STMicroelectronics HFDAx0D Class-D Automotive Audio Amplifiers
STMicroelectronics HFDAx0D Class-D Automotive Audio Amplifiers are designed for modern infotainment and cockpit systems. These high-performance 4-channel amplifiers are built using advanced BCD technology and operate at a high 2MHz switching frequency, enabling compact PCB designs and reduced output filter costs. The STMicroelectronics HFDAx0D supports wideband audio up to 40kHz with exceptionally low total harmonic distortion (THD) and noise, delivering premium sound quality suitable for OEM-grade applications.
These amplifiers feature robust diagnostic capabilities, including independent channel monitoring, load detection, and protection mechanisms, ensuring system reliability and speaker safety. With support for I2S and TDM digital inputs (up to 16 channels), fast turn-on, and low latency, the amplifiers are ideal for applications such as active noise cancellation and high-speed audio processing. Compatible with start/stop vehicle systems, the compact LQFP48L packaging makes them versatile solutions for space-constrained automotive environments.
Features
- AEC-Q100 qualified
- 4.5V to 18V supply operating range
- EMI compliance is evaluated according to CISPR25
- Class-D BTL outputs
- Integrated 112dB D/A conversion
- Battery load dump compatible (40V)
- Reduced size and cost of output LC thanks to 2MHz switching PWM
- I2S and TDM digital input (up to 16x channels TDM)
- Selectable input sample rate frequency (44.1kHz, 48kHz, 96kHz, or 192kHz)
- Multiple load configurations, able to drive 4Ω and 2Ω speaker loads
- MOSFET power outputs allow high output power capability
- Typical 4x29W on 4Ω at 14.4V, 1kHz, THD = 10%
- Typical 4x22.5W on 4Ω at 14.4V, 1kHz, THD = 1%
- Typical 4x47.5W on 2Ω at 14.4V, 1kHz, THD = 10%
- Typical 4x35.5W on 2Ω at 14.4V, 1kHz, THD = 1%
- Outstanding audio performances
- 0.015% typical THD at 1W, 1kHz on 4Ω loads
- 27μV typical output noise A-weighted
- 100dB typical crosstalk at 1W, 1kHz on 4Ω loads
- 80dB typical PSRR at 1W, 1kHz on 4Ω loads
- Fast turn-on and very low latency for high-speed audio processing applications
- Very low latency for noise-cancelling applications
- I2C full configurability with channel-independent mute/play/gain selection/diagnostic
- 4x I2C addresses
- Full diagnostic matrix with info available both on I2C and CD/DIAG pin
- 4x thermal warnings
- Independent by-channel DC and AC load detection diagnostic with selectable threshold
- Startup diagnostic for shorts to VCC/GND
- OCP protection with configurable OCP limit (2x selectable)
- Input offset detector
- Digital Admittance Meter (DAM)
- Free-running diagnostics
- Output current offset detector
- DC/AC diagnostics
- Including open-load in play detection
- DAM
- Load current monitor
- Synchronization output pin
- Immune to pop/tick noise at turn on/off, battery variations, during diagnostic
- Legacy (backup mode without I2C control)
- Integrated short circuit protections
- ESD integrated protections (2kV HBM, 500V/750V corner CDM)
- LQFP48L exposed pad up package, 7mm x 7mm x 1.4mm size
Applications
- Automotive infotainment systems
- Smart cockpit audio systems
- Multi-channel car audio amplification
- Noise-canceling audio systems
- OEM-grade audio systems
- Start/stop vehicle systems
- Digital audio architectures
- High-performance audio playback
- Speaker load monitoring and protection
- Compact and space-constrained designs
Datasheets
- HFDA80D 4-channel digital input Class-D automotive audio amplifier with Hi‑Fi audio quality, in-play diagnostics, 2MHz switching frequency
- HFDA90D 4-channel digital input Class-D automotive audio amplifier with Hi‑Fi audio quality, in-play diagnostics, 2MHz switching frequency with load current monitor
Block Diagram
Application Circuit
