參數(shù)資料
型號(hào)： WM8768GEDS
廠商： Wolfson Microelectronics
英文描述： 24-bit, 192kHz 8-Channel DAC
中文描述： 24位，192kHz的8通道DAC
文件頁(yè)數(shù)： 27/38頁(yè)
文件大?。?/td> 393K
代理商： WM8768GEDS
Production Data
WM8768
w
PD Rev 4.1 March 2005
27
AUTOMUTE
The WM8768 can automute by counting zero samples on the DIN1/2/3/4 inputs. When 1024 zero
samples are counted on one channel, one of four internal zero flags (zflag1/2/3/4 shown in figure 2)
is raised. Depending on the external hardware and settings of DZFM, MPD and IZD, different
automute operations are possible.
MUTE PIN AS OUTPUT
If the MUTE pin is connected to a high impedance (input to external mute circuitry for example) or left
floating, zflag1/2/3/4 will be output on the Mute pin dependent on DZFM settings. This is described in
Table 12 below. The output impedance of the MUTE pin is 10kOhms
{DZFM4,DZFM
[1:0]}
000
CONDITION UNDER WHICH MUTE
PIN DRIVEN HIGH
Zflag1, 2, 3 and 4 all high
001
Zflag1 high
010
Zflag2 high
011
Zflag3 high
100
Zflag4 high
101
Zflag1 and 2 high
110
Zflag1, 2 and 3 high
111
Zflag3 and 4 high
Table 12 Effect of DZFM on Mute Pin Output
When the Mute pin is used as an output, its logic level remains connected to the DZFM selector
inside the chip (see figure 1). So, when the WM8768 drives the Mute pin high, the output DACs will
also softmute as described by Table 13.
MPD
{DZFM4,DZFM [1:0]}
CHANNELS MUTED WHEN
MUTE PIN DRIVEN HIGH
All Channels
0
000
0
001
CH1
0
010
CH2
0
011
CH3
0
100
CH4
0
101
CH1 and CH2
0
110
CH1, CH2 and CH3
0
1
111
000
CH3 and CH4
All Channels
1
001
All Channels
1
010
All Channels
1
011
All Channels
1
100
All Channels
1
101
All Channels
1
110
All Channels
1
111
All Channels
Table 13 Mute Pin Decode when Mute Pin as Output
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