Cirrus Logic CS42L73 - Manual (Page 109)

DS882F1 109
CS42L73
6.35 Limiter Control, Release Rate Speakerphone [A] (Address 2Ah)
6.35.1 Peak Detect and Limiter Speakerphone [A]
Configures the peak detect and limiter circuitry.
6.35.2 Peak Signal Limit All Channels Speakerphone
Sets how stereo Speakerphone channels (SPK [A] and ESL [B]) are attenuated when the limiter is en-
abled.
6.35.3 Limiter Release Rate Speakerphone [A]
If limiter release volume changes are configured to occur with a soft ramp, this register sets the soft-ramp
rate by specifying the soft-ramp step period size.
7 6 5 4 3 2 1 0
LIMITSPK LIMIT_ALLSPK LIMRRATESPK5 LIMRRATESPK4 LIMRRATESPK3 LIMRRATESPK2 LIMRRATESPK1 LIMRRATESPK0
LIMITSPK Limiter Status
0 Disabled
1 Enabled
LIMIT_ALLSPK Limiter action:
0 Apply the necessary attenuation on a specific channel only if the signal amplitudes on that specific channel
rise above LMAXSPK [for A channel]/LMAXESL [for B channel].
Remove attenuation on a specific channel only if the signal amplitude on that specific channel falls below
CUSHSPK [for A channel]/CUSHESL [for B channel].
Speakerphone [A channel] Limiter attack and release rates are as per LIMARATESPK and LIMRRATESPK.
Ear Speaker/Speakerphone Line Out [B channel] Limiter attack and release rates are as per LIMARATEESL
and LIMRRATEESL.
1 Apply necessary attenuation on BOTH channels if signal amplitude on any ONE channel exceeds LMAXSPK.
Remove attenuation on BOTH channels only if the signal amplitude on BOTH channels fall below CUSHSPK.
Both channels Limiter attack and release rates are as per LIMARATESPK and LIMRRATESPK.
LIMRRATESPK[5:0] Step Period Size
00 0000
1 (Fastest Release)
··· ···
11 1111 1008 (Slowest Release)
Formula: Step Period Size = MAXIMUM_OF(1, 16 x LIMRRATESPK)