U4087B-FP [TEMIC]
Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone; 低电压语音交换机接口电路免提操作的电话
| 型号： | U4087B-FP |
| 厂家： | 
TEMIC SEMICONDUCTORS |
| 描述： | Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone |
| 文件： | 总8页 (文件大小：109K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U4087B
Low Voltage Voice Switch Interface Circuit for Hands-free
Operation in Telephone
Description
The voice switch interface circuit U4087B is a linear Additionally, the U4087B provides a back- ground noise
integrated circuit for improvement of handsfree monitor which makes the circuit insensitive to room
performance of U4090B system.
noise.
The Block diagram shows level detectors, back ground
noise monitor.
The U4087B provides an optimized interface to U4090B,
the necessary level detectors and switching control for a
properly operating speakerphone. The detection Due to low voltage operation it can be operated via power
sensitivity and timing are externally controllable. supply management of U4090B requiring 1.0 mA typ.
Features
Benefits
Low voltage operation: 3.0 to 7.0 V
Fast channel switching allows quasi duplex operation
Low current consumption
Four point signal sensing
Monitoring system for background noise level
Case: SO 16
Chip Disable for active/standby operation
Block Diagram
TLO2
CPT
14
VB VM CD GND
TLO1
2
16
7
13
6
5
1
15
Noise
detector
TLI2
Logic
Logic
TLI1
Bias
TS
–
+
DIRE
=
–
+
Logic
DIRA
+
–
Charge
Discharge
11
9
4
C.T.
Generator
Logic
Logic
RLI1
RLI2
8
12
CT
10
3
12610
RLO2
TLDR TLDT
RLO1
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
1 (8)
Rev. A1, 09-Sep-96
Preliminary Information
U4087B
Figure 2. Application for hands-free operation
2 (8)
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
Preliminary Information
U4087B
Figure 3. Application for handsfree operation
TELEFUNKEN Semiconductors
3 (8)
Rev. A1, 09-Sep-96
Preliminary Information
U4087B
Typical Value of External Components
C1
100 nF
4.7 nF
10 F
220 F
47 F
470 F
820 nF
100 F
100 nF
150 nF
68 nF
33 nF
10 F
100 nF
1 F
R3
> 68 k
10
C2
R4
C3
R5
1.5 k
62 k
680 k
22 k
330
C4
R6
C5
R7
C6
R8
C7
R9
C8
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R31
3 k
C9
62 k
30 k
62 k
120 k
47 k
1 k
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
C25
L1
1.2
47 F
10 F
10 F
68 nF
68 nF
1 F
30 k
6.8 k
6.8 k
15 k
330 k
220 k
68 k
2 k
100 nF
6.8 nF
10 nF
100 nF
2.2 mH
27 k
3.3 k
18 k
2 k
R1
R2
20 k
56 k
4 (8)
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
Preliminary Information
U4087B
Pin Description
Pin
1
Symbol
TLI1
TLO1
RLO1
RLI1
GND
CD
Function
Transmit level detector input on the line side
2
Transmit level detector output on the line side
Receive level detector output on the line side
Receive level detector input on the line side
Ground
3
4
5
6
Chip Disable
A logic low (< 0.8 V) sets normal operation. A logic high (> 2.0 V) disables the IC to con-
serve power. Input impedance is nominally 90 k .
7
8
V
Supply voltage 2.8 to 7.0 V, approx. @ 1 mA
Receive level detector output on the microphone/speaker side
Receive level detector input on the microphone/speaker side
Positive control output for U4090B
B
RLO2
RLI2
9
10
11
12
TLDR
TLDT
Negative control output for U4090B
C
T
Response time
An RC at this pin sets the response time for the circuit to switch modes
13
14
15
16
V
It is a system ac ground, supplied by U4090B, V
VB/2
M
M
CPT
An RC at this pin sets the time constant for the transmit background monitor
Transmit level detector input on the microphone/speaker side
TLI2
TLO2
Transmit level detector output on the microphone/speaker side, and input to the transmit
background monitor
Absolute Maximum Ratings
Reference point Pin 1, T
= 25°C, unless otherwise specified
amb
Parameters
Symbol
Value
Unit
V
Supply voltage
Voltages:
Pin 7
V
B
– 0.3 to + 12
Pin 6
– 0.3 to 6
Pin 13
– 0.3 to (V + 0.3)
V
B
Storage temperature range
Junction temperature
T
– 55 to + 150
125
°C
°C
°C
stg
T
j
Ambient temperature range
Power dissipation
T
amb
– 20 to + 60
T
= 60 °C
SO 16
SO 16
P
750
110
mW
amb
tot
Maximum thermal resistance
Junction ambient
R
thJA
K/W
Operation Recommendation
Parameters
Supply voltage
Test conditions / Pin
Pin 7
Symbol
Min.
Typ.
Max.
7.0
Unit
V
B
3.0
0
–
–
–
V
V
CD input Pin 6
V
B
Ambient temperature range
T
amb
– 20
+ 60
°C
TELEFUNKEN Semiconductors
5 (8)
Rev. A1, 09-Sep-96
Preliminary Information
U4087B
Electrical Characteristics
T
amb
= + 25°C, V = 5.0 V, CD 0.8 V unless otherwise specified
S
,
Parameters
Test conditions / Pin
Symbol
Min.
50.0
Typ.
Max.
Unit
Power supply
Supply current
V = 6.5 V, CD = 0.8 V
V = 6.5 V, CD = 2.0 V
I
1.0
60.0
2.0
150.0
mA
A
B
B
B
CD input resistance
CD input voltage
V = V = 6.5 V
R
CD
90.0
k
B
CD
– High
– Low
V
CDH
2.0
0.0
V
B
V
V
CDL
0.8
Attenuator control
C voltage
T
Pin 12 – V
R mode
V
CT
M
+ 240.0
0.0
– 240.0
Idle mode
T mode
mV
C source current
R mode
T mode
I
– 85.0
+ 40.0
– 60.0
+ 60.0
0.0
– 40.0
+ 85.0
A
A
A
T
CTR
C sink current
T
I
CTT
C idle current
T
I
CTS
Level detectors and background noise monitor
Source current
at RLO1, RLO2, TLO1,
TLO2
I
I
– 2.0
4.0
mA
A
LSO
LSK
Sink current
at RLO1, RLO2, TLO1,
TLO2
CPT output resistance
CPT leakage current
I = 1.0 mA
O
R
100
CP
I
– 0.2
A
CPLK
Ordering Information
Type
Package
U4087B-FP
SO16
6 (8)
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
Preliminary Information
U4087B
Dimensions in mm
Package: SO16
94 8875
TELEFUNKEN Semiconductors
7 (8)
Rev. A1, 09-Sep-96
Preliminary Information
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.
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
Rev. A1, 09-Sep-96
Preliminary Information
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