WM8983_10 Datasheet, PDF (43/124 Pages) Wolfson Microelectronics plc – Mobile Multimedia CODEC with 1W Speaker Driver

Production Data
WM8983
DIGITAL ADC VOLUME CONTROL
The output of the ADCs can be digitally attenuated over a range from –127dB to 0dB in 0.5dB steps.
The gain for a given eight-bit code X is given by:
0.5 × (G-255) dB for 1 ≤ G ≤ 255;
MUTE for G = 0
REGISTER
ADDRESS
R15
Left channel
ADC Digital
Volume
BIT
LABEL
7:0 ADCLVOL
[7:0]
8
ADCVU
R16
7:0 ADCRVOL
Right channel
[7:0]
ADC Digital
Volume
8
ADCVU
Table 18 ADC Digital Volume Control
DEFAULT
11111111
( 0dB )
Not
latched
11111111
( 0dB )
Not
latched
DESCRIPTION
Left ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
… 0.5dB steps up to
1111 1111 = 0dB
ADC left and ADC right volume do not
update until a 1 is written to ADCVU (in
reg 15 or 16)
Right ADC Digital Volume Control
0000 0000 = Digital Mute
0000 0001 = -127dB
0000 0010 = -126.5dB
... 0.5dB steps up to
1111 1111 = 0dB
ADC left and ADC right volume do not
update until a 1 is written to ADCVU (in
reg 15 or 16)
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PD, Rev 4.3, May 2010
43