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STA328
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
ORDERING INFORMATION
Figure 2. Block Diagram
SDA
SDA
SCL
SCL
2
2
I
I
C
C
LRCKI
LRCKI
Serial Data
Serial Data
BICKI
BICKI
Mapping &
Mapping &
SDI_12
SDI_12
Resampling
Resampling
Figure 3. Channel Signal Flow Diagram through the Digital Core
2
I
S
Channel
Input
Re-sampling
Mapping
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.
2/41
System Contro
System Contro
l
l
Audio EQ, Mix,
Audio EQ, Mix,
Input,
Input,
Crossver,
Crossver,
Channel
Channel
Volume, Limiter
Volume, Limiter
Processing
Processing
System Timing
System Timing
PLL
PLL
CLK
CLK
EQ
Processing
DDX-SPIRIT
DDX-SPIRIT
®
®
DDX
DDX
Processing
Processing
TWARN
TWARN
FAULT
FAULT
Power-Down
Power-Down
Crossover
Volume
Mix
Filter
Limiter
S format.
2
OUT1A
OUT1A
Quad
Quad
OUT1B
OUT1B
Half-Bridge
Half-Bridge
Power Stage
Power Stage
OUT2A
OUT2A
OUT2B
OUT2B
EAPD
EAPD
4X
®
DDX
Interp
DDX
Output
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