STA323WTR 데이터 시트보기 (PDF) - STMicroelectronics

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STA323WTR

2.1 HIGH EFFICIENCY DIGITAL AUDIO SYSTEM

STMicroelectronics 

STA323W

ment of digital processing features. This includes up to 4 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, etc. New advanced AM radio inerference 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 DDX's

patented tri-state PWM switching waveform provides over 100dB SNR and dynamic range.

3 ORDERING INFORMATION

Figure 2. Block Diagram

SDA SCL

I2C

System Contrlo

DDX-SPIRIT

LRCKI

BICKI

SDI_12

Serial Data

Input,

Channel

Mapping &

Resampling

Audio EQ, Mix,

Crossver,

Volume, Limiter

Processing

DDX ®

Processing

System Timing

PLL

CLK

TWARN

FAULT

Power-Down

Quad

Half-Bridge

Power Stage

EAPD

OUT1A

OUT1B

OUT2A

OUT2B

Figure 3. Channel Signal Flow Diagram through the Digital Core

I2S

Inp ut

Channel

M ap p ing

Re-samp ling

EQ

Processing

M ix

Crossover

Filter

Volume

Limiter

4X

Interp

DDX®

DDX

Out p ut

3.1 EQ Processing

Two channels of input data (re-sampled if necessary) at 96 kHz are provided to the EQ processing block.

In this block, upto 4 user-defined Biquads can be appplied to each of the two channels.

Pre-scaling, dc-blocking high-pass, de-emphasis, bass, and tone control filters can also be applied based

on various configuration parameter settings.

The entire EQ block can be bypassed for all channels simulatneously by setting the DSPB bit to '1'. And

the CxEQBP bits can be used to bypass the EQ functionality on a per channel basis. Figure below shows

the internal signal flow through the EQ block.

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