STA382BW
Description
Doc ID 022783 Rev 1
1 Description
The STA382BW is an integrated solution embedding digital audio processing, digital
amplification, FFX
TM
power output stage, headphone and 2 Vrms line outputs. 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 STA382BW input section consists of a flexible digital input serial audio interface,
feeding the digital processing unit, and an analog 1 Vrms input for a seamless connection
with pure analog sources. The serial audio data input interface supports many formats,
including the popular IIS format.
The STA382BW is based on an FFX
TM
(Fully Flexible Amplification) processor, proprietary
technology from STMicroelectronics. FFX
TM
is the evolution of the ST ternary technology:
the advanced processor is available for ternary, binary, binary differential and phase shift
PWM modulation. The STA382BW embeds the ternary, binary and binary differential
implementations, a subset of the full capability of the FFX
TM
processor.
The STA382BW 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 STA382BW is able to deliver 2 x 20 W (ternary) into an 8
Ω
load at 18 V or
2 x 9 W (binary) into a 4
Ω
load, plus 1 x 20 W (ternary) into an 8
Ω
load at 18 V.
The STA382BW also provides a capless headphone out (with embedded negative charge
pump), able to deliver up to 40 mW into a 32
Ω
load or, alternatively, can be configured as a
2 Vrms line output.
The STA382BW 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-of-
the-art multi-band DRC, STCompressor
TM
, equalizes the system to provide active speaker
protection with full audio quality preservation against sudden sound peaks. Moreover,
STSpeakerSafe
TM
technology offers reliable speaker protection under any condition. The
master clock can be from stable BICKI (64xfs, 50% duty cycle) or external XTI.
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