STA328 datasheet(5/57 Pages) STMICROELECTRONICS

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STA328

Description

5/57

Description

1.1

Overview

The STA328 comprises digital audio processing, digital amplifier control and DDX® power

output stage to create a high-power single-chip DDX® solution for high-quality,

high-efficiency, all digital amplification.

The STA328 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 to give up to 2 x 40 W plus 1 x 80 W of power

output. Two channels can be provided by two full-bridges to give up to 2 x 80 W of power.

The IC can also be configured as a single parallel full-bridge capable of high-current

operation and 1 x 160 W output.

Also provided in the STA328 is a full assortment of digital processing features. This includes

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

AutoModes enable 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, preset EQ settings. 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 patented DDX® 3-state PWM switching provides over 100 dB of SNR and dynamic

range.

Figure 1.

Block diagram

Figure 2.

Channel signal flow diagram through the digital core

Serial Data

Input,

Channel

Mapping &

Resampling

DDX

Processing

Quad

Half-Bridge

Power Stage

OUT1A

OUT1B

OUT2A

OUT2B

LRCKI

SDI_12

SDA

SCL

PLL

CLK

EAPD

BICKI

FAULT

TWARN

Power-Down

System Contro

Audio EQ, Mix,

Crossver,

Volume, Limiter

Processing

System Timing

DDX-SPIRIT

Serial Data

Input,

Channel

Mapping &

Resampling

DDX

Processing

Quad

Half-Bridge

Power Stage

OUT1A

OUT1B

OUT2A

OUT2B

LRCKI

SDI_12

SDA

SCL

PLL

CLK

EAPD

BICKI

FAULT

TWARN

Power-Down

System Contro

Audio EQ, Mix,

Crossver,

Volume, Limiter

Processing

System Timing

DDX-SPIRIT

Channel

Mapping

Re-sampling

Processing

Mix

Volume

Limiter

Interp

DDX®

I2S

Input

DDX

Output

Crossover

Filter

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