STA381BW datasheet(16/171 Pages) STMICROELECTRONICS

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Description

STA381BW

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Doc ID 018835 Rev 7

Description

The STA381BW is an integrated solution embedding digital audio processing, digital

amplification, FFXTM 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 STA381BW 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 STA381BW 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 STA381BW embeds the ternary, binary and binary differential

implementations, a subset of the full capability of the FFXTM processor.

The STA381BW 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 STA381BW 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 STA381BW 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 STA381BW 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, 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.

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