WM8994 Datasheet, PDF (66/359 Pages) Wolfson Microelectronics plc – Multi-Channel Audio Hub CODEC for Smartphones

WM8994
REGISTER
BIT
ADDRESS
LABEL
R1536 (0600h) 8:5 ADCR_DAC1_V
DAC1 Mixer
OL [3:0]
Volumes
3:0 ADCL_DAC1_V
OL [3:0]
R1539 (0603h) 8:5 ADCR_DAC2_V
DAC2 Mixer
OL [3:0]
Volumes
3:0 ADCL_DAC2_V
OL [3:0]
R1569 (0621h) 9:7 ST_HPF_CUT
Sidetone
[2:0]
6
ST_HPF
Table 18 Digital Sidetone Volume Control
DEFAULT
Production Data
DESCRIPTION
0000
0000
0000
0000
000
0
Sidetone STR to DAC1L and
DAC1R Volume
0000 = -36dB
0001 = -33dB
…. (3dB steps)
1011 = -3dB
1100 = 0dB
(see Table 19 for gain range)
Sidetone STL to DAC1L and
DAC1R Volume
0000 = -36dB
0001 = -33dB
…. (3dB steps)
1011 = -3dB
1100 = 0dB
(see Table 19 for gain range)
Sidetone STR to DAC2L and
DAC2R Volume
0000 = -36dB
0001 = -33dB
…. (3dB steps)
1011 = -3dB
1100 = 0dB
(see Table 19 for gain range)
Sidetone STL to DAC2L and
DAC2R Volume
0000 = -36dB
0001 = -33dB
…. (3dB steps)
1011 = -3dB
1100 = 0dB
(see Table 19 for gain range)
Sidetone HPF cut-off frequency
(relative to 44.1kHz sample rate)
000 = 2.7kHz
001 = 1.35kHz
010 = 675Hz
011 = 370Hz
100 = 180Hz
101 = 90Hz
110 = 45Hz
111 = Reserved
Note - the cut-off frequencies scale
with the Digital Mixing (SYSCLK)
clocking rate. The quoted figures
apply to 44.1kHz sample rate.
Digital Sidetone HPF Select
0 = Disabled
1 = Enabled
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PD, April 2012, Rev 4.4
66