CS42406 Datasheet, PDF (45/50 Pages) Cirrus Logic – 24-BIT, 192kHz 2-IN 6-OUT AUDIO CODEC

CS42406
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 input
sample rate) if the signal does not encounter a zero crossing. The zero cross function is independent-
ly monitored 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 DAC_LRCK
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 input sample rate) if the signal does not encounter zero crossings. The zero cross
function is independently monitored and implemented for each channel.
6.5.2
CONTROL PORT ENABLE (CPEN) BIT 5
Default = 0
0 - Disabled
1 - Enabled
Function:
The Control Port will become active and reset to the default settings when this function is enabled.
6.5.3
POWER DOWN (PDN) BIT 4
Default = 1
0 - Disabled
1 - Enabled
Function:
The DAC will enter a low-power state when this function is enabled, but the contents of the control
registers will be retained in this mode. The power-down bit defaults to ‘enabled’ on power-up and must
be disabled before normal operation in Control Port mode can occur.
6.5.4
POPGUARD® TRANSIENT CONTROL (POPG) BIT 3
Default = 1
0 - Disabled
1 - Enabled
Function:
The PopGuard^® Transient Control allows the quiescent voltage to slowly ramp to and from 0 volts to
the quiescent voltage during power-on or power-off when this function is enabled. Please see section
4.7 for implementation details.
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