U4050B TEMIC Semiconductors, U4050B Datasheet
U4050B
Manufacturer Part Number
U4050B
Description
Speech Circuit
Manufacturer
TEMIC Semiconductors
Datasheet
1.U4050B.pdf
(18 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
U4050B
Manufacturer:
TFK
Quantity:
20 000
www.DataSheet4U.com
Rev. A2, 05-Mar-98
Speech Circuit with Line-Powered Loudspeaker Amplifier
Description
The electronic speech circuit U4050B is a linear
integrated circuit for use in telephone sets. It replaces the
hybrid transformer, sidetone equivalent and ear
protection rectifiers.
Features
D Integrated amplifier for loudhearing operation
D Anticlipping for loudspeaker amplifier
D Supply voltages for all functional blocks of a
D Adjustable DC characteristics
D Adjustable sending and receiving amplification
D Automatic line loss compensation
D Symmetrical output of earpiece amplifier
D Built-in ear protection
D Symmetrical input of microphone amplifier
D Adjustable sidetone suppression independent
Block Diagram
Ordering Information
subscriber set
of sending and receiving amplification
Extended Type Number
U4050B-AFLG3
U4050B-AFL
DTMF
MIC1
MIC2
LEVSQ
CSQ
8
10
11
12
13
SQUELCH
LIMITER
CLIM
5
GS
9
–
+
MUTE
MUTE
16
MICO
7
TXA
Figure 1. Block diagram
Package
TIN
SO28
SO28
PD
15
NSA
25
+
–
ST
4
AGA
The circuit is line powered and contains all components
necessary for amplification of signals and adaptation to
the line. An integrated loudspeaker amplifier allows
loudhearing operation.
D DTMF and MUTE inputs
D Anticlipping in transmit direction
D Squelch
D Integrated transistor for short circuiting the line
D Power down
D Operation possible at line currents above 10 mA
Benefits
D Independent adjustment of transmit gain, receive gain
D Low number of external components
GND
Power supply
GR
U4050B
22
voltage
and sidetone suppression
2
–
+
IREF
28
RECO1
SWAMP
Taped and reeled
REC. ATT.
3
18
SAI
VM
LIMSA
14
RECO2
20
VD
1
SA
Remarks
26
21
17
27
23
19
24
6
U4050B
GSA
SAO
CLISA
AGA
CK
VL
RDC
VC
1 (18)
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