參數(shù)資料
型號(hào)： AD1886A
廠商： Analog Devices, Inc.
英文描述： IR Emitting Diode; Power Dissipation, Pd:50mW; Viewing Angle:45 ; Package/Case:SIP; Operating Temperature Range:-25 C to +85 C; Leaded Process Compatible:Yes RoHS Compliant: Yes
中文描述： AC\u0026#39;97聲卡SoundMAX編解碼器
文件頁(yè)數(shù)： 25/28頁(yè)
文件大小： 281K
代理商： AD1886A
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AD1886A
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CONNECTING THE JACK SENSE TO THE OUTPUT JACKS
Headphone Jack
The diagram on Figure 12 shows the preferred method to connect the Jack Sense line to the HP_OUT jack. This scheme requires a
stereo jack with a normally closed and isolated single switch. The switch holds the Jack Sense line low (grounded) until an audio plug
is inserted, causing the switch to open and the Jack Sense line to go high due to the codec internal pull-up.
The R2 and R3 resistors keep the electrolytic output caps properly polarized while the HP_OUT jack is not used.
L1 600Z
L2 600Z
C4
470pF
C1
470pF
OPTIONAL EMC
COMPONENTS
ISOLATED
NC SWITCH
+
+
NOTE: LOCATE R1 CLOSE TO CODEC.
R1
2k
JACK SENSE LINE
TO CODEC JS (PIN 47)
FROM CODEC HP_OUT_R (PIN 41)
FROM CODEC HP_OUT_L (PIN 39)
HEADPHONE OUT
5
4
3
2
1
R2
10k
R3
10k
C2
220 F
C3
220 F
Figure 12. Jack Sense Connection to HP_OUT Jack, Using Isolated Switch
Alternatively, when an audio output jack containing an isolated switch is not available, the circuit shown in Figure 13 can be used.
While the audio plug is out, this circuit keeps the Jack Sense line state low, by the pull-down effect of R2 (with no audio present) or
by tracking the lower peaks of the HP_OUT audio signal. Once an audio plug is inserted and the jack switch opens, the Jack Sense
line switches to a high state due to the codec internal pull-up, which quickly charges C1 to DV
DD
.
The R2 and R3 resistors also keep the electrolytic output caps properly polarized while the HP_OUT jack is not used.
L1 600Z
L2 600Z
C4
470pF
OPTIONAL EMC
COMPONENTS
+
+
NOTE: LOCATE R1 AND C1 CLOSE TO CODEC.
JACK SENSE
TO CODEC JS (PIN 47)
FROM CODEC HP_OUT_R (PIN 41)
FROM CODEC HP_OUT_L (PIN 39)
HEADPHONE OUT
1
2
3
4
5
J1
C5
470pF
D1
MMBD914
R1
2k
R2
10k
R3
10k
C1
2 F
CERAMIC
C2
220 F
C3
220 F
Figure 13. Jack Sense Connection to HP_OUT Jack, Using Nonisolated Switch
LINE OUT JACK
Although not shown, if a LINE_OUT jack is used and the Jack Sense functionality is desired with this jack, the LINE_OUT jack
should be wired in a similar configuration as shown above for the HP_OUT jack (preferably Figure 12). We recommend that in this
case the output coupling caps (C2, C3) be set to 2.2
μ
F. All other values should be kept the same.
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