Voice Switched Speakerphone Circuit with Speaker Amplifier

Manufacturer's part number :


Manufacturer New Japan Radio

New Japan Radio

Description :

The NJW1128 is a Voice Switched Speakerphone Circuit. It includes all of functions processing a high quality hands free speakerphone system, such as the necessary amplifiers ( Mic , Receive ,Line, Speaker ), attenuators, level detectors functions.

The NJW1128 is controllable independently power-down of the speaker amplifier and the entire IC excluding the speaker amplifier.

All external capacitors are sufficient small so that ceramic capacitors are applied.

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  • Operating voltage range (3.9 to 5.5V)
  • Attenuator gain range between Transmit and Receive (52dB)
  • Speaker amplifier
  • Microphone amplifier with mute function
  • Force to Receive, Transmit, or Idle modes
  • Mode-watching monitor
  • Background noise monitor for each path
  • 4-point signal sensing
  • Chip disable Pin powers down the entire IC excluding
  • Speaker switch Pin power down the speaker amplifier
  • Microphone and Receive Amplifiers pinned out for flexibility
  • Package Outline (LQFP48-R3)
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Type/ Function Voice Switched Speakerphone circuit  

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Package Outline LQFP-48-R3