參數(shù)資料
型號： CS42L52-DNZR
廠商： CIRRUS LOGIC INC
元件分類： 消費家電
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC40
封裝： 6 X 6 MM, LEAD FREE, MO-220, QFN-40
文件頁數(shù)： 25/59頁
文件大?。?/td> 1800K
代理商： CS42L52-DNZR
DS680F1
31
CS42L52
5/13/08
4.3.2
Limiter
When enabled, the limiter monitors the digital input signal before the DAC and PWM modulators, detects
when levels exceed the maximum threshold settings, and lowers the master volume at a programmable
attack rate below the maximum threshold. When the input signal level falls below the maximum threshold,
the AOUT volume returns to its original level set in the Master Volume Control register at a programmable
release rate. Attack and release rates are affected by the DAC soft-ramp/zero-cross settings and sample
rate, Fs. Limiter soft-ramp and zero-cross dependency may be independently enabled/disabled.
Notes:
1.
Recommended settings: Best limiting performance may be realized with the fastest attack and
slowest release setting with soft ramp enabled in the control registers. The MIN bits allow the user to
set a threshold slightly below the maximum threshold for hysteresis control - this cushions the sound
as the limiter attacks and releases.
2.
The Limiter maintains the output signal between the MIN and MAX thresholds. As the digital input
signal level changes, the level-controlled output may not always be the same but will always fall within
the thresholds.
Referenced Control
Register Location
MSTxVOL[7:0].....................
PMIXxVOL[6:0] ...................
OFFTIME[2:0] .....................
ONTIME[3:0] .......................
FREQ[3:0] ...........................
BEEP[1:0]............................
BEEPMIXDIS ......................
BPVOL[4:0] .........................
Referenced Control
Register Location
Limiter Controls ...................
Master Volume Control........
FREQ[3:0]
...
BPVOL[4:0]
ONTIME[3:0]
OFFTIME[2:0]
BEEP[1:0] =
'01'
BEEP[1:0] =
'10'
BEEP[1:0] =
'11'
SINGLE-BEEP: Beep turns on at a
configurable frequency (FREQ) and
volume (BPVOL) for the duration of
ONTIME. BEEP must be cleared
and set for additional beeps.
MULTI-BEEP: Beep turns on at a configurable frequency (FREQ)
and volume (BPVOL) for the duration of ONTIME and turns off for
the duration of OFFTIME. On and off cycles are repeated until
BEEP is cleared.
CONTINUOUS BEEP: Beep turns on at a configurable frequency (FREQ) and volume (BPVOL) and remains on
until BEEP is cleared.
Figure 13. Beep Configuration Options
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