STA350B datasheet(12/94 Pages) STMICROELECTRONICS

12 / 94 page

Description

STA350B, STA350BW

12/94

DocID018572 Rev 7

Description

The STA350Bx 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, and all-digital amplification.

The STA350Bx is based on an FFX (fully flexible amplification) processor, a proprietary

technology from STMicroelectronics. FFX is the evolution and the enlargement of ST’s

ternary technology: the new processor can be configured to work in ternary, binary, binary

differential and phase-shift PWM modulation schemes.

The STA350Bx contains the ternary, binary and binary differential implementations, a subset

of the full capability of the FFX processor.

The STA350Bx 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 STA350Bx 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 18 W + 1 x 40 W of music output

power, by using standard 4 and 8

Ω speakers. Two channels can be provided by two full-

bridges, providing up to 2 x 50 W of music power, by using standard 6

Ω speaker or

2 x 40 W by using 8

Ω speakers at 25 V. The IC can also be configured as 2.1 channels with

2 x 40 W provided by the device and external power for FFX power drive. If configured as

mono-BTL, the latter is capable of providing up to 1 x 90 W on a standard 3

Ω load or

1 x 75 W by using a 4

Ω

, setting the supply voltage at 25 V. Please refer to the package

thermal characteristics and application suggestions for more details.

Also provided in the STA350Bx are a full assortment of digital processing features. This

includes up to 8 programmable biquads (EQ) per channel. Special digital signal processing

techniques are available in order to manage low-frequency quantization noise in case of

very low frequency cutoff filter thresholds. The coefficient range -4..4 allows the easy

implementation of high shelf filters. Available presets allow the advantage of earlier time-to-

market 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 output power level. This feature independently processes the two bands,

controlling dynamically the output power level in each band and so providing better sound

clarity.

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.

STA350B Datasheet(PDF) 12 Page - STMicroelectronics

STA350B Datasheet(HTML) 12 Page - STMicroelectronics

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