u4087b-fp ETC-unknow, u4087b-fp Datasheet

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u4087b-fp

Manufacturer Part Number
u4087b-fp
Description
Voltage Voice Switch Interface Circuit Hands-free Operation Telephone
Manufacturer
ETC-unknow
Datasheet
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
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
sensitivity and timing are externally controllable.
Features
D
D
D
D
D
Block Diagram
TLI2
RLI2
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
15
9
operating
Logic
Logic
TLO2
16
speakerphone.
RLO2
8
detector
Noise
+
=
Preliminary Information
Figure 1. Block diagram with external circuit
The
CPT
14
+
detection
DIRA
TS
Charge
VB
CT
7
12
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.
Benefits
D
D
Generator
VM CD GND
Logic
TLDR
Bias
Fast channel switching allows quasi duplex operation
Low current consumption
C.T.
13
10
6
TLDT
Discharge
5
11
DIRE
+
RLO1
TLO1
2
3
Logic
Logic
U4087B
12610
1
4
RLI1
TLI1
1 (8)

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u4087b-fp Summary of contents

Page 1

... 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 ...

Page 2

... U4087B Figure 2. Application for hands-free operation 2 (8) Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 ...

Page 3

... Figure 3. Application for handsfree operation TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 Preliminary Information U4087B 3 (8) ...

Page 4

... U4087B Typical Value of External Components C 100 4 220 470 820 100 100 150 100 ...

Page 5

... Pin 6 – 0 Pin 13 – 0 – 150 stg – amb tot thJA Symbol Min. Pin – 20 amb U4087B Value Unit 125 C C 750 mW 110 K/W Typ. Max. Unit – 7.0 V – – ...

Page 6

... T Level detectors and background noise monitor Source current at RLO1, RLO2, TLO1, TLO2 Sink current at RLO1, RLO2, TLO1, TLO2 CPT output resistance CPT leakage current Ordering Information Type U4087B-FP 6 (8) Preliminary Information unless otherwise specified , Symbol Min 6 50 2.0 CDH V 0 ...

Page 7

... Dimensions in mm Package: SO16 TELEFUNKEN Semiconductors Rev. A1, 09-Sep-96 Preliminary Information U4087B 94 8875 7 (8) ...

Page 8

... U4087B 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 ...

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