WM8956_07 Datasheet, PDF (29/80 Pages) Wolfson Microelectronics plc – Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers

Preliminary Technical Data
WM8956
REGISTER
BIT
ADDRESS
LABEL
DEFAULT
DESCRIPTION
R6 (06h)
6:5 DACPOL[1:0]
00
DAC Control (2)
DAC Polarity Control:
00 = Polarity not inverted
01 = DAC L inverted
10 = DAC R inverted
11 = DAC L and R inverted
R23 (17h)
Additional
Control (1)
4 DMONOMIX
0
DAC Mono Mix
0 = Stereo
1 = Mono (Mono MIX output on
enabled DACs)
Table 12 DAC Mono Mix and Phase Invert Select
3D STEREO ENHANCEMENT
The WM8956 has a digital 3D enhancement option to artificially increase the separation between the
left and right channels. This effect can only be used for playback, not for record.
The 3D enhancement function is activated by the 3DEN bit, and the 3DDEPTH setting controls the
degree of stereo expansion. Additionally, one of four filter characteristics can be selected for the 3D
processing, using the 3DUC and 3DLC control bits.
REGISTER
ADDRESS
R16 (10h)
3D enhance
BIT
LABEL
6
3DUC
5
3DLC
4:1 3DDEPTH
[3:0]
0
3DEN
Table 13 3D Stereo Enhancement Function
DEFAULT
DESCRIPTION
0
0
0000
0
Upper Cut-Off Frequency
0 = High (Recommended for
fs>=32kHz)
1 = Low (Recommended for
fs<32kHz)
Lower Cut-Off Frequency
0 = Low (Recommended for
fs>=32kHz)
1 = High (Recommended for
fs<32kHz)
3D Stereo Depth
0000 = 0% (minimum 3D effect)
0001 = 6.67%
....
1110 = 93.3%
1111 = 100% (maximum 3D effect)
3D Stereo Enhancement Enable
0 = Disabled
1 = Enabled
When 3D enhancement is enabled it may be necessary to attenuate the signal by 6dB to avoid
limiting. This is a user-selectable function, enabled by setting DACDIV2.
REGISTER
ADDRESS
R5 (05h)
DAC control (1)
BIT
7
LABEL
DACDIV2
Table 14 DAC 6dB Attenuation Select
DEFAULT
DESCRIPTION
0
DAC 6dB attenuate enable
0 = disabled (0dB)
1 = -6dB enabled
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PTD, July 2007, Rev 2.1
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