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What is U4087B?

This electronic component, produced by the manufacturer "TEMIC Semiconductors", performs the same function as "Low Voltage Voice Switch Interface Circuit".


U4087B Datasheet PDF - TEMIC Semiconductors

Part Number U4087B
Description Low Voltage Voice Switch Interface Circuit
Manufacturers TEMIC Semiconductors 
Logo TEMIC Semiconductors Logo 


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U4087Bwww.DataSheet4U.com
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)

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U4087B equivalent
U4087Bwww.DataSheet4U.com
Pin Description
Pin Symbol
Function
1 TLI1 Transmit level detector input on the line side
2 TLO1 Transmit level detector output on the line side
3 RLO1 Receive level detector output on the line side
4 RLI1 Receive level detector input on the line side
5 GND Ground
6 CD
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 kW.
7 VB
Supply voltage 2.8 to 7.0 V, approx. @ 1 mA
8 RLO2 Receive level detector output on the microphone/speaker side
9 RLI2 Receive level detector input on the microphone/speaker side
10 TLDR Positive control output for U4090B
11 TLDT Negative control output for U4090B
12 CT
13 VM
Response time
An RC at this pin sets the response time for the circuit to switch modes
XIt is a system ac ground, supplied by U4090B, VM VB/2
14 CPT
An RC at this pin sets the time constant for the transmit background monitor
15 TLI2 Transmit level detector input on the microphone/speaker side
16 TLO2 Transmit level detector output on the microphone/speaker side, and input to the transmit
background monitor
Absolute Maximum Ratings
Reference point Pin 1, Tamb = 25°C, unless otherwise specified
Supply voltage
Voltages:
Parameters
Storage temperature range
Junction temperature
Ambient temperature range
Power dissipation
Tamb = 60 °C
Maximum thermal resistance
Junction ambient
Pin 7
Pin 6
Pin 13
SO 16
SO 16
Symbol
VB
Tstg
Tj
Tamb
Ptot
RthJA
Value
– 0.3 to + 12
– 0.3 to 6
– 0.3 to (VB + 0.3)
– 55 to + 150
125
– 20 to + 60
750
110
Unit
V
V
°C
°C
°C
mW
K/W
Operation Recommendation
Parameters
Test conditions / Pin
Symbol Min.
Typ.
Max.
Unit
Supply voltage
CD input Pin 6
Ambient temperature range
Pin 7 VB 3.0 – 7.0 V
0 – VB V
Tamb
– 20
+ 60 °C
TELEFUNKEN Semiconductors
Rev. A1, 09-Sep-96
Preliminary Information
5 (8)


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U4087BThe function is Low Voltage Voice Switch Interface Circuit. TEMIC SemiconductorsTEMIC Semiconductors

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