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TEMIC Semiconductors - Telephone Speech Circuit

Numéro de référence U4030B
Description Telephone Speech Circuit
Fabricant TEMIC Semiconductors 
Logo TEMIC Semiconductors 





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U4030B fiche technique
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Telephone Speech Circuit
U4030B
Description
The U4030B is an electronic speech circuit for standard
and feature telephones. It replaces the hybrid transformer,
earphone and microphone interface and the supply
voltage generation for external components, e.g. dialer or
microcomputers. Using the U4030B in telephone circuit
designs can improve transmission quality and results in
cost savings through shorter and more flexible design
procedures. It reduces the amount of external components
needed. The U4030B uses TEMIC’s reliable bipolar
technology and is offered in a SO20 package.
Features
D Microphone amplifier with
– Symmetrical input
– Privacy function
– Anticlipping
D Built in ear protection
D Power down input
D Mute input
D DTMF interface
D Low line impedance during pulse dialing
Benefits
D Independent adjustment of
– Transmission gain
– Receiving gain
– Sidetone suppression
– Frequency response
D Low-impedance supply voltage for all external blocks
D Supply voltage for an electret microphone
Applications
D Standard telephone
D Fax machine
D Answering machine
D Cordless telephone
Block Diagram
10
DTMF
PRIV
MIC1
MIC2
16
12
13
GT MICO
11 9
+
ST
5
+
TXA
GR RECO
67
+–
Ear protection
REC.ATT.
4 CK
Limiter
3
CLIM
Mute
8
MUTE
17
PD
Power supply
U 4030 B
14
GND
18 1
SWAMP VM
15 VL
19 RDC
2 VC
20
VD
Figure 1.
Ordering Information
93 7618 e
Extended Type Number
U4030B-AFL
U4030B-AFLG3
Package
SO20
SO20
Remarks
Taped and reeled
Rev. A2, 27-Jan-98
1 (14)

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