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PDF SAA7712 Data sheet ( Hoja de datos )
| Número de pieza | SAA7712 | |
| Descripción | Sound effects DSP | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
SAA7712H
Sound effects DSP
Preliminary specification
File under Integrated Circuits, IC02
1999 Aug 05
1 page  
Philips Semiconductors
Sound effects DSP
Preliminary specification
SAA7712H
4 QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITION
VDD3V
supply voltage 3.3 V analog
and digital
with respect to VSS
VDD5V
IDDD3V
supply voltage 5 V periphery with respect to VSS
DC supply current of the 3.3 V at fDSP18; maximum activity
digital core part
of the DSP
IDDD5V
IDDA
DC supply current of the 5 V
digital periphery part
DC supply current of the
analog part
at fDSP18; maximum activity
of the DSP; VDD5 = 5 V
at fDSP18; maximum activity
of the DSP; VDD5 = 3.3 V
at zero input and output
signal
Ptot
total power dissipation
at fDSP18; maximum activity
of the DSP
(THD + N)/S DAC total harmonic
RL > 5 kΩ; f = 1 kHz;
distortion-plus-noise to output A-weighted
signal
DRDAC
DAC dynamic range
f = 1 kHz; −60 dB;
A-weighted
DSDAC
DAC digital silence
f = 20 Hz to 17 kHz;
A-weighted
fxtal
fDSP16
fDSP18
crystal frequency
DSP clock frequency
DSP clock frequency
fxtal = 16.384 MHz
fxtal = 18.432 MHz
MIN. TYP. MAX. UNIT
3 3.3 3.6 V
3
3.3 or 5 5.5
V
− − 80 mA
− − 5 mA
− − 5 mA
− − 10 mA
− − 0.4 W
− −75 −60 dBA
90 96
− −107
10.000
−
−
−
−
−
− dBA
−102 dBA
19.456
32.256
32.544
MHz
MHz
MHz
5 ORDERING INFORMATION
TYPE
NUMBER
SAA7712H
NAME
QFP80
PACKAGE
DESCRIPTION
plastic quad flat package; 80 leads (lead length 1.95 mm);
body 14 × 20 × 2.7 mm; high stand-off height
VERSION
SOT318-1
1999 Aug 05
5
5 Page 
Philips Semiconductors
Sound effects DSP
Preliminary specification
SAA7712H
8 FUNCTIONAL DESCRIPTION
8.1 Analog outputs
8.1.1 ANALOG OUTPUT CIRCUIT
Depending on the configuration of the equalizer sections,
the SAA7712H has 2 or 4 analog outputs which are
supplied by the same power supply. Each of these outputs
has a voltage and a current pin (see Fig.3). The signals are
available on 2 outputs (OUT0 and OUT1), or 4 outputs
(OUT0, OUT1, OUT2 and OUT3).
handbook, halfpage
OUT0_I
(OUT1_I)
BIT 0 to 13
MSB
Vref
DAC
MGS208
OUT0_V
(OUT1_V)
Fig.3 Analog output circuit.
8.1.3 DACS
Each of the four low noise high dynamic range DACs
consists of a signed-magnitude DAC with current output,
followed by a buffer operational amplifier.
8.1.4 UPSAMPLE FILTER
To reduce spectral components above the audio band, a
fixed 4 times oversampling and interpolating digital filter is
used. The filters give an out-of-audio-band attenuation of
at least 29 dB. The filter is followed by a first-order noise
shaper to expand the dynamic range to more than 105 dB.
The band around multiples of the sample frequency of the
DAC (4fs) is not affected by the digital filter. A capacitor
must be added in parallel with the DAC output amplifier to
attenuate this out-of-band noise further to an acceptable
level.
In Fig.4 the overall frequency spectrum at the DAC audio
output without external capacitor or low-pass filter for the
audio sampling frequencies of 38 kHz is shown. In Fig.5
the detailed spectrum around fs is shown for an fs of
38, 44.1 and 48 kHz. The pass band bandwidth (−3 dB) is
1⁄2fs.
8.1.2 DAC FREQUENCY
The sample rate (fs) of the selected source is the frame
rate of the DSP. The word clock for the upsample filter and
the clock for the DACs, at 4fs, are derived internally from
the word select of the selected audio source.
1999 Aug 05
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SAA7712.PDF ] | |
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