AD1953YSTRL7 Analog Devices Inc, AD1953YSTRL7 Datasheet - Page 12

• Manufacturer Part Number: AD1953YSTRL7
• Description: IC DSP DAC AUDIO3CH/26BIT 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SigmaDSP®r

Specifications of AD1953YSTRL7

• Rohs Status: RoHS non-compliant
• Number Of Bits: 26
• Data Interface: Serial
• Number Of Converters: 3
• Voltage Supply Source: Analog and Digital
• Power Dissipation (max): 540mW
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• For Use With: EVAL-AD1953EBZ - BOARD EVAL FOR AD1953 3CH 24BIT
• Settling Time: -

AD1953
SIGNAL PROCESSING
Signal Processing Overview
Figure 2 shows the signal processing flow diagram of the AD1953.
The AD1953 is designed to provide all common signal-processing
functions commonly used in 2.0 or 2.1 playback systems. A
7-biquad equalizer operates on the stereo input signal. The
output of this equalizer is fed to a 2-biquad crossover filter for
the main channels, and the mono sum of the left and right equalizer
outputs is fed to a 3-biquad crossover filter for the Sub channel.
Each of the three channels has independent delay compensa-
tion. There are two high quality compressor/limiters available:
one operating on the left/right outputs and one operating on the
subwoofer channel. The subwoofer output may be blended back
into the left/right outputs for 2.0 playback systems. In this
configuration, the two independent compressor/limiters provide
2-band compression, which significantly improves the sound
RIGHT
LEFT
IN
IN
DE-EMPHASIS
DE-EMPHASIS
SUB CHANNEL
HPF/
HPF/
L/R MIX
EQ AND CROSSOVER FILTERS
7 BIQUAD
7 BIQUAD
FILTERS
FILTERS
CROSSOVER
CROSSOVER
CROSSOVER
(2 FILTERS)
(3 FILTERS)
(2 FILTERS)
Figure 3. Graphical User Interface
Figure 2. Signal Processing Flow
1 BIQUAD
FILTER
SUB DYNAMICS PROCESSOR
–12–
(0ms–3.7ms)
(0ms–3.7ms)
DELAY
DELAY
LOOK-UP TABLE
LEVEL DETECT,
quality of compressed audio. In addition, the main channels
have a stereo widening algorithm that increases the perceived
spread of the stereo image.
Most of the signal processing functions are coded using full 48-bit
double-precision arithmetic. The input word length is 24 bits,
with two extra headroom bits added in the processor to allow
internal gains up to 12 dB without clipping (additional gains can
be accommodated by scaling down the input signal in the first
biquad filter section).
A graphical user interface (GUI) is available for evaluation of
the AD1953 (Figure 3). This GUI controls all of the functions
of the chip in a very straightforward and user-friendly interface.
No code needs to be written to use the GUI to control the chip.
For more information on AD1953 software tools, send an email to
[e-mail].
L/R DYNAMICS PROCESSOR
(0ms–2.3ms)
(0ms–2.3ms)
DELAY
DELAY
LOOK-UP TABLE
LEVEL DETECT,
(0ms–3.7ms)
DELAY
MONO DAC
INTERPOLATION
INTERPOLATION
L/R REINJECTION
SUBWOOFER
LEVEL
8
8
OUTPUT
DAC
DAC
REV. 0
OUT
LEFT
OUT
RIGHT