WM8960 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8960' PDF : 91 Pages View PDF
Production Data
WM8960
INPUT BOOST
The input path to the ADCs is via a boost stage, which 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 to the
ADC input, providing a total maximum available analogue gain of +59dB from microphone to ADC.
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
R32 (20h)
ADCL Signal
path
BIT
5:4
LABEL
LMICBOOST
[1:0]
R33 (21h)
5:4
ADCR Signal
path
RMICBOOST
[1:0]
Table 5 Microphone PGA Boost Control
DEFAULT
00
00
DESCRIPTION
Left Channel Input PGA Boost Gain
00 = +0dB
01 = +13dB
10 = +20dB
11 = +29dB
Right Channel Input PGA Boost
Gain
00 = +0dB
01 = +13dB
10 = +20dB
11 = +29dB
For line inputs, -12dB to +6dB gain is available on the boost mixer, with mute control, as shown in
Table 6.
REGISTER
ADDRESS
R43 (2Bh)
Input Boost
Mixer 1
BIT
6:4
LABEL
LIN3BOOST
[2:0]
3:1
LIN2BOOST
[2:0]
R44 (2Ch)
6:4
Input Boost
Mixer 2
RIN3BOOST
[2:0]
3:1
RIN2BOOST
[2:0]
Table 6 Line Input Boost Control
DEFAULT
DESCRIPTION
000
LINPUT3 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
000
LINPUT2 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
000
RINPUT3 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
000
RINPUT2 to Boost Mixer gain
000 = Mute
001 = -12dB
...3dB steps up to
111 = +6dB
When all three input paths to the boost mixer are disabled, the boost mixer will automatically be
muted.
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PD, August 2013, Rev 4.2
23
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