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參數資料
| 型號： | U4084B |
| 英文描述： | Low-Voltage, Voice-Switched Circuit for Hands-Free Operation |
| 中文描述： | 低電壓，語音開關電路免提操作 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 544K |
| 代理商： | U4084B |
U4084B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 31-Jan-97
1 (26)
Low-Voltage, Voice-Switched Circuit for Hands-Free Operation
Description
The low-voltage, voice-switched speakerphone circuit
U4084B incorporates the features listed below. The ver-
satility of the device is further enhanced by giving access
to internal circuit points.
The block diagram shows amplifiers, level detectors,
transmit and receive attenuators operating in comple-
mentary functions, back ground noise monitors, chip
disable, dial tone detector and mute function etc.
Due to low-voltage operation, it can be operated either by
low supply voltage or via a telephone line requiring
4.0 mA typ. Further features are stand-alone operation
via a coupling transformer (Tip and Ring) or in
conjunction with a handset speech network, as shown in
figure 2.
Features
Low-voltage operation: 3.0 to 6.5 V
Attenuator gain range between
transmit and receive: 52 dB
Four-point signal sensing for improved sensitivity
Monitoring system for background-noise level
Microphone-amplifier gain adjustable
Mute function
Chip disable for active/ standby operation
Dial tone detector
Compatible with the speaker amplifier U4083B
Case: DIP24 or SO24
Benefits
Fast channel switching enables quasi duplex
operation
Low current consumption for high output volume
Optimized U3800BM interface
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| U4087B | Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone |
| U4087B-FP | Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone |
| U4090B-N | Low power dual voltage comparators |
| U4090B-NFN | Low power dual voltage comparators |
| U4090B-NFNG3 | Low power dual voltage comparators |
相關代理商/技術參數 |
參數描述 |
|---|---|
| U4084B-FL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Speakerphone Circuit |
| U4085B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Technische Daten Technical Data |
| U4087B | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone |
| U4087B-FP | 制造商:TEMIC 制造商全稱:TEMIC Semiconductors 功能描述:Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone |
| U4089B | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT |
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