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DS2165Q Datasheet(PDF) 11 Page - Dallas Semiconductor |
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DS2165Q Datasheet(HTML) 11 Page - Dallas Semiconductor |
11 / 17 page DS2165Q 11 of 17 PCM AND ADPCM INPUT/OUTPUT Since the organization of the input and output time slots on the DS2165Q does not depend on the algorithm selected, it always assumes that PCM input and output are in 8-bit bytes and that ADPCM input and output are in 4-bit bytes. Figure 12 demonstrates how the DS2165Q handles the I/O for the three different algorithms. In the figure, it is assumed that channel X is in the compression mode (CP/ EX = 1) and channel Y is in the expansion mode (CP/ EX = 0). Also, it is assumed that both the input and output time slots for both channels are set to 0. Figure 12. PCM AND ADPCM I/O EXAMPLE Note 1: The bit after the LSB in the 24kbps ADPCM output is only a 1 when the DS2165Q is operated in the software mode and is programmed to perform 24kbps compression; in all other configurations, it is a 0. |
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