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AKD4635 Datasheet(PDF) 43 Page - Asahi Kasei Microsystems |
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AKD4635 Datasheet(HTML) 43 Page - Asahi Kasei Microsystems |
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43 / 81 page  [AK4635] Rev. 0.6 2007/10 - 43 - ■ Input Digital Volume (Manual Mode) When ADCPF bit = “1” and ALC1 bit = “0”, ALC block becomes an input digital volume (manual mode). The digital volume’s gain is set by IVOL7-0 bits as shown in Table 22. The IVOL value is changed at zero cross or zero cross time out. The zero crossing timeout period is set by ZTM1-0 bits. IVOL7-0bits GAIN(0dB) Step F1H +36.0 F0H +35.625 EFH +35.25 : : 92H +0.375 91H 0.0 (default) 90H -0.375 : : 0.375dB 2H -53.625 1H -54.0 0H MUTE Table 22. Input Digital Volume Setting When writing to the IVOL7-0 bits continually, the control register should be written in an interval more than zero crossing timeout. If not, zero crossing counter could be reset at each time and volume is not be changed. However, it could be ignored when writing the same register value as the last time. At this time, zero crossing counter has not been reset, so it should be written in an interval less than zero crossing timeout. |
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