WM8753 Wolfson Microelectronics plc, WM8753 Datasheet - Page 30

• Manufacturer Part Number: WM8753
• Description: HI FI AND TELEPHONY DUAL CODEC
• Manufacturer: Wolfson Microelectronics plc

Advanced Information
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Table 18 ADC Signal Path Control
DIGITAL ADC VOLUME CONTROL
The output of the ADCs can be digitally amplified or attenuated over a range from –97dB to +30dB in
0.5dB steps. The volume of each channel can be controlled separately. The gain for a given eight-bit
code X is given by:
0.5
The LAVU and RAVU control bits control the loading of digital volume control data. When LAVU or
RAVU are set to 0, the LADCVOL or RADCVOL control data will be loaded into the respective control
register, but will not actually change the digital gain setting. Both left and right gain settings are
updated when either LAVU or RAVU are set to 1. This makes it possible to update the gain of both
channels simultaneously.
R2 (02h)
ADC Control
(X-195) dB for 1
REGISTER
ADDRESS
6:5
4
3:2
1
0
X
BIT
255;
ADCPOL
[1:0]
VXFILT
HPMODE
HPOR
ADCHPD
LABEL
MUTE for X = 0
00
0
00
0
0
DEFAULT
00 = Polarity not inverted
01 = L polarity invert
10 = R polarity invert
11 = L and R polarity invert
0 = HiFi Filter
1 = Voice FIlter
ADC High pass Filter Cut-off
Select
00 = 3.4Hz @ fs = 48kHz
01 = 82Hz @ fs = 16kHz
10 = 82Hz @ fs = 8kHz
11 = 170Hz @ fs = 8kHz
1 = store offset
0 = clear offset
ADC High Pass Filter Enable
(Digital)
1 = Disable High Pass Filter
0 = Enable High Pass Filter
ADC Filter Select
Store dc offset
(41Hz @ fs = 8kHz)
(164Hz @ fs = 16kHz)
(340Hz @ fs = 16kHz)
DESCRIPTION
AI Rev 3.1 June 2004
WM8753L
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