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Электронный компонент: U4092B

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U4092B
TELEFUNKEN Semiconductors
Preliminary Information
1
Rev. A1: 24.01.1995
Monolithic Integrated Feature Phone Circuit
Description
The
c controlled telephone circuit U4092B is a linear
integrated circuit for use in feature phones, answering
machines and fax machines. It contains the speech circuit,
tone ringer interface with dc/dc converter, sidetone
equivalent and ear protection rectifiers. The circuit is line
powered and contains all components necessary for
amplification of signals and adaptation to the line.
An integrated voice switch with loudspeaker amplifier
allows loudhearing or handsfree operation. With an
anti-feedback function, acoustical feedback during loud-
hearing can be reduced significantly. The generated supply
voltage is suitable for a wide range of peripheral circuits.
Features
D DC characteristic adjustable
D Transmit and receive gain adjustable
D Symmetrical input of microphone amplifier
D Anti-clipping in transmit direction
D Automatic line loss compensation
D Built-in ear protection
D DTMF and MUTE input
D Adjustable sidetone suppression independent
of sending and receiving amplification
D Integrated amplifier for loudhearing operation
D Anti-clipping for loudspeaker amplifier
D Improved acoustical feedback suppression
D Power down
D Voice switch
D Tone ringer interface with dc/dc converter
D Zero crossing detection
D Common speaker for loudhearing and tone ringer
D Supply voltages for all functional blocks of a subscriber
set
D Integrated transistor for short circuiting the line voltage
D Answering machine interface
D Operation possible from 10 mA line currents
Benefits
D Savings of one piezo electric transducer
D Complete system integration of analog signal
processing on one chip
D Very few external components
Applications
Feature phone, answering machine, fax machine, speaker
phone
MC with
EEPROM/
DTMF
Audio
amplifier
Speech
circuit
Voice
switch
Tone
ringer
Loudhearing
and
Tone ringing
94 8741
TELEFUNKEN Semiconductors
U4092
Rev. A1: 24.01.1995
Preliminary Information
2
Block diagram
GT
MICO
TXIN
ST
O
V
L
IMPSEL
AGA
IND
SENSE
V
B
V
MP
V
MPS
V
M
GND
PD
I REF
V
RING
C
OSC
SW
OUT
RF
DO
THA
RECIN
STI
RAC
GR
RECO
MUTX
GSA
MIC1
MIC2
DTMF
TTXA
INLDR
TLDR
TLDT
A
T
AFS
SAO
TSACL
SAI
INLDT
MIC
TX
ACL
Acoustical
feedback
suppression
control
T
ransmit
mute
control
SACL
Imped
control
Power
supply
Current
supply
Supply
AGA
control
R
attenuation
V
L
+
+
V
MP
TXA
94 8896
T
S
37
16
6
9
18
22
19
34
14
11
13
31
15
33
17
32
1
8
38
36
10
39
24
30
20
7
12
35
23
21
25
29
26
27
2
4
5
28
40
3
Figure 1
U4092B
TELEFUNKEN Semiconductors
Preliminary Information
3
Rev. A1: 24.01.1995
R
1
C
1
1
3
40
32
R
2
20
30
7
R
3
R
4
10
8
C
4
C
5
C
6
1
1
14
13
13 V
to C
C
8
V
M
33
9
R
6
6
31
C
7
R
5
m
17
16
15
28 V
C
9
L
1
Q
1
19
R
7
Micro
phone
R
28
C
2
R
27
C
22
DTMF
Generator
18
5
4
2
38
C
21
27
26
R
20
R
19
C
20
C
19
RECO
MICO
29
28
C
18
C
17
25
R
31
C
16
12
21
C
15
23
C
14
R
14
R
13
22
24
34
37
36
C
13
R
10
35
R
9
R
8
V
M
C
12
C
11
C
10
V
L
R
15
R
16
R
17
Micro
controller
V
MP
94 8849
U4092B
Ti
p
Ring
39
hook switch
V
M
V
M
V
M
Earpeace
Loud-
speaker
R
12
C
3
to pin 32
C
28
Figure 2 Application circuit for loudhearing
TELEFUNKEN Semiconductors
U4092
Rev. A1: 24.01.1995
Preliminary Information
4
R
1
C
1
1
3
40
32
R
2
20
30
7
R
3
R
4
10
8
C
4
C
5
C
6
1
1
14
13
13 V
to C
C
8
V
M
33
9
R
6
6
31
C
7
hook switch
R
5
17
16
15
28 V
C
9
L
1
Q
1
19
R
7
Micro
phone
R
26
C
2
V
M
R
25
C
23
DTMF
18
5
4
2
38
C
21
27
26
R
30
R
29
C
27
C
26
RECO
LOGTX
29
28
25
C
16
12
21
C
15
23
C
14
R
14
R
12
22
24
R
11
34
37
36
C
13
R
10
V
M
35
R
9
R
8
V
M
C
12
C
11
C
10
V
L
V
M
R
15
R
16
R
17
Micro
controller
V
MP
94 8850
U4092B
Ti
p
Ring
39
BC177
to pin 32
LOGTX
Loud
speaker
Earpiece
R
24
R
23
R
22
R
18
R
13
R
21
C
25
C
24
C
18
C
17
C
3
V
B
m
HFMic
C
28
Figure 3 Application for handsfree operation
U4092B
TELEFUNKEN Semiconductors
Preliminary Information
5
Rev. A1: 24.01.1995
Typical value of external components
C
1
100 nF
C
2
4.7 nF
C
3
10
mF
C
4
220
mF
C
5
47
mF
C
6
470
mF
C
7
820 nF
C
8
100
mF
C
9
100 nF
C
10
150 nF
C
11
68 nF
C
12
33 nF
C
13
10
mF
C
14
100 nF
C
15
1
mF
C
16
47
mF
C
17
10
mF
C
18
10
mF
C
19
68 nF
C
20
68 nF
C
21
1
mF
C
22
100 nF
C
23
6.8 nF
C
24
10 nF
C
25
100 nF
C
26
470 nF
C
27
33 nF
C
28
10
mF
L
1
2.2 mH
R
1
27 k
W
R
2
20 k
W
R
3
> 68 k
W
R
4
10
W
R
5
1.5 k
W
R
6
62 k
W
R
7
680 k
W
R
8
22 k
W
R
9
330
W
R
10
3 k
W
R
11
62 k
W
R
12
30 k
W
R
13
62 k
W
R
14
120 k
W
R
15
47 k
W
R
16
1 k
W
R
17
1.2
W
R
18
30 k
W
R
19
6.8 k
W
R
20
6.8 k
W
R
21
15 k
W
R
22
330 k
W
R
23
220 k
W
R
24
68 k
W
R
25
2 k
W
R
26
3.3 k
W
R
27
18 k
W
R
28
2 k
W
R
29
1 k
W
R
30
12 k
W
R
31
56 k
W