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WM8352 Datasheet(PDF) 72 Page - Wolfson Microelectronics plc

Part # WM8352
Description  Wolfson AudioPlus™ Stereo CODEC with Power Management
PDF  336 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8352 Datasheet(HTML) 72 Page - Wolfson Microelectronics plc

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WM8352
Production Data
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PD, February 2011, Rev 4.4
72
13.5.1
ADC VOLUME CONTROL
Programmable digital volume control is provided to attenuate the ADC’s output signal.
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R66 (42h)
ADC Digital
Volume L
8
ADC_VU
0
ADC left and ADC right volume do not update
until a 1 is written to either ADC_VU register
bit.
7:0
ADCL_VO
L [7:0]
1100_000
0
Left ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -71.625dB
0000 0010 = -71.25dB
... 0.375dB steps up to
1110 1111 = +17.625dB
R67 (43h)
ADC Digital
Volume R
8
ADC_VU
0
ADC left and ADC right volume do not update
until a 1 is written to either ADC_VU register
bit.
7:0
ADCR_VO
L [7:0]
1100_000
0
Right ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -71.625dB
0000 0010 = -71.25dB
... 0.375dB steps up to
1110 1111 = +17.625dB
Table 27 ADC Volume Control
13.5.2
ADC HIGH-PASS FILTER
A digital high-pass filter is provided to remove DC offsets from the ADC signal.
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R11 (0Bh)
Power
Mgmt 4
13
ADC_HPF_EN
A
0
High Pass Filter enable
0 = disabled
1 = enabled
R64 (40h)
ADC
Control
15
9:8
ADC_HPF_CU
T [1:0]
00
Select cut-off frequency for high-pass filter
00 = 2^-11 (first order) = 3.7Hz @
fs=44.1kHz
01 = 2^-5 (2nd order) = ~250Hz @ fs=8kHz
10 = 2^-4 (2nd order) = ~250Hz @ fs=16kHz
11 = 2^-3 (2nd order) = ~250Hz @ fs=32kHz
Note: ADC_HPF_ENA can be accessed through R11 or through R64. Reading from or writing to
either register location has the same effect.
Table 28 Controlling the ADC High-pass Filter



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