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PBL388121SO Datasheet(PDF) 6 Page - Ericsson

Part # PBL388121SO
Description  Voice-switch circuit for Handsfree speakerphone TAM
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Manufacturer  ERICSSON [Ericsson]
Direct Link  http://www.ericsson.com
Logo ERICSSON - Ericsson

PBL388121SO Datasheet(HTML) 6 Page - Ericsson

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PBL 388 12
6
Figure 6. Receiver and transmitter channel input arrangement.
Figure 5. Passive networks setting the speech control function.
Functional Description
Speech control section
Transmitter and Receiver
Channels
The transmitter and receiver channels
consist of three amplifying stages each,
F1, F2, F3 and F4, F5, F6. The inputs of
the amplifiers must be ac. coupled
because they are dc. vise at the internal
reference voltage (
≈2V) level. F1 and F4
are fixed gain amplifiers of 30,5 dB and
15.5 dB respectively, while the rest of them
are of controlled gain type.The gain of F2,
F3 as well as F5 and F6 is controlled by
comparators. The comparator receives its
information partly from the summing point
of the transmitter, receiver and backgro-
und noise detectors at CMP input and
partly through the control input, CTR,
which controls the gain dynamics (25 or
50 dB). Amplifiers F2 and F3 have the
maximum gain when the transmitter
channel is fully open, consequently the
amplifiers F5 and F6 will have minimum
gain and vice versa. See figure 5 and figure
11.
The positive input on transmitter and the
negative input on receiver channel has a
rather high input impedance. It renders a
good
gain
precision
and
noise
performance when used with low signal
source impedance. The differential input
of the transmitter channel can be used to
suppress unwanted signals in the
microphone supply, see figure 7. Also see
application 1.
Signal Detectors and
Comparator
The signal detectors sense and rectify
the receiver and microphone signals to
opposite polarities referenced to the
internal reference voltage of approx. 2V.
The voltage at RxDet will go positive and
at TxDet negative in the presence of a
signal at the respective channel input. In
the idle (no signal) state, the voltages at
RxDet ,TxDet and CMP are equal to the
internal reference voltage. Signal at Txin
will result in an decreasing level at
TxDetout and hence also at CMP input.
R5
C3
C1
C2
C4
F2
F3
F1
PBL 388 12
1
5
15
4
2
3
87
9
10
+
-
+
CTR
CMP
V+
N Det
Rxout
Rxin
TxDet
RxDet
-Txin
+
Txin
Txout
12
14
F6
F5
Control
F4
+
Ref.
13
11
6
GND
16
+
+
F1
F4
2
3
14
F5
+
+
F2
VRxin
VTxin
100k
3k
100k
120k
120k
20k
Tx
Ref.
I
~
16
3k
PBL388 12
~
Rx


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