STA369BWS datasheet(9/89 Pages) STMICROELECTRONICS

9 / 89 page

STA369BWS

Description

Doc ID 16861 Rev 4

9/89

Description

The STA369BWS is an integrated solution of digital audio processing, digital amplifier

controls and power output stage to create a high-power single-chip FFX digital amplifier with

high-quality and high-efficiency. Three channels of FFX processing are provided. The FFX

processor implements the ternary, binary and binary differential processing capabilities of

the full FFX processor.

The STA369BWS is part of the Sound Terminal™ family that provides full digital audio

streaming to the speakers and offers cost effectiveness, low power dissipation and sound

enrichment.

The power section consists of four independent half-bridges. These can be configured via

digital control to operate in different modes.

For example, 2.1 channels can be provided by two half-bridges and a single full-bridge,

supplying up to 2 x 9 W + 1 x 20 W of output power or two channels can be provided by two

full-bridges, supplying up to 2 x 20 W of output power.

The IC can also be configured as 2.1 channels with 2 x 20 W supplied by the device plus a

drive for an external FFX power amplifier, such as STA533WF or STA515W.

Also provided in the STA369BWS 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 to manage low-frequency quantization noise in filters with very low

cut-off frequencies. The coefficient range -4 to +4 allows easy high-shelf filter usage and

better sound shaping. Available presets enable a time-to-market advantage by substantially

reducing the amount of software development needed for functions such as 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 linear frequency speaker response regardless of output power level.

This feature separates the audio frequency band into two sub-bands independently

processed to provide better sound clarity and to avoid speaker saturation.

The serial audio data input interface accepts all possible formats, including the popular I2S

format. The high-quality conversion from PCM audio to FFX PWM switching provides over

100 dB of SNR and of dynamic range.

The new F3X™ modulation is capable of digitally filtering the PWM carrier to simplify

external filtering requirements, AM interference and EMI. F3X™ is implemented in the

auxiliary output of STA369BWS and it is specifically designed for application where a simple

op-amp can be used to drive an auxiliary headphone line.

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