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PDF ( 数据手册 , 数据表 ) U4087B

零件编号 U4087B
描述 Low Voltage Voice Switch Interface Circuit
制造商 TEMIC Semiconductors
LOGO TEMIC Semiconductors LOGO 


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U4087B 数据手册, 描述, 功能
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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. The detection
sensitivity and timing are externally controllable.
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
D Low voltage operation: 3.0 to 7.0 V
D Four point signal sensing
D Monitoring system for background noise level
D Case: SO 16
D Chip Disable for active/standby operation
Benefits
D Fast channel switching allows quasi duplex operation
D Low current consumption
Block Diagram
TLO2
16
15
TLI2
Logic
CPT
14
Noise
detector
VB VM CD GND
7 13 6 5
Bias
TLO1
2
Logic
1
TLI1
9
RLI2
Logic
– TS
=+
Logic
DIRE
+
+ DIRA
Charge
Discharge
C.T.
Generator
4
Logic
RLI1
8
RLO2
12 10 11
CT TLDR TLDT
3
RLO1
12610
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
Preliminary Information
1 (8)







U4087B pdf, 数据表
U4087B
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Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances ( ODSs).
The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and
forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban
on these substances.
TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of
continuous improvements to eliminate the use of ODSs listed in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency ( EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively.
TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain
such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized
application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of,
directly or indirectly, any claim of personal damage, injury or death associated with such unintended or
unauthorized use.
TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
8 (8) TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 09-Sep-96














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