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CXD2559 Datasheet(PDF) 9 Page - Intersil Corporation |
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CXD2559 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 11 page 4-9 D. Digital Attenuator [Related pins] ATT, SHIFT, LATCH The output data can be attenuated independently in the L and R channels, using the transfer data from the external microcomputer. The ATT data of the L and R channels consist of eight bits each, and the L and R channels can be attenuated com- monly using the ATT control bit. (The L channel attenuation value is used when the L and R channels are commonly attenuated). (1) Command and Audio Output The attenuation data of the L and R channels consist of eight bits, it can be set 255 ways. The following table shows the relationship between the commands and the outputs. The attenuation values for 01 (H) to FE (H) can be obtained with the following equation: E. Digital Attenuator Suppose that there are attenuation data ATT1, ATT2 and ATT3, and their relationship is ATT1>ATT3>ATT2. When ATT2 is transferred before the level reaches the value of ATT1 (point A in the figure), the level keeps approaching to the value of ATT2. Next, when ATT3 is transferred before the level reaches the value of ATT2 (point B or C in the fig- ure), the level starts approaching to the value of ATT3 from its level at that time (point B or C in the figure). The transition (0 dB to → –∞) between the attenuation data is 1024/FS (FS = 44kHz for CD). F. Output Selection [Related pins] ATT, SHIFT, LATCH The L and R channel outputs can be set in four combinations [L/RL + R/Mute] (16 ways in total) using the transfer data from the external microcomputer. The following table shows the relationship between the commands and the outputs. CONTROL BIT CONTROL WHEN SYSTEM IS CLEARED L7 TO L0 The L channel attenuation data. FF (H) R7 to R0 The R channel attenuation data. FF (H) P3 to P0 Output selection. 9 (H) Stereo E De-emphasis (High = on, Low = off) However, the time constant of the emphasis is γ 1 = 50µs and γ 2 = 15µs when FS = 44.1kHz. The de-emphasis function cannot be used when FS is not 44.1kHz. OFF A Attenuate (Low = independent, High = common). However, the L channel attenuation value is used when the L and R channels are commonly atten- uated. Independent XDon’t care. NOTE: When the data is more than three bytes are transferred to the ATT pin, only the three bytes transferred finally are effective. ATTENUATION DATA L7 TO L0/R7 TO R0 AUDIO OUTPUT FF (H) 0dB FE (H) ↓ 01 (H) -0.034dB ↓ -48.131dB 00 (H) - ∞ ATT = 20log [Input data/255] dB Ex. for attenuating data FA (H) ATT = 20log [250/255] db = 0.172dB 0dB A ATT1 B ATT3 C ATT2 FIGURE 7. METHOD OF OBTAINING AN ATTENUATION VALUE HI2559, CXD2559 |
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