U4090B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U4090B
기능 Monolithic Integrated Feature Phone Circuit
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U4090B 데이터시트, 핀배열, 회로
Monolithic Integrated Feature Phone Circuit
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
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
D Answering machine interface
D Operation possible from 10 mA line currents
D Savings of one piezo electric transducer
D Complete system integration of analog signal proces-
sing on one chip
D Very few external components
Feature phone, answering machine, fax machine, speaker
Tone ringing
MC with
94 8741
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
1 (34)

U4090B pdf, 반도체, 판매, 대치품
4 (34)
Figure 3. Application for handsfree operation
TELEFUNKEN Semiconductors
Preliminary Information
Rev. C1, 28-Oct-96


U4090B 전자부품, 판매, 대치품
Pin Symbol
17 VRING Input for ringing signal protected by
internal zener diode
18 THA Threshold adjustment for ringing
frequency detector
19 RFDO Output of ringing frequency detector
20 LIDET Line detect; output is low when the
line current is more than 15 mA
21 IMP- Control input for selection of line
SEL impedance
1. 600
2. 900
3. Mute of second transmit stage
(TXA); also used for indication of
external supply (answering machine);
last chosen impedance is stored
22 TSACL Time constant of anti-clipping of
speaker amplifier
23 GSA Current input for setting the gain of
the speaker amplifier,
adjustment characteristic is
or RGSA > 2 MΩ, the speaker
amplifier is switched off
24 SA I Speaker amplifier input (for
loudspeaker, tone ringer and
handsfree use)
25 MUTX Three state input of transmit mute:
1) Speech condition; inputs MIC1 /
MIC2 active
2) DTMF condition; input DTMF
a part of the input signal is
passed to the receiving amplifier
as a confidence signal during
3) Input DTMF used for answering
machine and handsfree use;
receive branch not affected
26 ATAFS Attenuation of acoustical feedback
maximum attenuation of AFS circuit
is set by a resistor at this pin,
without the resistor, AFS is switched
27 INLDT Input of transmit level detector
28 INLDR Input of receive level detector
Pin Symbol
29 TLDT Time constant of transmit level
30 TLDR Time constant of receive level
31 AGA Automatic gain adjustment with line
a resistor connected from this pin to
GND sets the starting point
max. gain change: 6 dB.
32 IREF Internal reference current generation;
RREF = 62 k; IREF = 20 µA
33 STO Side tone reduction output
output resistance is approx. 300 ,
maximum load impedance: 10 kΩ.
34 VM Reference node for microphone-
earphone and loudspeaker amplifier,
msupply for electret microphone
(IM 700 A)
35 MUTR Three state mute input
1. Normal operation
2. Mute of ear piece
3. Mute of RECIN signal
Condition of earpiece mute is stored
36 RECO 2 Inverting output of receiving
37 STI S Input for side tone network (short
loop) or for answering machine
38 STI L Input for side tone network (long
39 RAC Input of receiving amplifier for ac
coupling in feedback path
40 RECO 1 Output of receiving amplifier
41 GR A resistor connected from this pin to
GND sets the receiving amplification
of the circuit; amplifier RA1 can be
muted by applying VMP to GR
42 TTXA Time constant of anticlipping in
transmit path
W43 RECIN Input of receiving path; input
impedance is typically 80 k
44 TXIN Input of intermediate transmit stage,
input resistance is typically 20 k
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
Preliminary Information
7 (34)


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전력 반도체 판매 ( IGBT, TR 모듈, SCR, 다이오드 모듈 )

상호 : 아이지 인터내셔날

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관련 데이터시트

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Monolithic Integrated Feature Phone Circuit

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Monolithic Integrated Feature Phone Circuit

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