The FDA903S is the new ST single channel class-D audio amplifier, specifically designed for automotive applications. The FDA903S integrates a 24-bit, 100 dB DAC conversion and PWM class-D output stage with feedback before LC filter. This configuration enables the design of a compact and inexpensive application.

The FDA903S supports I²S and TDM digital bit stream up to 16CH with several sampling frequencies from 8 kHz up to 96 kHz. FDA903S embeds a complete diagnostic in play, including real-time load-current monitoring and digital admittance meter, to support the most demanding OEM requirements in terms of speaker control and system robustness/ reliability.

The FDA903S supports start stop cranking down to 3.3 V and it is available in a very compact and thin QFN 5x5 package. Thus the FDA903S is suitable for any level of automotive application especially e-Call and Telematics.

• 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 kHz)
• Wide supply operating range: 3.3 V - 18 V
• PWM frequency switching selectable by I²C
  • 352.8 kHz, 384kHz, 411.6 kHz, 448 kHz
• 2 I²C addresses
• MOSFET power outputs
  • Typ 10 W 4 Ω at 14.4 V, 1 kHz THD = 1%
  • Typ 5 W 8 Ω at 14.4 V, 1 kHz THD = 1%
• Noise: 38 μV A-weighted: 20 kHz
• 8 Ω, 4 Ω driving capability
• Input amplitude limiter (configurable through I²C)
• I²C full configurability and diagnostic
  • Startup diagnostic
  • Input voltage amplitude limiter function (configurable through I²C)
  • 4 x Thermal warning
  • DC diagnostic
  • OCP protection scheme configurable
  • Mute time configuration
  • DAM (Digital-Admittance-Meter)
• Capability to run complete diagnostic in play
  • Configurable Clipping Detector
  • One of the Thermal Warnings
  • Over Current Protection
  • Open Load detection
  • High voltage mute
• Load current monitor
• 2 CD/Diag pin
• Integrated ESD and short circuit protection
• QFN32 wettable flanks
• Tested according to CISPR 25 - Class V (Fourth edition)