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AD1866N датащи(PDF) 9 Page - Analog Devices |
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AD1866N датащи(HTML) 9 Page - Analog Devices |
9 / 12 page REV. 0 –9– In summary, the AD1866 is an excellent choice for multimedia, battery operated portable or automotive digital audio systems. In the following sections, some examples of high performance audio applications featuring the AD1866 are described. AD1866 with the Sony CXD2550P Digital Filter Figure 11 illustrates a 16-bit CD player design incorporating an AD1866 DAC, a Sony CXD2550P digital filter, and 2-pole antialias filters. This high performance, single supply design op- erates at 8 × F S and is suitable for portable and automotive ap- plications. In this design, the CXD2550P filter transmits left and right channel digital data to the AD1866. The left and right latch signals, LL and LR, are both provided by the word clock signal (LRCKO) of the digital filter. The digital data is con- verted to low distortion output voltages by the output amplifiers on the AD1866. Also, no deglitching circuitry or external ad- justments are required. Bypass capacitors, noise reduction capacitors and the antialias filter details are omitted for clarity. ADDITIONAL APPLICATIONS In addition to CD player designs, the AD1866 is suited for similar applications such as DAT, portable musical instruments, laptop and notebook personal computers, and PC audio I/O boards. The circuit techniques illustrated here are directly ap- plicable in those applications. Figures 12, 13, 14, and 15 show connection diagrams for the AD1866 and several popular digital filter chips from NPC and Yamaha. Each application operates at 8 × F S operation. Please refer to the appropriate sections of this data sheet for additional information. APPLICATIONS OF THE AD1866 The AD1866 is a high performance audio DAC specifically de- signed for portable and automotive digital audio applications. These market segments have technical requirements fundamen- tally different than those found in the high-end or home use market segment. Portable equipment must rely on components which require low amounts of power to offer reasonable play- back times. Also, battery voltage tends to diminish as the end of the discharge cycle is approached. The AD1866’s ability to op- erate from a single +5 V supply makes it a good choice for bat- tery operated gear. And, as the battery voltage drops, the power dissipation of the AD1866 drops. This extends the usable bat- tery life. Finally, as the battery supply voltage drops, the bias voltages and signal swings also drop, preventing signal clipping and abrupt degradation of distortion. Figure 3 illustrates how the THD+N performance of the AD1866 remains constant through a wide supply voltage range. Automotive equipment relies on components which are able to consistently perform over a wide range of temperatures. In addi- tion, due to the limited space available in automotive applica- tions, small size is essential. The AD1866 has guaranteed operation between –35 °C and +85°C, and the 16-pin DIP or 16-pin SOIC package is particularly attractive where overall size is important. Since the AD1866 provides dc bias voltages, the entire signal chain can be dc coupled. This eliminates ac coupling capacitors from the signal path, improving low frequency performance and lowering system cost and size. 15 14 13 12 11 10 16 9 1 2 3 4 5 6 8 7 8 7 6 5 2 3 1 4 +5V POWER SUPPLY LEFT CHANNEL OUTPUT RIGHT CHANNEL OUTPUT AD1866 LL DL CLK DR LR DGND 1 2 3 4 5 6 7 8 9 18 10 15 14 12 11 16 17 13 TEST CXD2550P LRCK SLOT DATAR BCKO LATCH DATAL LRCKO VDD NRL AGND NRR 1000 pF 6.8k Ω 330 pF NJM2100 1000 pF 330 pF VSS VSS VL VS VBL VOL VOR VBRVS +VS 6.8k Ω 6.8k Ω 6.8k Ω 6.8k Ω 6.8k Ω Figure 11. AD1866 with Sony CXD2550P Digital Filter Applications of the AD1866 |
Аналогичный номер детали - AD1866N |
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Аналогичное описание - AD1866N |
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