CS4360 Datasheet, PDF (17/36 Pages) Cirrus Logic – 24-Bit, 192 kHz 6 Channel D/A Converter

CS4360
4.4.2 VOLUME CONTROL (XX_VOL)
Default = 0
Function:
The Digital Volume Control registers allow independent control of the signal levels in 1 dB increments
from 0 to -119 dB. Volume settings are decoded as shown in Table 3. The volume changes are im-
plemented as dictated by the Soft Ramp and Zero Cross bits. All volume settings less than -119 dB
are equivalent to enabling the MUTE bit.
Binary Code
0001010
0010100
0101000
0111100
1011010
Decimal Value
0
-20
-40
-60
-90
Volume Setting
dB
-20 dB
-40 dB
-60 dB
-90 dB
Table 3. Example Digital Volume Settings
4.5 Mode Control 2 (address 0Dh)
7
SZC1
1
6
SZC0
0
5
CPEN
0
4
PDN
1
3
POPG
1
2
FREEZE
0
1
MCLKDIV
0
0
SNGLVOL
0
4.5.1
SOFT RAMP AND ZERO CROSS CONTROL (SZC)
Default = 10
00 - Immediate Change
01 - Zero Cross
10 - Soft Ramp
11 - Soft Ramp and Zero Cross
Function:
Immediate Change
When Immediate Change is selected all level changes will be implemented immediately in one step.
Zero Cross
Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will
occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur
after a timeout period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample
rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-
itored and implemented for each channel.
Soft Ramp
Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally
ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock
periods.
Soft Ramp and Zero Cross
Soft Ramp and Zero Cross dictates that signal level changes, either by attenuation changes or mut-
ing, will occur in 1/8 dB steps and will be implemented on successive signal zero crossings. The 1/8
dB level changes will occur after timeout periods between 512 and 1024 sample periods (10.7 ms to
21.3 ms at 48 kHz sample rate) if the signal does not encounter zero crossings. The zero cross func-
tion is independently monitored and implemented for each channel.
DS517PP1
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