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WM8955LEFL 데이터시트(PDF) 17 Page - Wolfson Microelectronics plc

부품명 WM8955LEFL
상세설명  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955LEFL 데이터시트(HTML) 17 Page - Wolfson Microelectronics plc

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Product Preview
WM8955L
w
Product Preview Rev 0.4 May2003
17
TONE CONTROL
The WM8955L provides separate controls for bass and treble with programmable gains and filter
characteristics. This function operates on digital audio data before it is passed to the audio DACs.
Bass control can take two different forms:
•
Linear bass control: bass signals are amplified or attenuated bya user programmable
gain. This is independent of signal volume, and veryhigh bass gains on loud signals
maylead to signal clipping.
•
Adaptive bass boost: The bass volume is amplified bya variable gain. When the bass
volume is low, it is boosted more than when the bass volume is high. This method is
recommended because it prevents clipping, and usuallysounds more pleasant to the
human ear.
Treble control applies a user programmable gain, without anyadaptive boost function.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
7BB
0
Bass Mode
0 = Linear bass control
1 = Adaptive bass boost
6
BC
0
Bass Filter Characteristic
0 = Low Cutoff (130 Hz at 48kHz sampling)
1 = High Cutoff (200 Hz at 48kHz sampling)
Bass Intensity
Code
BB=0
BB=1
0000
+9dB
15 (max)
0001
+9dB
14
0010
+7.5dB
13
…
(1.5dB steps)
…
0111
0dB
8
…
(1.5dB steps)
…
1011-1101
-6dB
4-2
1110
-6dB
1 (min)
R12 (0Ch)
Bass Control
3:0
BASS
1111 (OFF)
1111
Bypass (OFF)
6
TC
0
Treble Filter Characteristic
0 = High Cutoff (8kHz at 48kHz sampling)
1 = Low Cutoff (4kHz at 48kHz sampling)
R13 (0Dh)
Treble Control
3:0
TRBL
1111
(Disabled)
Treble Intensity
0000 or 0001 = +9dB
0010 = +7.5dB
… (1.5dB steps)
1011 to 1110 = -6dB
1111 = Disable
Table 3 Tone Control
Note:
1.
All cut-off frequencies change proportionallywith the DAC sample rate.



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