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WM8594 Datasheet(PDF) 36 Page - Wolfson Microelectronics plc |
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WM8594 Datasheet(HTML) 36 Page - Wolfson Microelectronics plc |
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36 / 78 page  WM8594 Product Preview w PP Rev 1.0 January 2007 36 VOLUME RAMP Analogue volume can be adjusted by step change or by soft ramp. The ramp rate is dependent upon the sampling rate. The sampling rate upon which the volume ramp rate is based can be selected between the DAC sampling rate or the ADC sampling rate in either slave mode or master mode. The ramp rates for common audio sample rates are shown in Table 28: SAMPLE RATE FOR PGA (kHz) DIVIDE BY PGA Ramp Rate (ms/dB) 32 8 0.50 44.1 8 0.36 48 8 0.33 88.2 16 0.36 96 16 0.33 176.4 32 0.36 192 32 0.33 Table 28 Analogue Volume Ramp Rate For example, when using a sample rate of 48kHz, the time taken for a volume change from and initial setting of 0dB to -20dB is calculated as follows: Volume Change (dB) x PGA Ramp Rate (ms/dB) = 20 x 0.33 = 6.6ms When changing from one PGA ramp clock source to another, it is recommended that PGA_SAFE_SW is set to 0. This forces the clock switch over to occur at a point where all relevant clock signals are zero, ensuring glitch-free operation. This process can take up to 32 left/right clock cycles. If a faster change in PGA ramp rate clock source is required, PGA_SAFE_SW can be set to 1. This forces the change in clock source to occur immediately regardless of the state of the relevant clock signals internally. Glitch-free operation is not guaranteed under these conditions. If the volume ramp function is not required when increasing or decreasing volume, this block can be bypassed by setting ATTACK_BYPASS or DECAY_BYPASS to 1. Figure 18 shows the effect of these register settings: DECAY_BYPASS=0 DECAY_BYPASS=1 ATTACK_BYPASS=0 ATTACK_BYPASS=1 Figure 18 ATTACK_BYPASS and DECAY_BYPASS functionality Note: When ATTACK_BYPASS=1 or DECAY_BYPASS=1, it is recommended that the zero cross function for the PGA is used to eliminate click noise when changing volume settings. |
Similar Part No. - WM8594_07 |
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Similar Description - WM8594_07 |
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