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®solution comprising high-quality, high-efficiency, all digital amplification.
STA339BW is based on FFX (fully flexible amplification) processor, an 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 of the output power level. This feature independently processes the two bands, controlling dynamically the output power level in each band and so providing better sound quality.
The serial audio data input interface accepts all possible formats, including the popular I2S 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.
**Key Features**
Wide voltage supply range
5 V to 26 V (operating range)
30 V (absolute maximum rating)
3 power output configurations
2 channels of ternary PWM (stereo mode) (2 x 20 W into 8 Ω at 18 V)
3 channels - left, right using binary and LFE using ternary PWM (2.1 mode) (2 x 9 W + 1 x 20 W into 2 x 4 Ω, 1 x 8 Ω at 18 V)
2 channels of ternary PWM (2 x 20 W) + stereo lineout ternary
2.1 channels of 24-bit FFX® 100 dB SNR and dynamic range
Selectable 32 to 192 kHz input sample rates
I2 C control with selectable device address
Digital gain/attenuation +48 dB to -80 dB with 0.5 dB/step resolution
Soft volume update with programmable ratio
Individual channel and master gain/attenuation
Two independent DRC configurable as a dual-band anti-clipper (B2 DRC) or as independent limiters/compressors
EQ-DRC for DRC based on filtered signals
Dedicated LFE processing for bass boosting with 0.5 dB/step resolution
Audio presets:
15 preset crossover filters
5 preset anti-clipping modes
Preset night-time listening mode
Individual channel and master soft/hard mute
Independent channel volume and DSP bypass
Automatic zero-detect mute
Automatic invalid input-detect mute
2-channel I2 S input data interface
Input and output channel mapping
Up to 8 user-programmable biquads per channel with 28-bit resolution
3 coefficient banks for EQ presets storing with fast recall via I2 C interface
Bass/treble tones and de-emphasis control
Selectable high-pass filter for DC blocking
Advanced AM interference frequency switching and noise suppression modes
Selectable high- or low-bandwidth noise-shaping topologies
Variable max power correction for lower full-power THD
Selectable clock input ratio
96 kHz internal processing sample rate, 24 to 28-bit precision
Thermal overload and short-circuit protection embedded
