WM8750L_12 Datasheet, PDF (20/65 Pages) Wolfson Microelectronics plc – Stereo CODEC for Portable Audio Applications

WM8750L
REGISTER
BIT
ADDRESS
LABEL
R31 (1Fh)
8 DS
ADC Input Mode
Table 5 Differential Input Select
DEFAULT
Production Data
DESCRIPTION
0
Differential input select
0: LINPUT1 - RINPUT1
1: LINPUT2 – RINPUT2
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. For analogue mono mix either the left or right channel ADC
can be used, allowing the unused ADC to be powered off or used for a dc measurement conversion.
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.
Note:
If DC measurement is selected this overrides the MONOMIX selection.
REGISTER BIT
ADDRESS
LABEL
R31 (1Fh)
7:6 MONOMIX
ADC input
[1:0]
Mode
Table 6 Mono Mixing
DEFAULT
DESCRIPTION
00
00: Stereo
01: Analogue Mono Mix (using left ADC)
10: Analogue Mono Mix (using right ADC)
11: Digital Mono Mix
REGISTER
ADDRESS
R23 (17h)
Additional
Control (1)
BIT
LABEL
3:2 DATSEL
[1:0]
DEFAULT
00
Table 7 ADC Data Output Configuration
DESCRIPTION
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
The MICBIAS output provides a low noise reference voltage suitable for biasing electret type
microphones and the associated external resistor biasing network. Refer to the Applications
Information section for recommended external components. The output can be enabled or disables
using the MICB control bit (see also the “Power Management” section).
REGISTER
ADDRESS
R25 (19h)
Power
Management (1)
BIT LABEL
1 MICB
Table 8 Microphone Bias Control
DEFAULT
DESCRIPTION
0
Microphone Bias Enable
0 = OFF (high impedance output)
1 = ON
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PD, Rev 4.4, August 2012
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