STA323W ST Microelectronics, STA323W Datasheet - Page 2

• Manufacturer Part Number: STA323W
• Description: 2.1 High Efficiency Digital Audio System
• Manufacturer: ST Microelectronics

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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 I
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
Figure 2. Block Diagram
Figure 3. Channel Signal Flow Diagram through the Digital Core
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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Inp ut
2
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ORDERING INFORMATION
LRCKI
LRCKI
SDI_12
SDI_12
BICKI
BICKI
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Mapping
Channel
SDA
SDA
I
I
2
2
C
C
Re-sampling
SCL
SCL
Mapping &
Mapping &
Resampling
Resampling
Serial Data
Serial Data
Channel
Channel
CLK
CLK
Input,
Input,
PLL
PLL
System Contro
System Contro
System Timing
System Timing
Processing
l
l
EQ
Audio EQ, Mix,
Audio EQ, Mix,
Volume, Limiter
Volume, Limiter
Processing
Processing
Crossver,
Crossver,
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TWARN
TWARN
M ix
Power-Down
Power-Down
Crossover
Filter
DDX-SPIRIT
DDX-SPIRIT
Processing
Processing
FAULT
FAULT
DDX
DDX
®
®
Volume
Limiter
Interp
4X
Power Stage
Power Stage
Half-Bridge
Half-Bridge
Quad
Quad
EAPD
EAPD
2
DDX
S format.
®
OUT1A
OUT1A
OUT2A
OUT2A
OUT1B
OUT1B
OUT2B
OUT2B
DDX
Outp ut
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