WM8971L Wolfson Microelectronics Ltd., WM8971L Datasheet - Page 19

• Manufacturer Part Number: WM8971L
• Description: Stereo Codec for Portable Audio Applications
• Manufacturer: Wolfson Microelectronics Ltd.

Production Data
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Table 3 Input Software Control
MONO MIXING
The stereo ADC can operate as a stereo or mono device, or the two channels can be mixed to mono,
either in the analogue domain (i.e. before the ADC) or in the digital domain (after the ADC).
MONOMIX selects the mode of operation. The user also has the flexibility to select the data output
from the audio interface using DATSEL. The default is for left and right channel ADC data to be
output, but the interface may also be configured so that e.g. left channel ADC data is output as both
left and right data for when an analogue mono mix is selected.
Table 4 Mono Mixing
Table 5 ADC Data Output Configuration
R32 (20h)
ADC Signal
Path Control
(Left)
R33 (21h)
ADC Signal
Path Control
(Right)
R31 (1Fh)
ADC input
Mode
R23 (17h)
Additional
Control (1)
REGISTER
REGISTER
ADDRESS
ADDRESS
REGISTER
ADDRESS
BIT
7:6
BIT
3:2
7:6
5:4
7:6
5:4
BIT
MONOMIX
[1:0]
DATSEL
[1:0]
LABEL
LABEL
LINSEL
LMICBOOST
RINSEL
RMICBOOST
LABEL
00
DEFAULT
DEFAULT
00
00
00
00
00
DEFAULT
00: left data=left ADC; right data =right ADC
01: left data =left ADC; right data = left ADC
10: left data = right ADC; right data =right ADC
11: left data = right ADC; right data = left ADC
00: Stereo
01: Analogue Mono Mix (using left ADC)
10: Analogue Mono Mix (using right ADC)
11: Digital Mono Mix
00 = LINPUT1
11 = Differential
Left Channel Microphone Gain Boost
00 = Boost off (bypassed)
01 = 13dB boost
10 = 20dB boost
11 = 29dB boost
Right Channel Input Select
00 = RINPUT1
01 = MIC
11 = Differential
00 = Boost off (bypassed)
01 = 13dB boost
10 = 20dB boost
11 = 29dB boost
Left Channel Input Select
Right Channel Microphone Gain Boost
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD Rev 4.1 August 2005
WM8971L
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