TFA9879HN, Mono BTL Class D Audio Amplifier for Portable Applications with Digital Input

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Product Details

Block Diagram

TFA9879 Block Diagram

TFA9879 Block Diagram


General Features

  • Closed loop amplifier for:
    • High power supply rejection ratio
    • Excellent audio performance
  • Digital input for high RF immunity
  • High efficiency for maximizing battery life
  • Wide supply voltage range (fully operational from 2.5 V to 5.5 V)
  • Delivers high output power into 4 Ω and 8 Ω load impedances
  • Phase-Locked Loop (PLL); no system clock required
  • Protection including diagnostics via I²C-bus:
    • OverCurrent Protection (OCP) to protect against short circuits across the speaker, to the supply line or to ground
    • OverTemperature Protection (OTP)
    • Digital inputs protected with UnderFrequency Protection (UFP), OverFrequency Protection (OFP) and Invalid Bit-clock Protection (IBP)
  • ‘Pop noise’ free at power-up/power down, during sample rate switching and when switching between digital inputs
  • Four separate I²C addresses for multi-channel applications
  • 1.8 V / 3.3 V tolerant digital inputs
  • Only three external components required

Programmable Digital Sound Processor (DSP)

  • Digital volume control (-70 dB to +24 dB)
  • Digital parametric 5-band equalizer
  • Bass and treble control (-18 dB to +18 dB)
  • Dynamic range compressor:
    • Programmable attack and release levels
    • Programmable attack and release rates
  • Soft and hard mute control
  • Programmable DC blocking via high-pass filter
  • Power limiter (0 dB to -124 dB in 0.5 dB steps)
  • Zero crossing volume control
  • Stereo-to-mono down-mix function

Interface Format Support for Digital Audio Inputs

  • I²S formats (fs = 8 kHz to 96 kHz):
    • Philips standard I2S
    • Japanese I2S MSB-justified
    • Sony I2S LSB-justified
  • PCM / IOM2 formats (fs = 8 kHz or fs = 16 kHz):
    • Long frame sync
    • Short frame sync

Target Applications

  • Mobile phones
  • Portable Navigation Devices (PND)
  • PDAs
  • Notebooks
  • Portable gaming devices
  • MP3 and MP4 players

Part numbers include: TFA9879HN.


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