wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 46

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
SIGNAL PATH CONTROL
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The inputs and outputs to the WM9081 are independently controlled as described in this section. The
input signal paths comprise two line inputs and the digital audio interface input. The output signal
paths comprise a line output and a selectable Class AB/D speaker driver.
INPUT SIGNAL PATH
There are three input signal paths to the analogue mixer. These are Line Input IN1, Line Input IN2
and the output from the DAC. These inputs can be mixed together as illustrated in Figure 32.
Line inputs IN1 and IN2 are enabled by the IN1_ENA and IN2_ENA registers. An optional -6dB gain
can be selected in either path if required, using IN1_VOL and IN2_VOL.
The signal path from the DAC to the mixer is enabled by setting DAC_SEL, as described in Table 26.
The DAC volume can be controlled in the digital domain as described in the “Digital to Analogue
Converter (DAC)” section.
Table 26 Input Signal Path Control
Figure 32 Input Signal Mixing
R7 (07h)
Analogue
Mixer
REGISTER
ADDRESS
BIT
4
3
2
1
0
DAC_SEL
IN2_VOL
IN2_ENA
IN1_VOL
IN1_ENA
LABEL
DEFAULT
0
0
0
0
0
DAC Path Enable
0 = Disabled
1 = Enabled
IN2 Volume Control
0 = 0dB
1 = -6dB
IN2 Path Enable
0 = Disabled
1 = Enabled
IN1 Volume Control
0 = 0dB
1 = -6dB
IN1 Path Enable
0 = Disabled
1 = Enabled
DESCRIPTION
PP, Rev 3.0, April 2009
Pre-Production
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