DataSheetWiki


PBL388131SOT fiches techniques PDF

Ericsson - Voice-switched Speakerphone Circuit with built in loudspeaker amplifier

Numéro de référence PBL388131SOT
Description Voice-switched Speakerphone Circuit with built in loudspeaker amplifier
Fabricant Ericsson 
Logo Ericsson 





1 Page

No Preview Available !





PBL388131SOT fiche technique
January 1998
PBL 388 13
Voice-switched Speakerphone Circuit
with built in loudspeaker amplifier
Description.
Key Features
The PBL 388 13 contains all the necessary circuitry, amplifiers, detectors,
comparator and control functions to implement a high performance, voice-switched,
loudspeaking, ”hands-free ” telephone. The gain dynamics (attenuation between
channels) is selectable (25dB or 50dB) via a separate pin. A background noise detector
in the transmitting channel reduces the influence of continuous external noise signals
to the switching .
The PBL 388 13 is designed for telephone systems that are either powered from
the telephone line or from a mains powered constant voltage dc. supply. The circuit
contains a transformerless audio power amplifier with a current supply circuitry
(patented) that eliminates the need of inductors. Automatic volume attenuation in the
power amplifier extends the operating range at low line currents. A special feature in
this circuit is that the power amplifier volume control can be implemented either as an
ac. potentiometer control or as a digital control by a µ-processor (dc. control).
Filtering is possible of both, the audio and the speech switching control signals,
in both transmitter and receiver channels.
17 18 19 20
Minimum of external components
needed for function.
Selectable gain dynamics. (25 or 50
dB)
Direct telephone line powered solution
(patented).
Low power consumption: 1mA at 3.3V
(typical) for speech switching, audio
power amplifier quiscent current 1mA.
Drives an 25 - 50 ohm loudspeaker
without a transformer.
Background noise compensation in the
transmitting channel with hold function
at receive.
Input amplifiers of both channels have
balanced inputs.
Exellent noise performance.
Encapsulated in 24 pin plastic ”skinny”
DIP and 24 pin SO .
22
+
21
4
24
15 +
F3
3
5
PBL 388 13
Control
F6
23
16
11
12
10
24 pin SO
F2
1
2
F1
+
7
F5
Ref.
68 9
14
F4
+
13
24 pin DIP
Figure 1. Block diagram.
1

PagesPages 16
Télécharger [ PBL388131SOT ]


Fiche technique recommandé

No Description détaillée Fabricant
PBL388131SO Voice-switched Speakerphone Circuit with built in loudspeaker amplifier Ericsson
Ericsson
PBL388131SOT Voice-switched Speakerphone Circuit with built in loudspeaker amplifier Ericsson
Ericsson

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche