參數(shù)資料
型號(hào)： ALC202
廠商： Electronic Theatre Controls, Inc.
元件分類(lèi)： 圓形連接器
英文描述： Circular Connector; No. of Contacts:100; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:22-35 RoHS Compliant: No
中文描述： AC\u0026#39;97音頻編解碼器
文件頁(yè)數(shù)： 20/29頁(yè)
文件大?。?/td> 598K
代理商： ALC202
Preliminary
Avance Logic, Inc.
ALC202
-
20 -
Rev0.62
http://www.realtek.com.tw
5.8 Jack-Detect Function
JD (Jack-Detect) is an
internal pull high
input pin used to decide whether LINE-OUT should be auto
muted or not. If JDE (Jack Detect Enable) is set and ALC202 detects the JD is floating or pull high
(JDS=1), ALC202 will disable the analog output of LINE-OUT even the MX02 is not muted.
Fig5.8-1 shows the jack detect example to implement this function. If no audio plug is inserted in
HP-OUT jack, JD is detected as low, LINE output normally. If audio plug is inserted, ALC202
disable
LINE output, still output to HP-OUT and MONO-OUT
. It’s useful to some PC application especially
in notebook environment.
If headphone output jack is not implemented and HP-OUT kept as floating, once JDE is enable, LINE
output will be muted unless JD is pull low by a 10K ohm resistor (Fig5.8-2). To conquer this
disadvantage,
the Jack-Detect mute LINE-OUT function is disable after power up (default JDE is 0)
,
that make ALC202 compatible with others AC’97. So
it is software’s responsibility to enable this
function if headphone jack detection is implemented
.
Fig5.8-1 Jack detect connection example
Fig5.8-2 JD is pull low by a 10K ohm resistor
JD
HP-OUT-R
HP-OUT-L
4.7K
HP-OUT
5
4
3
2
1
+
3.3u
4.7K
4.7K
+
+100uf
+
+100uf
HP-OUT-R
HP-OUT-L
JD
10K
If HP-OUT jack is not implemented,
JD must be pulled low to prevent JDS is set
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