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U4087B - Low Voltage Voice Switch Interface Circuit

General 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.

Key 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 TLI2 15 Logic Noise detector CPT 14 VB 7 VM 13 CD GND 6 5 TLO1 2 Logic 1 TLI1 Bias = +.
  • + TS DIRE Logic DIRA Charge RLI2 9 Logic 8 RLO2 12 CT C. T. Generator 10 TLDR 11 TLDT Discharge.

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Full PDF Text Transcription for U4087B (Reference)

Note: Below is a high-fidelity text extraction (approx. 800 characters) for U4087B. For precise diagrams, tables, and layout, please refer to the original PDF.

www.DataSheet4U.com U4087B Low Voltage Voice Switch Interface Circuit for Hands-free Operation in Telephone Description The voice switch interface circuit U4087B is a lin...

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lephone 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