PBL38814 Просмотр технического описания (PDF) - Ericsson
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PBL38814 Datasheet PDF : 14 Pages
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PBL 388 14
-Txin 1
+Txin 2
F2out 3
Txout 4
TxDetin 5
TxDetout 6
Ref. 7
N Det 8
CMP 9
RxDetout 10
RxDetin 11
Rxout 12
24 CTR
23 LSPin
22 VA
21 VOL
20 LL
19 LSP
18 GNDA
17 GND
16 V+
15 -Rxin
14 +Rxin
13 F5out
24 pin DIP
Figure 4. Pin configuration.
Pin Descriptions
Refer to figure 6. (24 pin DIP and 24 pin SO package)
Pin
Symbol Description
Pin
1
-Txin
Transmitter channel negative input.
11
Input impedance 3.16 kohm.
2
+Txin Transmitter channel positive input.
12
Input impedance 100 kohm.
3
F2out Output of the second amplifier in the
13
transmitter channel.
4
Txout Transmitter channel output. Min. ac
14
load impedance 10 kohm.
5
TxDetin Input of the transmitter channel signal 15
detector. Input impedance 13 kohm.
6
TxDetout Output of the transmitter channel signal 16
detector. Goes nagative referred to the
internal ref. voltage of appx. 2V when a
transmitter signal is present.
17
7
Ref.
Internal reference app. 2V.
18
8
NDet
Background noise detector output.
Goes positive referred to the internal ref.
voltage of app. 2V when a background 19
noise signal is present
20
9
CMP
Comparator input. External resistance
to this point should not be less than
21
50 kohm. Summing point to the different
detector outputs.
10
RxDetout Output of the receiver channel signal
22
detector. Goes positive referred to the
internal ref. voltage of appx. 2V when a 23
receiver signal is present
24
-Txin 1
+Txin 2
F2out 3
Txout 4
TxDetin 5
TxDetout 6
Ref. 7
N Det 8
CMP 9
RxDetout 10
RxDetin 11
Rxout 12
24 CTR
23 LSP in
22 VA
21 VOL
20 LL
19 LSP
18 GNDA
17 GND
16 V+
15 -Rxin
14 +Rxin
13 F5out
24 pin SO
Symbol Description
RxDetin
Rxout
F5out
+Rxin
-Rxin
V+
GND
GNDA
LSP
LL
VOL
VA
LSPin
CTR
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.
System ground.
Power amplifier ground. Can lie positive
relative to GND, otherways connected
externally to GND.
Loudspeaker power amplifier output.
Feedback loop input
Volume control input. By sourcing a
current of appx. 0-40 µA into this pin the
gain can be reduced.
Positive supply for the loudspeaker
amplifier.
Loudspeaker amplifier signal input. Input
impedance 30 kohm.
Control input for gain dynamics
(25 or 50dB), mute and disable.
5
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