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WM8956CGEFL/V Datasheet(PDF) 22 Page - Wolfson Microelectronics plc

Part # WM8956CGEFL/V
Description  Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers
PDF  80 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8956CGEFL/V Datasheet(HTML) 22 Page - Wolfson Microelectronics plc

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WM8956
Production Data
w
PD, November 2011, Rev 4.1
22
LINE INPUTS
Two pairs of stereo line inputs (LINPUT2 / RINPUT2 and LINPUT3 / RINPUT3) are available as
analogue inputs into the output mixers via the bypass paths.
See "Output Signal Path" for more information on the bypass paths.
INPUT BOOST
The boost stage in the input path can mix signals from the microphone PGAs and the line inputs.
The boost stage can provide up to +29dB additional gain from the microphone PGA output, providing
a total maximum available analogue gain of +59dB from microphone to output mixers. The
microphone PGA path to the boost mixer is muted using LINMUTE and RINMUTE as shown in Table
4. Microphone PGA to boost gain settings are shown in Table 5.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R32 (20h)
Left Input
Signal Path
5:4
LMICBOOST
[1:0]
00
Left Channel Input PGA Boost Gain
00 = +0dB
01 = +13dB
10 = +20dB
11 = +29dB
R33 (21h)
Right Input
Signal Path
5:4
RMICBOOST
[1:0]
00
Right Channel Input PGA Boost
Gain
00 = +0dB
01 = +13dB
10 = +20dB
11 = +29dB
Table 5 Microphone PGA Boost Control
For line inputs, -12dB to +6dB gain is available on the boost mixer, with mute control, as shown in
Table 6.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R43 (2Bh)
Input Boost
Mixer 1
6:4
LIN3BOOST
[2:0]
000
LINPUT3 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
3:1
LIN2BOOST
[2:0]
000
LINPUT2 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
R44 (2Ch)
Input Boost
Mixer 2
6:4
RIN3BOOST
[2:0]
000
RINPUT3 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
3:1
RIN2BOOST
[2:0]
000
RINPUT2 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
Table 6 Line Input Boost Control
When all three input paths to the boost mixer are disabled, the boost mixer will automatically be
muted.



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