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參數(shù)資料
| 型號(hào)： | PBL388141SO |
| 廠商： | ERICSSON |
| 英文描述： | Voice - switched 2-channel Circuit with loudspeaker amplifier |
| 中文描述： | 語(yǔ)音-開(kāi)關(guān)2聲道揚(yáng)聲器放大器電路 |
| 文件頁(yè)數(shù)： | 5/14頁(yè) |
| 文件大小： | 239K |
| 代理商： | PBL388141SO |
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5
PBL 388 14
Figure 4. Pin configuration.
Pin Descriptions
Refer to figure 6. (24 pin DIP and 24 pin SO package)
24 pin SO
Pin
Symbol
Description
1
-Txin
Transmitter channel negative input.
Input impedance 3.16 kohm.
Transmitter channel positive input.
Input impedance 100 kohm.
Output of the second amplifier in the
transmitter channel.
Transmitter channel output. Min. ac
load impedance 10 kohm.
Input of the transmitter channel signal
detector. Input impedance 13 kohm.
TxDetout Output of the transmitter channel signal
detector. Goes nagative referred to the
internal ref. voltage of appx. 2V when a
transmitter signal is present.
Ref.
Internal reference app. 2V.
NDet
Background noise detector output.
Goes positive referred to the internal ref.
voltage of app. 2V when a background
noise signal is present
CMP
Comparator input. External resistance
to this point should not be less than
50 kohm. Summing point to the different
detector outputs.
RxDetout Output of the receiver channel signal
detector. Goes positive referred to the
internal ref. voltage of appx. 2V when a
receiver signal is present
2
+Txin
3
F2out
4
Txout
5
TxDetin
6
7
8
9
10
Pin
Symbol
Description
11
RxDetin
Input of the receiver channel signal
detector. Input impedance 13 kohm.
Receiver channel output. Min. ac load
impedance 10 kohm.
Output of the second amplifier in the
receiver channel.
Receiver channel positive input. Input
impedance 140 kohm.
Receiver channel negative input. Input
impedance 20 kohm.
Supply of the speech switching circuitry.
A shunt regulator, voltage apprx. 3.3V at
1.0mA.
GND
System ground.
GND
A
Power amplifier ground. Can lie positive
relative to GND, otherways connected
externally to GND.
LSP
Loudspeaker power amplifier output.
LL
Feedback loop input
VOL
Volume control input. By sourcing a
current of appx. 0-40
μ
A into this pin the
gain can be reduced.
V
A
Positive supply for the loudspeaker
amplifier.
LSPin
Loudspeaker amplifier signal input. Input
impedance 30 kohm.
CTR
Control input for gain dynamics
(25 or 50dB), mute and disable.
12
Rxout
13
F5out
14
+Rxin
15
-Rxin
16
V+
17
18
19
20
21
22
23
24
24 pin DIP
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
23
24
-Txin
+Txin
F2out
Txout
TxDetin
TxDetout
Ref.
CMP
RxDetout
RxDetin
Rxout
F5out
+Rxin
-Rxin
V+
GND
A
LSP
LL
V
A
VOL
LSPin
GND
CTR
N Det
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
23
24
-Txin
+Txin
F2out
Txout
TxDetin
TxDetout
N Det
CMP
RxDetout
RxDetin
Rxout
F5out
+Rxin
-Rxin
V+
GND
A
LSP
LL
V
A
VOL
LSP in
GND
CTR
Ref.
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