Datenblatt-pdf.com


U209B Schematic ( PDF Datasheet ) - ATMEL Corporation

Teilenummer U209B
Beschreibung Monolithic Integrated Feature Phone Circuit
Hersteller ATMEL Corporation
Logo ATMEL Corporation Logo 




Gesamt 30 Seiten
U209B Datasheet, Funktion
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)






U209B Datasheet, Funktion
U4090B
GT 1
44 TXIN
DTMF 2
43 RECIN
MICO 3
MIC2 4
42 TTXA
41 GR
MIC1 5
40 RECO1
PD 6
39 RAC
IND 7
38 STIL
VL 8
37 STIS
GND 9
36 RECO2
SENSE 10
VB 11
U4090B
SAO 12
35 MUTR
34 VM
33 STO
VMPS 13
32 IREF
VMP 14
31 AGA
SWOUT 15
30 TLDR
COSC 16
29 TLDT
VRING 17
28 INLDR
THA 18
27 INLDT
RFDO 19
LIDET 20
26 ATAFS
25 MUTX
IMPSEL 21
24 SAI
TSACL 22
23 GSA
94 7905 e
Pin Description
Pin Symbol
Function
1 GT A resistor from this pin to GND sets the
amplification of microphone and DTMF
signals, the input amplifier can be muted
by applying VMP to GT.
2 DTMF Input for DTMF signals,
also used for the answering machine
and handsfree input
3 MICO Output of microphone preamplifier
4 MIC 2 Non-inverting input of microphone
amplifier
5 MIC 1 Inverting input of microphone
amplifier
6 PD Active high input for reducing the
current consumption of the circuit,
simultaneously VL is shorted by an
internal switch
7 IND The internal equivalent inductance of
the circuit is proportional to the value
of the capacitor at this pin,
a resistor connected to ground may be
used to reduce the dc line voltage
8 VL Line voltage
9 GND Reference point for dc- and ac-output
signals
10 SENSE A small resistor (fixed) connected
from this pin to VL sets the slope of
the dc characteristic and also effects
the line length equalization
characteristics and the line current at
which the loudspeaker amplifier is
switched on
11 VB Unregulated supply voltage for
peripheral circuits (voice switch),
limited to typically 7 V
12 SAO Output of loudspeaker amplifier
13 VMPS Unregulated supply voltage for µP,
limited to 6.3 V
14 VMP Regulated supply voltage 3.3 V for
peripheral circuits (especially
microprocessors),
minimum output current: 2 mA
(ringing)
4 mA (speech mode)
15 SWOUT Output for driving external switching
transistor
16 COSC 40 kHz oscillator for ringing power
converter
6 (34)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. C1, 28-Oct-96

6 Page









U209B pdf, datenblatt
U4090B
TLDT
TXA
SAI
TX RLDT
INLDT
RX RLDR
INLDR
94 8060
IAT
IATAFS
AGA
IAGAFS
AGA
IGSA
TLDR
IATGSA
ATAFS
RATAFS
GSA
Figure 7. Accoustic feedback suppression by alternative control of transmit- and speaker amplifier gain
The attenuation of the controlled amplifiers TXA and SAI
is determined by the emitter current IAT, which is com-
prised of three parts:
IATAS
IATGSA
IAGAFS
sets maximum attenuation
decreases the attenuation, when speaker
amplifier gain is reduced
decreases the attenuation according to the
loop gain reduction caused by the AGA–
function
IAT = IATAFS - IATGSA - IAGAFS
DG = IAT * 0.67 dB/ mA
Figure 11 illustrates the principal relationship between
speaker amplifier gain (GSA) and attenuation of AFS
(ATAFS). Both parameters can be adjusted
independently, but the internal coupling between them
has to be considered. Maximum usable value of GSA is
36 dB. The shape of the characteristic is moved in the
x-direction by adjusting resistor RATAFS, thus changing
ATAFSm. The actual value of attenuation (ATAFSa),
however, can be determined by reading the value which
belongs to the actual gain GSAa. If the speaker amplifier
gain is reduced, the attenuation of AFS is automatically
reduced by the same amount, in order to achieve a
vconstant loop gain. Zero attenuation is set for speaker
gains GSA GSA0 = 36 dB - ATAFSm.
12 (34)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. C1, 28-Oct-96

12 Page





SeitenGesamt 30 Seiten
PDF Download[ U209B Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
U2090BMonolithic Integrated Feature Phone CircuitATMEL Corporation
ATMEL Corporation
U209BMonolithic Integrated Feature Phone CircuitATMEL Corporation
ATMEL Corporation
U209B3Phase Control Circuit - Tacho ApplicationsTEMIC Semiconductors
TEMIC Semiconductors
U209B3-FPPhase Control Circuit - Tacho ApplicationsTEMIC Semiconductors
TEMIC Semiconductors

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche