PBL38812 Datasheet PDF - Ericsson
| Part Number | PBL38812 | |
| Description | Voice-switch circuit for Handsfree speakerphone TAM | |
| Manufacturers | Ericsson | |
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PBL 388 12
Voice-switch circuit for
Handsfree speakerphone TAM
Description
Key Features
The PBL 388 12 contains all the necessary circuitry, amplifiers, detectors, comparators
and control functions to implement a high performance, voice-switched, ”hands-free ”
function in an answering machine. The gain dynamics (attenuation between channels)
is settable (25dB or 50dB) via CTR pin that also control two mute levels. A background
noise detector in the transmitting channel reduces the influence of continuous noise sign-
als.
The PBL 388 12 is designed for answering machines that are either powered from the
telephone line or from a mains powered dc. supply.
Filtering of both the audio and control signals in both transmitter and receiver channels
possible.
An external loudspeaker amplifier has to be used, normally the same as used for the
answering machine.
All figures in this paper refer to 16-pin SO package.
• Settable gain dynamics (25 or 50
dB).
• Low power consumption, totally
1.0mA at 3.3V typical.
• Background noise compensation in
the transmitting channel with hold
function.
• Exellent noise performance.
• Both channel input amplifiers have
balanced inputs.
• Minimum of external components
needed for function.
• 16-pin SO and 18-pin DIP
encapsulation.
1
5
F3
4
6
15 +
F2
PBL 388 12
Control
F6
12
16
13
11
F5
16-pin SO
2–
3
F1
+
8
Ref.
7 9 10
Figure 1. Block diagram. ( SO - package )
F4 + 14
18-pin DIP
1
|
| |
 
PBL 388 12
CTR 1
-Txin 2
+Txin 3
F2out 4
Txout 5
TxDetin 6
TxDetout 7
NDet 8
16 GND
15 +V
14 -Rxin
13 F5out
12 Rxout
11 RxDetin
10 RxDetout
9 CMP
F2out 1
Txout 2
TxDetin 3
TxDetout 4
N Det 5
CMP 6
RxDetout 7
Rx Detin 8
Rxout 9
18 +Txin
17 -Txin
16 CTR
15 NC
14 GND
13 +V
12 -Rxin
11 +Rxin
10 F5out
16-pin SO
18-pin DIP
Figure 4. Pin configuration.
Pin Descriptions:
Refer to figure 4. (16-pin SO and 18-pin DIP package)
Pin Pin
SO DIP Symbol Description
Pin Pin
SO DIP Symbol
Description
1 16 CTR
Control input for gain dynamics
9 6 CMP
Comparator input..
(25 or 50dB), mute and disable.
Summing point to the different
2 17 -Txin
Transmitter channel negative input.
detector outputs.
Input impedance 3 kohm.
10 7 RxDetout Output of the receiver channel signal
3 18 +Txin
Transmitter channel positive input.
Input impedance 100 kohm.
4 1 F2out
Output of the second amplifier in the
transmitter channel.
5 2 Txout
Transmitter channel output. Min. ac
load impedance 10 kohm.
6 3 TxDetin Input of the transmitter channel signal
detector. Input impedance 13 kohm.
7 4 TxDetout Output of the transmitter channel signal
detector. Goes nagative referred to the
internal ref. voltage of app. 2V when a
11 8 RxDetin
12 9 Rxout
13 10 F5out
11 +Rxin
detector. Goes positive referred to the
internal ref. voltage of app. 2V when a
receiver signal is present
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.
transmitter signal is present.
14 12 -Rxin
Receiver channel negative input. Input
8 5 NDet
Background noise detector output.
impedance 20 kohm.
Goes positive referred to the internal ref. 15 13 V+
Supply of the speech switching
voltage of app. 2V when a backgrounud
circuitry. A shunt regulator, voltage
noise signal is present
apprx. 3.3V at 1.0mA.
16 14 GND
System ground.
15 NC
Not connected.
5
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| Information | Total 10 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ PBL38812.PDF Datasheet ] | |
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