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AD1864N-J Datasheet(PDF) 8 Page - Analog Devices |
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AD1864N-J Datasheet(HTML) 8 Page - Analog Devices |
8 / 12 page AD1864 –8– REV. A 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 AD1864 S +V L –V TRIM MSB SJ DL LL DGND AGND OUT V OUT I R F –VS OUT I +V L OUT V TRIM MSB LR CLK DR AGND SJ R F 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 S +V LEFT CHANNEL OUTPUT RIGHT CHANNEL OUTPUT –5V ANALOG SUPPLY +5V ANALOG SUPPLY +5V DIGITAL SUPPLY –5V DIGITAL SUPPLY BCKO WCKO DOL DOR VDD DG OW18 OW20 SM5813AP/A PT AD712 OR NE5532 VSS1 VSS2 Figure 11. Complete 8 × F S 18-Bit CD Player 8-BIT CD PLAYER DESIGN Figure 11 illustrates an 18-bit CD player design incorporating an AD1864 D/A converter, an AD712 or NE5532 dual op amp and the SM5813 digital filter chip manufactured by NPC. In this design, the SM5813 filter transmits left and right digital data to both channels of the AD1864. 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 AD1864. Note that no external components are required by the AD1864. Also, no deglitching circuitry is required. An AD712 or 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 created from the combination of the internal feedback resistors (RF) and the external capacitors C1 and C2. For example, the nominal 3 k Ω RF with a 360 pF capacitor for C1 and C2 will place a pole at approximately 147 kHz, effec- tively eliminating all high frequency noise components. Close matching of the ac characteristics of the amplifiers on the AD712 as well as their low distortion make it an ideal choice for the task. LOW distortion, superior channel separation, low power consumption and a low component count are all realized by this simple design. |
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