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PDF U4091B Data sheet ( Hoja de datos )
| Número de pieza | U4091B | |
| Descripción | Programmable Telephone Audio Processor | |
| Fabricantes | TEMIC Semiconductors | |
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TELEFUNKEN Semiconductors
U4091B
Programmable Telephone Audio Processor
Description
The programmable telephone audio processor U4091B is
a linear integrated circuit for use in feature phones, an-
swering machines and fax machines. It contains the
speech circuit, tone ringer interface with dc/dc converter,
sidetone equivalent and ear protection rectifiers. The cir-
cuit is line powered and contains all components
necessary for amplification of signals and adaptation to
the line.
An integrated voice switch with loudspeaker amplifier al-
lows handsfree or loudhearing 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 Speech circuit with anti-clipping
D Tone ringer interface with dc / dc converter
D Speaker amplifier with anti-distortion
D Power supply management, regulated, unregulated
and a special supply for electret microphone
D Voice switch
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
ÁÁBUÁÁS
Audio
amplifier
Tone
ringer
Loudhearing
and
Tone ringing
MC with
EEPROM/
DTMF
Rev. A1: 12.07.1995
Preliminary Information
1 (11)
1 page  
TELEFUNKEN Semiconductors
U4091B
Electrical Characteristics
Wf = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 k , Tamb = 25°C,
WZear = 68 nF + 100 , ZM = 68 nF, unless otherwise specified.
Parameters
Test Conditions / Pin Symbol Min. Typ. Max.
DC characteristics
DC voltage drop over circuit IL = 2 mA
VL 2.4
IL = 14 mA
4.6 5.0 5.4
IL = 60 mA
7.5
IL = 100 mA
8.8 9.4 10.0
WTransmission amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 k , unless otherwise specified
Adjustment range of transmit
gain
GT 36
52
Transmitting amplification
Frequency response
wIL 14 mA,
"GT 47 48 49
DGT 0.5
Gain change with current
f = 300 to 3400 Hz
Pin 31 open
DGT
" 0.5
Gain deviation
IL = 14 to 100 mA
Tamb = – 10 to + 60 °C
DGT
" 0.5
CMRR of microphone
amplifier
Input resistance of MIC
amplifier
RGT = 12 kW
RGT = 27 kW
CMRR
Ri
60
45
80
50
75 110
Distortion at line
IL > 14 mA
VL = 700 mVrms
dt
2
Maximum output voltage
IL > 19 mA
d < 5%
VLmax
1.8
3
4.2
Vmic = 25 mV
CTXA = 1 mF
Noise at line psophomet-
rically weighted
Anti-clipping attack time
release time
Gain at low operating current
Distortion at low operating
current
Line loss compensation
Mute suppression
a) MIC muted (microphone
preamplifier
IL > 14 mA
GT = 48 dB
CTXA = 1 mF
each 3 dB overdrive
IL = 10 mA
IMP = 1
RDC =
mA
68 kW
Vmic = 1 mV
IM = 300 mA
IILM==13000mmAA
IMP = 1
RDC =
mA
68 kW
Vmic = 10 mV
wIL = 100 mA
IL 14 mA
Mutx = open
no
– 80 –72
0.5
9
GT 40
42.5
dt 5
DGTI
GTM
– 6.4 – 5.8 – 5.2
60 80
b) TXA muted (second
stage)
IMPSEL = open
GTTX
60
Unit
V
dB
dB
dB
dB
dB
dB
kW
%
dBm
dBmp
ms
dB
%
dB
dB
dB
Figure
Rev. A1: 12.07.1995
Preliminary Information
5 (11)
5 Page 
TELEFUNKEN Semiconductors
U4091B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
Rev. A1: 12.07.1995
Preliminary Information
11 (11)
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