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DAC3550A Arkusz danych(PDF) 6 Page - Micronas |
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DAC3550A Arkusz danych(HTML) 6 Page - Micronas |
6 / 35 page 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 |
Podobny numer części - DAC3550A |
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Podobny opis - DAC3550A |
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