sta339bw STMicroelectronics, sta339bw Datasheet - Page 10

• Manufacturer Part Number: sta339bw
• Description: 2.1-channel High-efficiency Digital Audio System
• Manufacturer: STMicroelectronics

Description
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Description
The STA339BW is an integrated solution of digital audio processing, digital amplifier control,
and FFX-power output stage, thereby creating a high-power single-chip FFX
comprising high-quality, high-efficiency, all digital amplification.
STA339BW is based on FFX (fully flexible amplification) processor, a STMicroelectronics
proprietary technology. FFX is the evolution and the enlargement of the ST ternary
technology: the new processor can be configured to work in ternary, binary, binary
differential and phase shift PWM modulation schemes.
STA339BW contains the ternary, binary and binary differential implementations, a subset of
the full capability of the FFX processor.
The STA339BW is part of the Sound Terminal™ family that provides full digital audio
streaming to the speaker, offering cost effectiveness, low power dissipation and sound
enrichment.
The STA339BW power section consists of four independent half-bridges. These can be
configured via digital control to operate in different modes. 2.1 channels can be provided by
two half-bridges and a single full-bridge, providing up to 2 x 9 W + 1 x 20 W of power output.
Two channels can be provided by two full-bridges, providing up to 2 x 20 W of power. The IC
can also be configured as 2.1 channels with 2 x 20 W provided by the device and external
power for FFX power drive.
Also provided in the STA339BW are a full assortment of digital processing features. This
includes up to 8 programmable 28-bit biquads (EQ) per channel and bass/treble tone
control. Available presets enable a time-to-market advantage by substantially reducing the
amount of software development needed for certain functions. This includes audio preset
volume loudness, preset volume curves and preset EQ settings. There are also new
advanced AM radio interference reduction modes. Dual band DRC dynamically equalizes
the system to provide speaker linear frequency response regardless output power level.
This feature independently processes the two bands, controlling, dynamically, the output
power level in each band and so providing a better sound quality.
The serial audio data input interface accepts all possible formats, including the popular I
format. Three channels of FFX processing are provided. This high-quality conversion from
PCM audio to FFX PWM switching waveform provides over 100 dB SNR and dynamic
range.
Doc ID 15251 Rev 4
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