pbl388131sot ETC-unknow, pbl388131sot Datasheet - Page 5

• Manufacturer Part Number: pbl388131sot
• Description: Voice-switched Speakerphone Circuit With Built Loudspeaker Amplifier
• Manufacturer: ETC-unknow

Figure 6. Pin configuration.
Pin Descriptions
Refer to figure 6. (24 pin DIP and 24 pin SO package)
Pin
10
1
2
3
4
5
6
7
8
9
Symbol
-Txin
+Txin
F2out
Txout
TxDetin
TxDetout Output of the transmitter channel signal
NDet
CMP
RxDetout Output of the receiver channel signal
RxDetin
detector outputs.
Description
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.
detector. Goes nagative referred to the
internal ref. voltage of appx. 2V when a
transmitter signal is present.
Background noise detector output.
Goes positive referred to the internal ref.
voltage of app. 2V when a background
noise signal is present
Comparator input. External resistance
to this point should not be less than
50 kohm. Summing point to the different
detector. Goes positive referred to the
internal ref. voltage of appx. 2V when a
receiver signal is present
Input of the receiver channel signal
detector. Input impedance 13 kohm.
RxDetout
TxDetout
RxDetin
TxDetin
Rxout
+Txin
F2out
N Det
F5out
Txout
-Txin
CMP
10
11
12
1
2
3
4
5
6
7
8
9
24 pin DIP
19
18
17
16
15
14
13
24
23
22
21
20
LSPin
R
R
+Rxin
CTR
VOL
LSP
+L
-C
GND
-Rxin
V+
E
DC
Pin
13
14
15
16
17
18
19
20
21
22
23
24
11
12
Symbol
Rxout
F5out
+Rxin
-Rxin
V+
GND
-C
LS
VOL
+L
RDC
RE
LSPin
CTR
RxDetout
TxDetout
RxDetin
TxDetin
Rxout
F5out
+Txin
F2out
Txout
N Det
-Txin
CMP
10
11
12
1
2
3
4
5
6
7
8
9
24 pin SO
Description
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.
1.0mA.
System ground (- line ).
Loudspeaker power amplifier output.
Volume control input. By sourcing a
current of appx. 0-40 A into this pin the
gain can be reduced.
Positive supply for the loudspeaker
amplifier.
Power ampl. supply options. Pins - C,
RDC and RE are explained in the text.
Loudspeaker amplifier signal input. Input
impedance 30 kohm.
Control input for gain dynamics
(25 or 50dB), mute and disable.
A shunt regulator, voltage apprx. 3.3V at
24
23
22
21
20
19
18
17
16
15
14
13
CTR
LSP in
GND
-Rxin
+Rxin
R
R
VOL
LSP
V+
+L
-C
E
DC
PBL 388 13
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