CS42L50 Datasheet, PDF (20/48 Pages) Cirrus Logic – Low Voltage, Stereo CODEC with headphone Amp

CS42L50
4.1.11 Analog I/O Control (address 03h)
7
MUTEL
0
6
MUTER
0
5
SZC1
1
4
SZC0
1
3
RESERVED
0
2
INDVC
0
1
0
L=R
HPFREEZE
0
0
4.1.12 LEFT/RIGHT CHANNEL MUTE (MUTE)
Default = 0
0 - Disabled
1 - Enabled
Function:
Digital mute of the left and right ADC channels.
4.1.13 SOFT RAMP AND ZERO CROSS ENABLE (SOFT/ZC)
Default = 11
00 - Change volume immediately
01 - Change volume at next zero cross time
10 - Change volume in 1dB steps
11 - Change volume in 1dB steps at every zero cross time
Function:
Soft Ramp Enable :
Soft Ramp allows level changes, both muting and attenuation, to be implemented via an incremental
ramp. Digital volume control is ramped from the current level to the new level at a rate of 1/8 dB per
left/right clock period. Analog volume control is ramped in 1 dB steps every 8 left/right clock periods in
Single Speed mode, and 1dB every 16 left/right clock periods in Double Speed mode.
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 tim-
eout period of 512 sample periods in Single Speed mode or 1024 sample periods in Double Speed mode
(approximately 10.7ms at 48kHz sample rate) if the signal does not encounter a zero crossing. The zero
cross function is independently monitored and implemented for each channel.
Soft Ramp and Zero Cross Enable :
Soft Ramp and Zero Cross enable dictates that signal level changes, either by attenuation changes or
muting, will occur in 1 dB steps and be implemented on a signal zero crossing. The level change will occur
after a timeout period of 512 sample periods in Single Speed mode or 1024 sample periods in Double
Speed mode (approximately 10.7 ms at 48kHz sample rate) if the signal does not encounter a zero cross-
ing. The zero cross function is independently monitored and implemented for each channel.
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DS544PP1