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DAC3550A Arkusz danych(PDF) 6 Page - Micronas

Numer części DAC3550A
Szczegółowy opis  DAC 3550A STEREO AUDIO DAC
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Producent  MICRONAS [Micronas]
Strona internetowa  http://www.micronas.com
Logo MICRONAS - Micronas

DAC3550A Arkusz danych(HTML) 6 Page - Micronas

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DAC 3550A
6
Micronas
2.2. Interpolation Filter
The interpolation filter increases the sampling rate by a
factor of 8. The characteristic for fsaudio = 48 kHz is
shown in Fig. 2–3.
Fig. 2–3: 1
→8 Interpolation filter; frequency range:
0...22 kHz
2.3. Variable Sample and Hold
The advantage of this system is that even at low sam-
ple frequencies the out-of-band noise is not scaled
down to audible frequencies.
2.4. 3rd-order Noise Shaper and Multibit DAC
The 3rd-order noise shaper converts the oversampled
audio signal into a 5-bit noise-shaping signal at a high
sampling rate. This technique results in extremely low
quantization noise in the audio band.
2.5. Analog Low-pass
The analog low-pass is a first order filter with a cut-off
frequency of approximately 1.4 MHz which removes
the high-frequency components of the noise-shaping
signal.
2.6. Input Select and Mixing Matrix
This block is used to switch between or mix the auxil-
iary inputs and the signals coming from the DAC. A
switch matrix allows to select between mono and ste-
reo mode as shown in Fig. 2–4.
Fig. 2–4: Switch matrix
Mono mode is realized by adding left and right
channel.
2.7. Postfilter Op Amps, Deemphasis Op Amps,
and Line-Out
This block contains the active components for the ana-
log postfilters and the deemphasis network. The
op amps and all I/O-pins for this block are shown in
Fig. 2–5.
0
5000
10000
15000
20000
-0.14
-0.12
-0.1
-0.08
-0.06
-0.04
-0.02
0
dB
f/Hz
AUX1L
DAD
DAI
AUX1R
AUX2L
AUX2R
D/A
AUX_MS
24.576 MHz
FOUTR
FOUTL
-
-
-
-
WSI
INSEL_AUX2
INSEL_AUX1
INSEL_DAC


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