HFDA802 is the new ST class-D audio amplifier, specifically designed for automotive applications in the latest BCD technology. The HFDA802 integrates a 24-bit 120 dB DAC conversion, and features 2 MHz switching PWM class D output stage. This configuration enables the design of a compact and inexpensive application, reaching at the same time outstanding level of audio performances. HFDA802 supports wide band applications (80 kHz), with extremely low level of noise and low THD. Moreover it features the most complete diagnostic matrix, including full diagnostic in play to support the most demanding OEM requirements in terms of speaker control and system robustness/ reliability. HFDA802 supports start stop cranking down to 4.5 V (5 V at turn on) and it is housed in a very compact and thin LQFP 10x10 package. Thus the HFDA802 is suitable for any level of automotive application.

• AEC-Q100 qualified
• Integrated 120 dB D/A conversion
• I²S and TDM digital input (up to 16 CH TDM)
• Selectable input sample rate frequency (44.1/48/96/192 kHz)
• Wide supply operating range: 4.5 V - 25 V (5 V min at turn-on transition)
• PWM 2 MHz switching PWM:
  • Reduced size and cost of output LC
• High resolution bandwidth support:
  • Up to 40 kHz (I²S 96 kHz) with attenuation [0 dB, -2 dB]
  • Up to 80 kHz (I²S 192 kHz) with attenuation [0 dB, -2 dB]
• 4 I²C addresses
• 4 Ω, 2 Ω, 1 Ω driving with output channels parallelization
• MOSFET power outputs allowing high output power capability:
  • Typ 2 x 30 W/4 Ω @ 14.4 V, 1 kHz THD = 10%
  • Typ 2 x 25 W/4 Ω @ 14.4 V, 1 kHz THD = 1%
  • Typ 2 x 50 W/2 Ω @ 14.4 V 1 kHz THD = 10 %
  • Typ 2 x 80 W/4 Ω @ 25 V, 1 kHz THD = 10 %
• I²C full configurability and diagnostic:
  • 4 x Thermal warning and average junction temperature measurement on I²C (8 bits)
  • AC and DC diagnostic (independent of channel)
  • OCP protection scheme configurable (4 x OCP limit selectable)
  • Mute time configuration
  • DIM (digital impedance meter)
  • Feedback after filter configuration
• Capability to run complete diagnostic in play:
  • Short to GND/VCC
  • DC offset detector
• Extremely Low noise:
  • 13 µV A-weighted; 20 kHz (high gain) typ
• Very low THD:
  • 0.02% at 1 W 1 kHz on 4 and 2 Ω loads typ
  • 0.08% 20-20 kHz (full audio band) on 4 and 2 Ω loads (1 W)
• CD/Diag pin (3 selectable CD thresholds)
• Synchronization output pin (only with TDM input stream, on I²Sdata2)
• Channel independent Mute/Play/Gain selection/Diagnostic
• Real Time current monitor
• Open Load in play
• Battery load dump compatible (40 V)
• Immune to pop/tick noise at turn on/off, battery variations (inside the operative range), during diagnostic
• EMI compliance evaluated according to CISPR25
• Legacy (no I²C mode)
• Integrated short circuit protections
• ESD integrated protections (2 kV HBM, 500 V/750 V corner CDM)
• LQFP64 exposed pad up package