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AD1865 Arkusz danych(PDF) 8 Page - Analog Devices |
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AD1865 Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 12 page AD1865 REV. 0 –8– 18-BIT CD PLAYER DESIGN Figure 10 illustrates an 18-bit CD player design incorporating an AD1865 D/A converter, an NE5532 dual op amp and the SM5813 digital filter chip manufactured by NPC. In this de- sign, the SM5813 filter transmits left and right digital data to both channels of the AD1865. The left and right latch signals, LL and LR, are both provided by the word clock signal (WCKO) of the digital filter. The digital filter supplies data at an 8 × F S oversample rate to each channel. The digital data is converted to analog output voltages by the output amplifiers on the AD1865. Note that no external compo- nents are required by the AD1865. Also, no deglitching cir- cuitry is required. An NE5532 dual op amp is used to provide the output antialias filters required for adequate image rejection. One 2-pole filter section is provided for each channel. An additional pole is cre- ated from the combination of the internal feedback resistors (RF) and the external capacitors C1 and C2. For example, the nominal 3 k Ω R F with a 360 pF capacitor for C1 and C2 will place a pole at approximately 147 kHz, effectively eliminating all high frequency noise components. Low distortion, superior channel separation, low power con- sumption and a low parts count are all realized by this simple design. 2 4 5 6 1 3 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 AD1865 +VS TRIM MSB SJ DL LL DGND AGND VOUT RF –VS IOUT +VL VOUT TRIM MSB LR CLK DR AGND SJ RF 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 C1 C2 1 2 3 4 5 6 7 8 –VS +VS LEFT CHANNEL OUTPUT RIGHT CHANNEL OUTPUT –5V ANALOG SUPPLY +5V ANALOG SUPPLY +5V DIGITAL SUPPLY BCKO WCKO DOL DOR VDD DG OW20 SM5813AP/ APT NC NE5532 IOUT VSS1 VSS2 OW18 Figure 10. Complete 8 × F S 18-Bit CD Player |
Podobny numer części - AD1865 |
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Podobny opis - AD1865 |
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