CS4245-CQZR Cirrus Logic Inc, CS4245-CQZR Datasheet - Page 48

• Manufacturer Part Number: CS4245-CQZR
• Description: IC,Soundcard Circuits,QFP,48PIN,PLASTIC
• Manufacturer: Cirrus Logic Inc

48
6.12
6.12.1 DAC Soft Ramp or Zero Cross Enable (Bits 7:6)
6.12.2 Invert DAC Output (Bit 5)
DACSoft
7
DAC Control 2 - Address 0Ch
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-
ple rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-
itored and implemented for each channel. See
Function:
When this bit is set, the output of the DAC is inverted.
Table
DACZero
DACSoft
Table
6
18.
0
0
1
1
17. The volume changes are implemented as dictated by the DACSoft and DACZero-
Table 18. DAC Soft Cross or Zero Cross Mode Selection
InvertDAC
Table
Table 17. Digital Volume Control Example Settings
DACZeroCross
5
Binary Code
00000000
00000001
00101000
00101001
11111110
11111111
18.
0
1
0
1
Reserved
4
Changes to affect immediately
Zero Cross enabled
Soft Ramp enabled
Soft Ramp and Zero Cross enabled (default)
Section
Table
Reserved
Volume Setting
18.
6.12.1).
3
-127.5 dB
-20.5 dB
-127 dB
-0.5 dB
-20 dB
0 dB
Mode
Reserved
2
Reserved
1
Active_H/L
CS4245
DS656F2
0