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Электронный компонент: U4090B

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U4090B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
1 (34)
Monolithic Integrated Feature Phone Circuit
Description
The
c controlled telephone circuit U4090B 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
loudhearing 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 Symmetrical output of earpiece amplifier
D Built-in ear protection
D DTMF and MUTE input
D Adjustable sidetone suppression independent
of sending and receiving amplification
D Speech circuit with two sidetone networks
D Built-in line detection circuit
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 proces-
sing 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
U4090B
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
2 (34)
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
LIDET
V
RING
C
OSC
SW
OUT
RFDO
THA
RECIN
STIS
STIL
RAC
GR
RECO2
RECO1
MUTR
MUTX
GSA
MIC1
MIC2
DTMF
TTXA
INLDR
TLDR
A
T
AFS
SAO
TSACL
SAI
MIC
TX
ACL
Acoustical
feedback
suppression
control
T
ransmit
mute
control
SACL
Mute
receive
control
Impedance
control
Power
supply
Current
supply
I Supply
Line
detect
AGA
control
I L
Receive
attenuation
V
L
+
+
V
MP
ST
BAL
TXA
94 8064
Q
S
INLDT
TLDT
1
600
W
900
W
+
+
1
2
6
4
12
5
7
8
9
11
10
3
16
15
23
22
24
25
26
20
27
21
19
14
13
28
31
30
29
38
37
36
33
35
34
32
42
39
41
40
43
44
17
18
DTMF
RA1
RA2
SA
SAI
Figure 1.
U4090B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
3 (34)
R
1
C
1
to STIN
1
3
44
33
R
2
21
31
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
34
9
R
6
6
32
C
7
R
5
m
20
17
16
15
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
42
C
21
28
27
R
20
R
19
C
20
C
19
RECO
MICO
30
29
C
18
C
17
26
R
31
C
16
12
22
C
15
24
C
14
R
14
R
13
23
25
35
R
11
36
40
41
39
C
13
R
10
38
R
9
R
8
37
V
M
ST
O
STIN 2
(Option)
C
12
C
11
C
10
V
L
R
15
R
16
R
17
Micro
controller
V
MP
94 8849
U4090B
Ti
p
Ring
43
hook switch
V
M
V
M
V
M
Earpeace
Loud-
speaker
R
12
C
3
Figure 2. Application circuit for loudhearing
U4090B
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
4 (34)
R
1
C
1
to STIN
1
3
44
33
R
2
21
31
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
34
9
R
6
6
32
C
7
hook switch
R
5
20
17
16
15
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
42
C
21
28
27
R
30
R
29
C
27
C
26
RECO
LOGTX
30
29
26
C
16
12
22
C
15
24
C
14
R
14
R
12
23
25
35
R
11
36
40
41
39
C
13
R
10
V
M
38
R
9
R
8
37
V
M
STIN 2
(Option)
C
12
C
11
C
10
V
L
V
M
R
15
R
16
R
17
Micro
controller
V
MP
94 8850
U4090B
Ti
p
Ring
43
BC177
STN
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
Figure 3. Application for handsfree operation
U4090B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
5 (34)
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
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