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WM8533 датащи(PDF) 26 Page - Wolfson Microelectronics plc

номер детали WM8533
подробное описание детали  24-bit 192kHz Stereo DAC with 2Vrms Ground Referenced Line Output
PDF  41 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8533 датащи(HTML) 26 Page - Wolfson Microelectronics plc

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WM8533
Production Data
w
PD, July 2012, Rev 4.0
26
The effect of the volume ramp is illustrated in Figure 23.
Figure 23 Volume Ramp Functionality
Ramp Volume Changes
If ramp volume changes are selected, the ramp rate is dependent upon the sampling rate. The ramp
rates for common audio sample rates are shown in Table 15.
SAMPLE RATE FOR DAC (kHz)
GAIN RAMP RATE
(ms/dB)
8
1
32
0.25
44.1
0.18
48
0.17
88.2
0.1
96
0.08
176.4
0.05
192
0.04
Table 15 Volume Ramp Rate
For example, when using a sample rate of 48kHz, the time taken for a volume change from an initial
setting of 0dB to -20dB is calculated as follows:
Volume Change (dB) x Volume Ramp Rate (ms/dB) = 20 x 0.17 = 3.4ms
Zero cross is not used when ramping. The volume level in the DAC is set by the user in 0.25dB
increments, but during the volume ramp increments of 0.125dB are actually used. This step size is
inaudible and means there is no requirement to wait until a zero crossing occurs. Another benefit of
not using zero cross when ramping is that predictable ramp times are produced – there is no signal
dependency on the ramp time.



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