cs4360 Cirrus Logic, Inc., cs4360 Datasheet - Page 34

• Manufacturer Part Number: cs4360
• Description: 24-bit, 192 Khz 6-channel D/a Converter
• Manufacturer: Cirrus Logic, Inc.

34
6.5.2
6.5.3
6.5.4
Zero Cross
Soft Ramp
Soft Ramp and Zero Cross
Function:
Function:
Function:
CONTROL PORT ENABLE (CPEN)
POWER DOWN (PDN)
POPGUARD® TRANSIENT CONTROL (POPG)
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 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 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
function is independently monitored and implemented for each channel.
Default = 0
0 - Disabled
1 - Enabled
The Control Port will become active and reset to the default settings when this function is enabled.
Default = 1
0 - Disabled
1 - Enabled
The entire device 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.
Default = 1
0 - Disabled
1 - Enabled
The PopGuard
the quiescent voltage during power-on or power-off when this function is enabled. Please see section
4.6 for implementation details.
®
Transient Control allows the quiescent voltage to slowly ramp to and from 0 volts to
BIT 4
BIT 5
BIT 3
CS4360
DS517F2