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參數資料
| 型號： | U2090B |
| 廠商： | Atmel Corp. |
| 英文描述： | Monolithic Integrated Feature Phone Circuit |
| 中文描述： | 單片電路的集成功能手機 |
| 文件頁數： | 1/34頁 |
| 文件大?。?/td> | 677K |
| 代理商： | U2090B |
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U4090B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
1 (34)
Monolithic Integrated Feature Phone Circuit
Description
The
μ
c controlled telephone circuit U4090B is a linear
integrated circuit for use in feature phones, answering
machines and fax machines. It contains the speech circuit,
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
DC characteristic adjustable
Transmit and receive gain adjustable
Symmetrical input of microphone amplifier
Anti-clipping in transmit direction
Automatic line loss compensation
Symmetrical output of earpiece amplifier
Built-in ear protection
DTMF and MUTE input
Adjustable sidetone suppression independent
of sending and receiving amplification
Speech circuit with two sidetone networks
Built-in line detection circuit
Integrated amplifier for loudhearing operation
Anti-clipping for loudspeaker amplifier
Improved acoustical feedback suppression
Power down
Voice switch
Tone ringer interface with dc/dc converter
Zero crossing detection
Common speaker for loudhearing and tone ringer
Supply voltages for all functional blocks of a
subscriber set
Integrated transistor for short circuiting the line
voltage
Answering machine interface
Operation possible from 10 mA line currents
Benefits
Savings of one piezo electric transducer
Complete system integration of analog signal proces-
sing on one chip
Very few external components
Applications
Feature phone, answering machine, fax machine, speaker
phone
MC with
EEPROM/
DTMF
Audio
amplifier
Speech
circuit
Voice
switch
Tone
ringer
Loudhearing
and
Tone ringing
94 8741
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