CS4265-CNZR Cirrus Logic Inc, CS4265-CNZR Datasheet - Page 41

• Manufacturer Part Number: CS4265-CNZR
• Description: IC,Soundcard Circuits,LLCC,32PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

DS657F2
6.11
6.11.1 Volume Control (Bits 7:0)
6.12
6.12.1 DAC Soft Ramp or Zero Cross Enable (Bits 7:6)
DACSoft
Vol7
7
7
DAC Channel B Volume Control - Address 0Bh
DAC Control 2 - Address 0Ch
Function:
The digital volume control allows the user to attenuate the signal in 0.5 dB increments from 0 to -127 dB.
The Vol0 bit activates a 0.5 dB attenuation when set, and no attenuation when cleared. The Vol[7:1] bits
activate attenuation equal to their decimal equivalent (in dB). Example volume settings are decoded as
shown in
Cross bits in the DAC Control 2 register (see
Function:
Soft Ramp Enable
Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally ramp-
ing, 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.
See
Zero Cross Enable
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 time-
out 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 monitored and implemented
for each channel. See
Soft Ramp and Zero Cross Enable
Soft Ramp and Zero Cross Enable dictate that signal-level changes, either by attenuation changes or mut-
ing, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level change will
occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sam-
Table
DACZero
Vol6
Table
6
6
16.
15. The volume changes are implemented as dictated by the DACSoft and DACZero-
InvertDAC
Table
Table 15. Digital Volume Control Example Settings
Vol5
5
5
Binary Code
00000000
00000001
00101000
00101001
11111110
11111111
16.
Reserved
Vol4
4
4
Section
Reserved
Vol3
Volume Setting
6.12.1).
3
3
-127.5 dB
-20.5 dB
-127 dB
-0.5 dB
-20 dB
0 dB
Reserved
Vol2
2
2
Reserved
Vol1
1
1
CS4265
Reserved
Vol0
0
0
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