sta381bws STMicroelectronics, sta381bws Datasheet - Page 16

• Manufacturer Part Number: sta381bws
• Description: Sound Terminal 2.1-channel High-efficiency Digital Audio System Sound Terminal 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

Description
1
16/168
Description
The STA381BWS is an integrated solution embedding digital audio processing, digital
amplification, FFX
the Sound Terminal
speaker, offering cost effectiveness, low power dissipation and sound enrichment.
The STA381BWS 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 STA381BWS is based on an FFX
STMicroelectronics proprietary technology. FFX
technology: the advanced processor is available for ternary, binary, binary differential and
phase shift PWM modulation. STA381BWS embeds the ternary, binary and binary
differential implementations, a subset of the full capability of the FFX
The STA381BWS 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 be also driven through the PWM
output. The STA381BWS 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 STA381BWS 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 STA381BWS 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
protection with full audio quality preservation against sudden sound peaks. Moreover,
STSpeakerSafe
master clock can be from stable BICKI (64xfs, 50% duty cycle) or external XTI.
TM
TM
technology offers reliable speaker protection under any condition. The
®
power output stage, headphone and 2 Vrms line outputs. It is part of
family and provides full digital audio streaming from the source to the
Doc ID 018937 Rev 2
TM
TM
(Fully Flexible Amplification) processor, an
, equalizes the system to provide active speaker
TM
is the evolution of the ST ternary
TM
processor.
STA381BWS