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參數資料
| 型號： | U4087B |
| 英文描述： | Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone |
| 中文描述： | 低壓開關接口電路的語音免提電話的自由運作中 |
| 文件頁數： | 1/8頁 |
| 文件大?。?/td> | 115K |
| 代理商： | U4087B |
U4087B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
1 (8)
Low Voltage Voice Switch Interface Circuit for Hands-free
Operation in Telephone
Description
The voice switch interface circuit U4087B is a linear
integrated circuit for improvement of handsfree
performance of U4090B system.
The U4087B provides an optimized interface to U4090B,
the necessary level detectors and switching control for a
properly
operating
speakerphone.
sensitivity and timing are externally controllable.
The
detection
Additionally, the U4087B provides a back- ground noise
monitor which makes the circuit insensitive to room
noise.
The Block diagram shows level detectors, back ground
noise monitor.
Due to low voltage operation it can be operated via power
supply management of U4090B requiring 1.0 mA typ.
Features
Low voltage operation: 3.0 to 7.0 V
Four point signal sensing
Monitoring system for background noise level
Case: SO 16
Chip Disable for active/standby operation
Benefits
Fast channel switching allows quasi duplex operation
Low current consumption
Block Diagram
Bias
Noise
detector
7
13
6
5
TS
–
+
=
14
+
–
Logic
15
Logic
16
C.T.
Generator
Charge
DIRA
Discharge
Logic
9
–
+
DIRE
2
Logic
Logic
1
4
10
11
12
CT
8
12610
TLO2
CPT
VB
VM
CD GND
TLO1
TLI1
RLI1
3
TLDR
TLDT
RLO1
RLO2
RLI2
TLI2
Figure 1. Block diagram with external circuit
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| U4090B-P | Low power dual voltage comparators |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| U4089B-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT |
| U4089B-MFN | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT |
| U4089B-MFNG3 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT |
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