STA335BW Просмотр технического описания (PDF) - STMicroelectronics

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STA335BW

2.1 channels high-efficiency digital audio system

STMicroelectronics 

Description

1

Description

STA335BW

The STA335BW is an integration of digital audio processing, digital amplifier control and

DDX® power-output stage to create a high-power single-chip DDX solution comprising

high-quality, high-efficiency and all digital amplification.

The STA335BW is part of the Sound Terminal™ family that provides full digital audio

streaming to the speaker offering cost effectiveness, low energy dissipation and sound

enrichment.

The STA335BW 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 37 W of power. The IC

can also be configured as 2.1 channels with 2 x 30 W provided by the device and external

power for DDX® power drive.

Also provided in the STA335BW are a full assortment of digital processing features. This

includes up to four programmable 28-bit biquads (EQ) per channel, and bass/treble tone

control. Automode™ enables a time-to-market advantage by substantially reducing the

amount of software development needed for certain functions. This includes auto volume

loudness, preset volume curves and preset EQ settings. There are also new advanced AM

radio-interference reduction modes. The serial audio data input interface accepts all

possible formats, including the popular I2S format. Three channels of DDX® processing are

provided. This high-quality conversion from PCM audio to the DDX-patented 3-state PWM

switching waveform provides over 100 dB SNR and dynamic range.

Figure 1. Block diagram

I2C

I2S

interface

Protection

current/thermal

Channel

1A

Volume

control

DDX

Power

control

PLL

Digital signal processing

Logic

Channel

1B

Regulators

Bias

Channel

2A

Channel

2B

Power

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