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PDF U209B Data sheet ( Hoja de datos )
| Número de pieza | U209B | |
| Descripción | Monolithic Integrated Feature Phone Circuit | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Monolithic Integrated Feature Phone Circuit
U4090B
Description
The µc 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
Speech
circuit
Voice
switch
Audio
amplifier
Tone
ringer
Loudhearing
and
Tone ringing
MC with
EEPROM/
DTMF
94 8741
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
1 (34)
1 page  
Typical value of external components
C1 100 nF
C2 4.7 nF
C3 10 mF
C4 220 mF
C5 47 mF
C6 470 mF
C7 820 nF
C8 100 mF
C9 100 nF
C10 150 nF
C11 68 nF
C12 33 nF
C13 10 mF
C14 100 nF
C15 F1 m
C16 47 mF
C17 10 mF
C18
F10 m
C19 68 nF
C20 68 nF
C21 1 mF
C22 100 nF
C23 6.8 nF
C24 10 nF
C25 100 nF
C26 470 nF
C27 33 nF
L1 2.2 mH
R1 27 kW
R2 20 kW
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
U4090B
> 68 kW
10 W
1.5 kW
62 kW
680 kW
22 kW
330 W
3 kW
62 kW
30 kW
62 kW
120 kW
47 kW
1 kW
1.2 W
30 kW
6.8 kW
6.8 kW
15 kW
330 kW
220 kW
68 kW
2 kW
3.3 kW
18 kW
2 kW
1 kW
12 kW
56 kW
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
5 (34)
5 Page 
GT MICO TIN
INLDT
TLDT
STO VL
–
VBG +
TXA
U4090B
VL
ZL
Zint
SAO
GSA
SAI
SAI TLDR
94 8059
AFS
control
Max
att.
AGA
–
+ VBG
INLDR
RECO1 GR STIS
RECIN
STO
STN
Figure 6. Integration of acoustic feedback suppression circuit into the speech circuit environment
A detailed diagram of the AFS (acountic feedback order to produce the envelopes of the speech at TLDT and
suppression) is given in figure 10. Receive and Transmit RLDT. After amplification a decision is made by the
signals are first processed by logorithmic rectifiers in differential pair, which direction should be transmitted.
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
11 (34)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet U209B.PDF ] | |
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