FEDL22620-01
ML22620
FADE command
・
Command
0
0
0
0
1
1
0
0
1st byte
0
0
0
0
FCON2
FCON1
FCON0
FADE
2nd byte
The FADE command sets the Fade function. This command can be input regardless of the NCR signal status.
By using the fade function, the volume changes stepwise when the volume is changed by the CVOL command.
FADE
Description
0
Fade function disabled (initial value)
1
Fade function enabled
FCON2 to FCON0 set the volume that changes at every unit-time (sampling group period
*1
) when the volume is changed to
the volume set by the CVOL command or the PAN command.
FCON2
FCON1
FCON0
Description
0
0
0
Volume change in 0 dB × 128/32768 steps
0
0
1
Volume change in 0 dB × 64/32768 steps
0
1
0
Volume change in 0 dB × 32/32768 steps
0
1
1
Volume change in 0 dB × 16/32768 steps
1
0
0
Volume change in 0 dB × 8/32768 steps
1
0
1
Volume change in 0 dB × 4/32768 steps
1
1
0
Volume change in 0 dB × 2/32768 steps
1
1
1
Volume change in 0 dB × 1/32768 steps
The smaller the voltage step that changes for each sampling frequency group, the less the pop noise, but the longer the
transition time until the set volume is reached. The transition time is expressed by the following equation.
Volume-transition time for CVOL command.
=|[Current CVOL setting]-[New CVOL setting]|
× [Sampling-frequency group
*1
]
× {264 ÷ (256 ÷ 2^[FCON2-FCON0 setting])}
*2
*1 Sampling frequency group
At 10.7/21.3kHz:
23.44
μs
At 6.4/12.8/25.6kHz:
39.06μs
At 8.0/16.0/32.0kHz:
31.25μs
At 11.025/22.05/44.1kHz:
22.68μs
At 12.0/24.0/48.0kHz:
20.83μs
*2 Rounding up after the decimal point.
For the timing of the FADE command, refer to the "FADE command timing" in the timing chart.
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Summary of Contents for LAPIS Semiconductor ML22620
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