wm8987 Wolfson Microelectronics plc, wm8987 Datasheet - Page 32

• Manufacturer Part Number: wm8987
• Description: Stereo Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8987L
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Table 23 Right Output Mixer Control
The mono mixer differs from the left and right mixers in that the signal from each DAC into the mono
mixer is attenuated by 6dB. This is to prevent overloading when left and right DAC signals are mixed
to mono. When driving a BTL headset as shown in Figure 46, MONOVOL should be set 6dB higher
than the other output gains, in order to compensate for the 6dB attenuation at the mono mixer.
Table 24 Mono Mixer Control
R36 (24h)
Right Mixer
Control (1)
R37 (25h)
Right Mixer
Control (2)
R38 (26h)
Mono Mixer
Control (1)
R39 (27h)
Mono Mixer
Control (2)
REGISTER
REGISTER
ADDRESS
ADDRESS
8
7
6:4
8
7
6:4
8
7
6:4
8
7
6:4
BIT
BIT
LD2RO
LI2RO
LI2ROVOL
[2:0]
RD2RO
RI2RO
RI2ROVOL
[2:0]
LD2MO
LI2MO
LI2MOVOL
[2:0]
RD2MO
RI2MO
RI2MOVOL
[2:0]
LABEL
LABEL
0
0
101
(-9dB)
0
0
101
(-9dB)
DEFAULT
0
0
101
(-9dB)
0
0
101
(-9dB)
DEFAULT
Left DAC to Right Mixer
0 = Disable (Mute)
1 = Enable Path
LMIXSEL Signal to Right Mixer
0 = Disable (Mute)
1 = Enable Path
LMIXSEL Signal to Right Mixer Volume
000 = +6dB
… (3dB steps)
111 = -15dB
Right DAC to Right Mixer
0 = Disable (Mute)
1 = Enable Path
RMIXSEL Signal to Right Mixer
0 = Disable (Mute)
1 = Enable Path
RMIXSEL Signal to Right Mixer Volume
000 = +6dB
… (3dB steps)
111 = -15dB
0 = Disable (Mute)
1 = Enable Path (-6dB gain)
0 = Disable (Mute)
1 = Enable Path
LMIXSEL Signal to Mono Mixer
Volume
000 = +6dB
… (3dB steps)
111 = -15dB
Right DAC to Mono Mixer
0 = Disable (Mute)
1 = Enable Path
RMIXSEL Signal to Mono Mixer
0 = Disable (Mute)
1 = Enable Path
RMIXSEL Signal to Mono Mixer
Volume
000 = +6dB
… (3dB steps)
111 = -15dB
Left DAC to Mono Mixer
LMIXSEL Signal to Mono Mixer
DESCRIPTION
DESCRIPTION
PD Rev 4.0 August 2008
Production Data
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