WM8741 Wolfson Microelectronics plc, WM8741 Datasheet - Page 36

• Manufacturer Part Number: WM8741
• Description: 24-bit 192khz Dac With Advanced Digital Filtering
• Manufacturer: Wolfson Microelectronics plc

WM8741
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DIFFERENTIAL MONO MODE
DIFF[1:0] sets the required differential output mode; normal stereo, reversed stereo, mono left or
mono right, as shown in Table 36.
Table 36 Differential Output Modes
Using these controls a pair of WM8741 devices may be used to build a dual differential stereo
implementation with higher performance and differential output.
DITHER
Dither is applied whenever internal truncation occurs. It is also used when a 32 bit input word is
applied to the DAC prior to truncation to the internal wordlength. Three types of dither can be
selected to allow the sound quality if the device to be optimised.
TDF has a triangular probability density function and causes zero noise modulation i.e.
quantisation noise is invariant to the changes in the signal level. This mode is recommended and is
selected by default.
RPDF has a rectangular probability density function and may cause noise modulation.
HPDF has a triangular probability density function with a high pass characteristic, which has a lower
noise at low frequencies at the expense of raised noise levels at higher frequencies.
Alternatively the dither can be disabled.
Table 37 Dither Control
REGISTER ADDRESS
REGISTER ADDRESS
Mode Control 2
Mode Control 2
08h
08h
R8
R8
[3:2]
[1:0]
BIT
BIT
DIFF[1:0]
DITHER
LABEL
LABEL
[1:0]
DEFAULT
DEFAULT
00
10
00 = Stereo
10 = Stereo reverse (left and right
01 = Mono left – differential outputs
11 = Mono right – differential outputs.
Digital filter dither mode select:
00 = dither off
01 = RPDF dither applied in Digital
filter
10 = TPDF dither applied in Digital
filter
11 = HPDF dither applied in Digital
filter
Note: DITHER[1:0] applies only to the
dither mode in the Digital filter.
channels swapped)
VOUTLP (17) is left channel.
VOUTLN (16) is left channel
inverted.
VOUTRP (12) is left channel
inverted.
VOUTRN (13) is left channel.
VOUTLP (17) is right channel
inverted.
VOUTLN (16) is right channel.
VOUTRP (12) is right channel.
VOUTRN (13) is right channel
inverted.
DESCRIPTION
DESCRIPTION
PD, Rev 4.1, August 2009
Production Data
the
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