Features
• AEC-Q100 qualification on going
• 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 - 2518 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 4 x 30 W /4 Ω @ 14.4 V, 1 kHz THD = 10%
– Typ 4 x 25 W /4 Ω @ 14.4 V, 1 kHz THD = 1%
– Typ 4 x 50 W/2 Ω @ 14.4 V 1 kHz THD =10 %
– Typ 4 x 80 W/4 Ω @ 25V 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

Description
HFDA801A is the new ST class-D audio amplifier, specifically designed for
automotive applications in the latest BCD technology. The HFDA801A integrates
a 24-bits 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.
HFDA801A 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. HFDA801A 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 HFDA801A is suitable for any level of
automotive application.