wm8953 Wolfson Microelectronics plc, wm8953 Datasheet - Page 34

• Manufacturer Part Number: wm8953
• Description: Low Power Stereo Adc With Pll And Tdm Interface Low Power Stereo Adc With Pll And Tdm Interface
• Manufacturer: Wolfson Microelectronics plc

WM8953
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INPUT MIXER ENABLE
The WM8953 has two analogue input mixers which allow the Input PGAs and Line Inputs to be
combined in a number of ways and output to the ADCs.
The input mixers INMIXL and INMIXR are enabled by the AINL_ENA and AINR_ENA register bits, as
described in Table 9.
Table 9 Input Mixer Enable
INPUT MIXER VOLUME CONTROL
The Input Mixer volume controls are described in Table 10 for the Left Channel and Table 11 for the
Right Channel. The Input PGA levels may be set to Mute, 0dB or 30dB boost. The other gain controls
provide adjustment from -12dB to +6dB in 3dB steps.
To prevent pop noise it is recommended that gain and mute controls for the input mixers are not
modified while the signal paths are active. If volume control is required on the input signal path it is
recommended that the input PGA volume controls or the ADC volume controls are used instead of
the input mixer gain registers.
Table 10 Left Input Mixer Volume Control
R2 (02h)
R41 (29h)
R43 (2Bh)
REGISTER
REGISTER
ADDRESS
ADDRESS
9
8
8
7
5
4
8:6
BIT
BIT
AINL_ENA
(rw)
AINR_ENA
(rw)
L34MNB
L34MNBST
L12MNB
L12MNBST
LI2BVOL
[2:0]
LABEL
LABEL
0b
0b
DEFAULT
0b
0b
0b
0b
000b
(Mute)
DEFAULT
Left Input Path Enable
0 = Input Path disabled
1 = Input Path enabled
Right Input Path Enable
0 = Input Path disabled
1 = Input Path enabled
LIN34 PGA Output to INMIXL Mute
0 = Mute
1 = Un-Mute
LIN34 PGA Output to INMIXL Gain
0 = 0dB
1 = +30dB
LIN12 PGA Output to INMIXL Mute
0 = Mute
1 = Un-Mute
LIN12 PGA Output to INMIXL Gain
0 = 0dB
1 = +30dB
LIN2 Pin to INMIXL Gain and Mute
000 = Mute
001 = -12dB
010 = -9dB
011 = -6dB
100 = -3dB
101 = 0dB
110 = +3dB
111 = +6dB
DESCRIPTION
DESCRIPTION
PD, January 2009, Rev 4.0
Production Data
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