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WM8978GEFL/V Datasheet(PDF) 57 Page - Wolfson Microelectronics plc

No. de pieza WM8978GEFL/V
Descripción Electrónicos  Stereo CODEC With Speaker Driver
PDF  119 Pages
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8978GEFL/V Datasheet(HTML) 57 Page - Wolfson Microelectronics plc

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Pre-Production
WM8978
w
PP Rev 3.0 May 2006
57
6:4
LIMLVL
000
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 32 DAC Digital Limiter Control
5-BAND GRAPHIC EQUALISER
A 5-band graphic equaliser (EQ) 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
EQ Control 1
8
EQ3DMODE
1
0 = Equaliser and 3D Enhancement
applied to ADC path
1 = Equaliser and 3D Enhancement
applied to DAC path
Table 33 EQ and 3D Enhancement 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 39 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 34 EQ Band 1 Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
4:0
EQ2G
01100
(0dB)
Band 2 Gain Control. See Table 39 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 35 EQ Band 2 Control



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