STMicroelectronics HFDA801A Class-D Audio Amplifiers
STMicroelectronics HFDA801A Class-D Audio Amplifiers, based on BCD (Bipolar CMOS DMOS) technology, are optimized for compact, cost-effective automotive applications. The HFDA801A components integrate a 24-bit, 120dB DAC (Digital-to-Analog Converter), and feature a 2MHz switching PWM (Pulse-Width Modulation) output stage. This configuration enables the design of a compact and inexpensive application, reaching at the same time an outstanding level of audio performance. The HFDA801A amplifiers support wide-band applications (80kHz), with an extremely low level of noise and low THD (Total Harmonic Distortion). With a signal-to-noise ratio of 121dB, 120dB dynamic range, and only 10μV output noise, the HFDA801A components deliver a high level of audio performance from an inexpensive small form-factor component.
The feedback configuration with an integrated L-C low-pass filter provides an ultra-wide flat frequency response up to 80kHz and minimizes dependence on external components. The wide bandwidth allows use in high-definition (HD) audio applications, letting designers rely on excellent linearity and low distortion that are independent of the inductor and capacitor quality.
The specific architecture implemented derives all required voltages internally, enabling the HFDA801A amplifiers to draw supply from the vehicle battery without the need for additional power converters. The amplifiers benefit from a wide range of load capabilities, ensuring stable performance even while driving at high power on low-impedance loads of 2Ω on all four channels.
In addition, by integrating in-play diagnostics as well as a digital impedance meter and real-time load-current monitor, the HFDA801A Audio Amplifiers can be used in safety-related audio applications that must demonstrate ASIL compliance, such as Acoustic Vehicle Alerting Systems (AVAS).
Features
- AEC-Q100 qualification pending
- Integrated 120dB D/A conversion
- I2S and TDM digital input (up to 16-CH TDM)
- Selectable input sample rate frequency (44.1kHz/48kHz/96kHz/192kHz)
- Wide supply operating range of 4.5V to 2518V (5V min. at turn-on transition)
- PWM 2MHz switching PWM
- Reduced size and cost of output LC
- High-Resolution Bandwidth support
- Up to 40kHz (I2S 96kHz) with attenuation [0dB, -2dB]
- Up to 80kHz (I2S 192kHz) with attenuation [0dB, -2dB]
- 4 I2C addresses
- 4Ω, 2Ω, 1Ω driving with output channels parallelization
- MOSFET power outputs allowing high output power capability
- Typical 4x 30W/4Ω @ 14.4V, 1kHz THD = 10%
- Typical 4x 25W/4Ω @ 14.4V, 1kHz THD = 1%
- Typical 4x 50W/2Ω @ 14.4V 1kHz THD = 10%
- Typical 4x 80W/4Ω @ 25V, 1kHz THD = 10%
- I2C full configurability and diagnostic
- 4x Thermal warning and average junction temperature measurement on I2C (8 bits)
- AC and DC diagnostic (independent of channel)
- OCP protection scheme configurable (4x OCP limit selectable)
- Mute time configuration
- DIM (digital impedance meter)
- Feedback after filter configuration
- Capability to run a complete diagnostic in play
- Short to GND/VCC
- DC offset detector
- Extremely Low noise of 13µV A-weighted; 20kHz (high gain) typical
- Very low THD
- 0.02% at 1W 1kHz on 4Ω and 2Ω loads typical
- 0.08% 20Hz to 20kHz (full audio band) on 4Ω and 2Ω loads (1W)
- 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 (40V)
- 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 (2kV HBM, 500V/750V corner CDM)
- LQFP64 exposed pad up package
Block Diagram
