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PDF ( 数据手册 , 数据表 ) U4090B-FN

零件编号 U4090B-FN
描述 Monolithic Integrated Feature Phone Circuit
制造商 ATMEL Corporation
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U4090B-FN 数据手册, 描述, 功能
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)







U4090B-FN pdf, 数据表
U4090B
DC line interface and supply voltage generation
The DC line interface consists of an electronic inductance
and a dual port output stage, which charges the capacitors
at VMPS and VB. The value of the equivalent inductance
is given by
L = RSENSE @ CIND @ (RDC @ R30) / (RDC + R30)In
order to improve the supply during worst case operating
conditions two PNP current sources - IBOPT and
IMPSOPT - hand an extra amount of current to the supply
voltages, when the NPNs in parallel are unable to conduct
current.
A flowchart for the control of the current sources
(figure 5) shows, how a priority for supply VMPS is
achieved.
WVL 10 SENSE
RSENSE
CIND
10 mF
IBOPT
< 5 mA
IND
RDC
+
30 kW
R30
= VOFFS
IMPSOPT
< 5 mA
=
+
3.3 V
+
6.3 V VMPS
VMP
3.3 V/
2 mA
470m F
47 mF
m7.0 V VB 220 F
94 8047
Figure 4. DC line interface with electronic inductance and generation of a regulated and an unregulated supply
VMPS < 6.3 V
Y VSENSE–VMPS>200 mV
NN
Y N IMPSOPT = 0
VSENSE–VB>200 mV
IBOPT = 0
Y
VB < 6.3 V
N
Y
Charge CMPS
(IMPSOPT)
Charge CB
(IBOPT)
Reduce IBOPT
(IMPSOPT = 0)
94 8058
Figure 5. Supply capacitors CMPS and CB are charged with priority on CMPS
8 (34)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. C1, 28-Oct-96







U4090B-FN equivalent, schematic
U4090B
Parameters
Test Conditions / Pin Symbol Min Typ Max
Distortion at low operating
current
IL = 10 mA
IM = 300 mA
IMP = 1 mA
RDC = 68 kW
Vmic = 10 mV
dt
5
Line loss compensation
Mute suppression
a) MIC muted (microphone
preamplifier
IL = 100 mA,
RAGA = 20 kW
wIL 14 mA
Mutx = open
DGTI
GTM
– 6.4 – 5.8 – 5.2
60 80
b) TXA muted (second
stage)
IMPSEL = open
GTTX
60
wReceiving amplifier, IL = 14 mA, RGR = 62 k, unless otherwise specified, VGEN = 300 mV
IL 14 mA, single
Adjustment range of
receiving gain
ended
differential MUTR =
GR
–8
–2
+2
+8
GND
Receiving amplification
RGR = 62 kW
differential
RGR = 22 kW
differential
–1
GR – 1.75
– 0.25
7.5
wAmplification of DTMF sig-
nal from DTMF IN to
RECO 1, 2
IL 14 mA
VMUTX = VMP
GRM 7 10 13
Frequency response
Gain change with current
Gain deviation
Ear protection differential
MUTE suppression
a) RECATT
b) RA2
c) DTMF operation
vOutput voltage d 2%
differential
IL > 14 mA,
f = 300 to 3400 Hz
IL = 14 to 100 mA
wTamb = –10 to +60°C
IL 14 mA
wVGEN = 11 Vrms
IL 14 mA
MUTR = open
VMUTR = VMP
VMUTX = VMP
IL = 14 mA
Zear = 68 nF + 100 W
DGRF
DGR
DGR
EP
DGR
60
0.775
" 0.5
" 0.5
" 0.5
2.2
vMaximum output current
d 2%
Zear = 100 W
4
Receiving noise
psophometrically weigthed
Output resistance
wZear = 68 nF + 100 W
IL 14 mA
each output against
GND
ni
Ro
– 80 – 77
10
Line loss compensation
Gain at low operating cur-
rent
RAGA = 20 kW,
IL = 100 mA
IL = 10 mA
IMP = 1 mA
IM = 300 mA
VGEN = 560 mV
RDC = 68 kW
DGRI
– 7.0 – 6.0 – 5.0
GR – 2 – 1 0
Unit
%
dB
dB
dB
dB
dB
dB
dB
dB
dB
Vrms
dB
Vrms
mA
(peak)
dBmp
W
dB
dB
Figure
28
28
28
28
27
27
27
27
27
27
27
27
27
27
27
27
27
16 (34)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. C1, 28-Oct-96










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