STA333BW datasheet(8/68 Pages) STMICROELECTRONICS

8 / 68 page

Description

STA333BW

8/68

DocID13773 Rev 5

Description

The STA333BW is an integrated solution of digital audio processing, digital amplifier

controls and power output stages 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 STA333BW 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.

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.

Also provided in the STA333BW are a full assortment of digital processing features. This

includes up to 5 programmable biquads (EQ) per channel. 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.

The DRC dynamically equalizes the system to provide a linear frequency speaker response

regardless of output power level.

Figure 1. Block diagram

Protection

current / thermal

Logic

Regulators

Bias

Power

control

FFX

PLL

Volume

control

Channel

I²S

interface

Power

Digital DSP

I²C

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