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U4092B PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 U4092B
기능 Monolithic Integrated Feature Phone Circuit
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U4092B 데이터시트, 핀배열, 회로
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TELEFUNKEN Semiconductors
Monolithic Integrated Feature Phone Circuit
U4092B
Description
The µc controlled telephone circuit U4092B 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 loud-
hearing 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 Built-in ear protection
D DTMF and MUTE input
D Adjustable sidetone suppression independent
of sending and receiving amplification
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
processing 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
Rev. A1: 24.01.1995
Preliminary Information
1




U4092B pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
U4092
TELEFUNKEN Semiconductors
Figure 3 Application for handsfree operation
4
Preliminary Information
Rev. A1: 24.01.1995

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U4092B 전자부품, 판매, 대치품
www.DataSheet4U.com
TELEFUNKEN Semiconductors
Pin Symbol
Function
17 VRING Input for ringing signal
18 THA Threshold adjustment for ringing
frequency detector
19 RFDO Output of ringing frequency detector
20 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.
21 TSACL Time constant of anticlipping of
speaker amplifier
22 GSA Current input for setting the gain of
the speaker amplifier. Adjustment
characteristic is logarithmical. For
RGSA > 2 MΩ, the speaker
amplifier is switched off.
23 SA I Speaker amplifier input (for
loudspeaker, tone ringer and
handsfree use)
24 MUTX Three state input of transmit mute:
1) Speech condition; inputs MIC1 /
MIC2 active
2) DTMF condition; input DTMF
active. A part of the input signal is
passed to the receiving amplifier as a
confidence signal during dialing.
3) Input DTMF used for answering
machine and handsfree use; receive
branch not affected.
25 ATAFS Attenuation of acoustical feedback
suppression. Maximum attenuation
of AFS circuit is set by a resistor at
this pin. Without the resistor, AFS is
switched off.
26 INLDT Input of transmit level detector
27 INLDR Input of receive level detector
U4092B
Pin Symbol
Function
29 TLDT Time constant of transmit level
detector
29 TLDR Time constant of receive level
detector
30 AGA Automatic gain adjustment with line
current. A resistor connected from
this pin to GND sets the starting
point. Max. gain change is 6 dB.
31 IREF Internal reference current
generation; RREF = 62 k; IREF =
20 µA
32 STO Side tone reduction output. Output
resistance is approximately 300 .
Maximum load impedance is 10 kΩ.
33 VM Reference node for
microphone-earphone and
loudspeaker amplifier. Supply for
electret microphone (IM 300 m A).
34 RECO Output of receiving
amplifier
35 STI Input for side tone network
36 RAC Input of receiving amplifier for ac
coupling in feedback path
37 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
38 TTXA Time constant of anticlipping in
transmit path
39 RECIN Input of receiving path; input
impedance is typically 80 kW
40 TXIN Input of intermediate transmit stage,
input resistance is typically 20 k
Rev. A1: 24.01.1995
Preliminary Information
7

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부품번호상세설명 및 기능제조사
U4092B

Monolithic Integrated Feature Phone Circuit

TEMIC Semiconductors
TEMIC Semiconductors

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