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STMicroelectronics FDA903S Class-D Automotive Audio Amplifier

STMicroelectronics FDA903S Class-D Automotive Audio Amplifier is specifically designed for automotive applications, especially e-Call and telematics. The FDA903S incorporates a 24-bit, 100dB DAC conversion and PWM class-D output stage with feedback before the LC filter. This configuration can create the design of a compact and inexpensive application.

The STM FDA903S Class-D Automotive Audio Amplifier supports I2S and TDM digital bit stream up to 16CH with several sampling frequencies from 8kHz to 96kHz. FDA903S embeds a complete diagnostic in play, including real-time load-current monitoring and a digital admittance meter, to deliver the most demanding OEM requirements regarding speaker control and system robustness/ reliability. The FDA903S supports start stop cranking down to 3.3V.

The FDA903S is housed in a very compact and thin QFN 5×5 package.

Features

  • AEC-Q100 qualified
  • Integrated 100 dB D/A conversion
  • I2S and TDM digital input (up to 16CH TDM)
  • Selectable input sample rate frequency (8/16/32/44.1/48/96)
  • 3.3V to 18V Wide supply operating range
  • PWM frequency switching selectable by I2C
    • 352.8kHz, 384kHz, 411.6kHz, 448kHz
  • 2x I2C addresses
  • MOSFET power outputs
    • Typ 10W 4Ω @ 14.4V, 1kHz THD = 1%
    • Typ 5W 8Ω @ 14.4V, 1kHz THD = 1%
  • Noise: 80μV A-weighted: 20kHz
  • 8Ω, 4Ω driving capability
  • Input amplitude limiter (configurable through I2C)
  • Load current monitor
  • 2 CD/Diag pin
  • Integrated ESD and short circuit protection
  • I2C full configurability and diagnostic
    • Startup diagnostic
    • Input voltage amplitude limiter function (configurable through I2C)
    • 4x Thermal warning
    • DC diagnostic
    • OCP protection scheme configurable
    • Mute time configuration
    • DAM (Digital-Admittance-Meter)
  • Capability to run a complete diagnostic in play
    • Configurable clipping detector
    • One of the thermal warnings
    • Over current protection
    • Open load detection
    • High voltage mute
  • QFN32 with wettable flanks
  • Tested according to CISPR 25 – Class V (Fourth edition)

Applications

  • Telematics
  • e-Call

Block Diagram

Block Diagram - STMicroelectronics FDA903S Class-D Automotive Audio Amplifier

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STMicroelectronics FDA903S Class-D Automotive Audio Amplifier