
Band 3 Gain Control. See Table 18 for
details.
6:5
EQ3C
01
Band 3 Centre Frequency:
00=650Hz
01=850Hz
10=1.1kHz
11=1.4kHz
R20
EQ Band 3
Control
8
EQ3BW
0
Band 3 Bandwidth Control
0=narrow bandwidth
1=wide bandwidth
Table 15 EQ Band 3 Control



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