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AD1892JRRL датащи(PDF) 8 Page - Analog Devices |
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AD1892JRRL датащи(HTML) 8 Page - Analog Devices |
8 / 24 page AD1892 –8– REV. 0 SERIAL DIGITAL AUDIO TRANSMISSION STANDARDS The AD1892 can receive S/PDIF (Sony/Philips Digital Interface Format), AES/EBU (Audio Engineering Society/European Broadcasting Union, also known as AES3-1992), IEC-958 (International Electrotechnical Commission) and CP-340 (EIAJ [Electronic Industry Association of Japan] CP-1201) serial streams. S/PDIF is a consumer audio standard, and AES/EBU is a professional audio standard; IEC-958 and CP-340 have both consumer and professional definitions. This data sheet is not intended to fully define or to provide a tutorial for these standards; please contact these international standards setting bodies for the full specifications. All of these digital audio serial communication schemes encode audio data and audio control information using the biphase- mark method. This encoding method minimizes the dc content of the transmitted signal and allows the receiver to decode clock information from the transmitted signal. As can be seen from Figure 1, ones in the original data end up with midcell transi- tions in the biphase-mark encoded data, while zeros in the origi- nal data do not. Note that the biphase-mark encoded data always has a transition between bit boundaries. 01 1 1 0 0 0 1 0 0 1 0 1 0 1 11 1 BIPHASE-MARK DATA DATA CLOCK (2 TIMES BIT RATE) Figure 1. Biphase-Mark Encoding Digital audio communication schemes use “preambles” to dis- tinguish between channels (called “subframes”) and between longer term control information blocks (called “frames”). Pre- ambles are particular biphase-mark patterns, which contain encoding violations that allow the receiver to uniquely recognize them. These patterns, and their relationship to frames and subframes, are shown in Figures 2 and 3. BIPHASE PATTERNS 11100010 OR 00011101 11100100 OR 00011011 11101000 OR 00010111 CHANNEL X Y Z LEFT RIGHT LEFT AND C.S. BLOCK START Figure 2. Biphase-Mark Encoded Preambles PREAMBLES X LEFT CH Y RIGHT CH Z LEFT CH Y RIGHT CH X LEFT CH Y RIGHT CH X FRAME 191 FRAME 0 FRAME 1 START OF CHANNEL STATUS BLOCK SUB- FRAME SUB- FRAME Figure 3. Preambles, Frames and Subframes The biphase-mark encoding violations are shown in Figure 4. Note that all three preambles include encoding violations. Or- dinarily, the biphase-mark encoding method results in a polarity transition between bit boundaries. PREAMBLE X PREAMBLE Y PREAMBLE Z 11 0 1 100 0 11 0 0 10 1 0 11 1 0 100 0 Figure 4. Preambles As noted above, these serial digital audio communication schemes are organized using a frame and subframe construction. There are two subframes per frame (ordinarily the left and right channel). Each subframe includes the appropriate four bit preamble, four bits of “auxiliary” (aux) data, 20 bits of audio data (LSB first), a “validity” (V) bit, a “user” (U) data bit, a Channel Status (C) bit and an even parity (P) bit. The Channel Status bits and the user bits accumulate over many frames to convey control information. The Channel Status bits accumu- late over a 192 frame period (called a Channel Status block). The user bits accumulate over 1176 frames when the inter- connect is implementing the so-called “subcode” scheme (EIAJ CP-2401). The organization of the Channel Status block, frames and subframes is shown in Figure 5. |
Аналогичный номер детали - AD1892JRRL |
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Аналогичное описание - AD1892JRRL |
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