Features
 Wide-range supply voltage
– 4.5 V to 26 V (operating range)
– 30 V (absolute maximum rating)
 I2C control with selectable device address
 Embedded full IC protection
– Manufacturing short-circuit protection (out
vs. gnd, out vs. vcc, out vs. out)
– Thermal protection
– Overcurrent protection
– Undervoltage protection
 I2S interface, sampling rate 32 kHz ~ 192 kHz,
with internal sampling frequency converter for
fixed processing frequency
 Three output power stage configurations
– 2.0 mode, L/R full bridges
– 2.1 mode, L/R two half-bridges, subwoofer
full bridge
– 2.1 mode, L/R full bridges, PWM output for
external subwoofer amplifier
 Driving load capabilities
– 2 x 20 W into 8  ternary modulation
– 2 x 9 W into 4 + 1 x 20 W into 8 
 FFXTM 100 dB dynamic range
 Fixed output PWM frequency at any input
sampling frequency
 Embedded RMS meter for measuring real-time
loudness
 New fully programmable noise-gating function
 Up to 12 user-programmable biquads with
noise-shaping technology
 Direct access to coefficients through I2C
shadowing mechanism
 Fixed (88.2 kHz / 96 kHz) internal processing
sampling rate
 Two independent DRCs configurable as a
dual-band anticlipper or independent
limiters/compressors (B2DRC)
 Digital gain/att +48 dB to -80 dB with
0.125 dB/step resolution
 Independent (fade-in, fade-out) soft volume
update with programmable rate 48 ~ 1.5 dB/ms
 Bass/treble tones control
 Audio presets: 15 crossover filters,
5 anticlipping modes, nighttime listening mode
 STSpeakerSafeTM protection circuitry
– Pre- and post-processing DC blocking
filters
– Checksum engine for filter coefficients
– PWM fault self-diagnosis
 STCompressorTM dual-band DRC

Description
The STA380BW is an integrated solution embedding digital audio processing, digital
amplification and FFXTM power output stage. It is part of the Sound Terminal® family and
provides full digital audio streaming from the source to the speaker, offering cost
effectiveness, low power dissipation and sound enrichment.
The STA380BW input section consists of a flexible digital input serial audio interface feeding
the digital processing unit. The serial audio data input interface supports many formats,
including the popular IIS format.
The STA380BW is based on an FFXTM (Fully Flexible Amplification) processor, proprietary
technology from STMicroelectronics. FFXTM is the evolution of the ST ternary technology:
the advanced processor is available for ternary, binary, binary differential and phase shift
PWM modulation. The STA380BW embeds the ternary, binary and binary differential
implementations, a subset of the full capability of the FFXTM processor.
The STA380BW power section consists of four independent half-bridges. These can be
configured via digital control to operate in different modes. A 2.1-channel setup can be
implemented with two half-bridges (L/R) together with a single full-bridge (subwoofer).
Alternatively, the 2.0-channel setup can be done with two full-bridges. When using this
configuration, an external amplifier for the SW channel can also be driven through the PWM
output. The STA380BW is able to deliver 2 x 20 W (ternary) into an 8  load at 18 V or
2 x 9 W (binary) into a 4  load, plus 1 x 20 W (ternary) into an 8  load at 18 V.
The STA380BW digital processing unit includes up to 12 programmable biquads (EQs),
allowing perfect sound equalization and offering advanced noise-shaping techniques.
Moreover, the coefficient range ensures a great variety of filter shapes (low/high-pass,
low/high shelf, peak, notch, band-pass). The equalization engine is fully compatible with the
ST speaker compensation technology embedded into the APWorkbench suite. A state-ofthe-
art multi-band DRC, STCompressorTM equalizes the system to provide active speaker
protection with full audio quality preservation against sudden sound peaks. Moreover,
STSpeakerSafeTM technology offers reliable speaker protection under any condition. The
master clock can be from stable BICKI (64xfs, 50% duty cycle) or external XTI. Obsolete