WM8768_10 WOLFSON [Wolfson Microelectronics plc], WM8768_10 Datasheet - Page 28

• Manufacturer Part Number: WM8768_10
• Description: 24-bit, 192kHz 8-Channel DAC
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8768
w
INFINITE ZERO DETECT
When it is set, the IZD register causes an analogue mute of the DAC channel output amplifier both
when there are 1024 zeros on that channel’s DIN pin or when it is manually muted by DMUTE or
MUTEALL.
This operation is only available in software mode and can sometimes create a very small click at the
output of the device.
DE-EMPHASIS MODE
Each stereo DAC channel has an individual de-emphasis control bit:
Refer to Figure 25, Figure 26, Figure 27, Figure 28, Figure 29 and Figure 30 for details of the De-
Emphasis performance at different sample rates.
Table 14 De-emphasis Control
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
{DEEMPH4,DEEMPH
DAC Channel Control
DAC De-emphahsis
DAC DEEMPH
DAC4 Control
0000010
0001001
0001111
0000010
Control
[2:0]}
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
[8:6]
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
BIT
BIT
BIT
CHANNEL 4
4
4
1
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DAC
LABEL
DEEMPH4
DEEMP
DEEMPH
LABEL
IZD
LABEL
ALL
[2:0]
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
DEFAULT
CHANNEL 3
DEFAULT
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEFAULT
DAC
0
0
000
0
IZD Enable
DEEMPH Select:
channel selection select:
selection select:
DAC 3, 2 and 1 De-emphasis
DAC 4 De-emphasis channel
0 : Disable infinite zero mute
1: Enable infinite zero mute
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
CHANNEL 2
0 : Normal Operation
1: De-emphasis all channels
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DAC
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD Rev 4.3 July 2010
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
Not-DEEMPH
CHANNEL 1
Production Data
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DEEMPH
DAC
28