FM Transmitter (Wireless Audio Link ICs)

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Audio ICsROHM's breakthrough wireless IC series incorporates a stereo modulator, frequency synthesizer and high frequency FM transmitter in one IC. Five configurations are offered: the BH1414K, BH1415F, BH1416F, BH1417F/FV and BH1418FV/KN.

ROHM's industry-first wireless IC series not only cuts board space by more than half, it opens up opportunities as unlimited as the designer's imagination. ROHM's innovative chip series enables portable electronic audio sources such as MP3 players, portable CD players, PDAs, video game players, cell phones, and laptop PCs to be connected to a more powerful audio system without cables or even line of sight technology. The features of numerous integrated functional blocks such as a stereo modulator, phase lock loop frequency synthesizer IC, RF oscillator circuitry and various HF circuits are all incorporated on a single BiCMOS IC. External parts count as well as board real estate is slashed. Performance is also increased with a signal-to-noise ratio of better than 70dB.

Applications

  • Wireless speakers
  • Car entertainment systems
  • Computer (sound board)
  • MP3 players
  • Video game players
  • CD changers
  • GPS Systems
  • Fax machines
  • Cell phones

BH1418FV/KN Features
transmission frequency - 321 stations
- The built-in pre-emphasis circuit, audio limiter circuit and audio filter improves sound quality.
-Built-in GE-Zenith system stereo modulation circuit.
-Monaural operation via BUS.
-Built-in audio-mute circuit.
-PLL frequency synthesizer integrated for a stable transmission frequency.
-Supports 3-wire serial BUS I/F.
-Low-voltage operation.

BH1417F/FV and BH1416F Features
transmission frequency - 14 stations
-The built-in pre-emphasis circuit, audio limiter circuit and audio filter improves sound quality.
-Built-in GE-Zenith system stereo modulation circuit.
-PLL frequency synthesizer integrated for stable transmission frequency.
-No microcontroller is required because the transmission frequency is set by hardware control.

BH1415F/FV Features
transmission frequency - 321 stations
-The built-in pre-emphasis circuit, audio limiter circuit and audio filter improves sound quality.
-Built-in GE-Zenith system stereo modulation circuit.
-Monaural operation via BUS is possible.
-Built-in audio-mute circuit.
-PLL frequency synthesizer integrated for stable transmission frequency.
-Supports 3-wire serial BUS I/F.

BH1414K Features
transmission frequency - 321 stations
-The built-in electronic volume via BUS enables level settings with different input sources.
-The built-in level variable type audio-limiter circuit enables free settings of limiter level.
-The built-in 19-kHz/38-kHz low pass trap filter improves sound quality.
-Built-in GE-Zenith system stereo modulation circuit.
-Monaural operation via BUS.
-Built-in audio-mute circuit.
-PLL frequency synthesizer integrated for stable transmission frequency.
-The OP-AMP is incorporated to form a PLL loop filter.
-Supports 3-wire serial BUS I/F.
-Software programmable port (open collector).