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