WM8750L
Production Data
DESCRIPTION
Differential input select
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
R31 (1Fh)
ADC Input Mode
DS
8
0
0: LINPUT1 - RINPUT1
1: LINPUT2 – RINPUT2
Table 5 Differential Input Select
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
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R31 (1Fh)
MONOMIX
[1:0]
00: Stereo
7:6
00
ADC input
Mode
01: Analogue Mono Mix (using left ADC)
10: Analogue Mono Mix (using right ADC)
11: Digital Mono Mix
Table 6 Mono Mixing
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R23 (17h)
DATSEL
[1:0]
00: left data=left ADC; right data =right ADC
01: left data =left ADC; right data = left ADC
3:2
00
Additional
Control (1)
10: left data = right ADC; right data =right
ADC
11: left data = right ADC; right data = left
ADC
Table 7 ADC Data Output Configuration
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
BIT
LABEL DEFAULT
MICB
DESCRIPTION
R25 (19h)
Microphone Bias Enable
1
0
Power
Management (1)
0 = OFF (high impedance output)
1 = ON
Table 8 Microphone Bias Control
PD, Rev 4.4, August 2012
20
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
