CS42L55 Datasheet, PDF (46/73 Pages) Cirrus Logic – Ultra Low Power, Stereo CODEC w/Class H Headphone Amp

6.7.2
CS42L55
Analog Zero Cross
Configures when the signal level changes occur for the analog volume controls.
ANLGZCx
0
1
Volume Changes
Do not occur on a zero cross-
ing
Occur on a zero crossing
Affected Analog Volume Controls
PGAx_VOL[5:0] (“PGAx Volume” on page 49)
HPxMUTE (“Headphone Channel x Mute” on page 57)
HPxVOL[6:0] (“Headphone Volume Control” on page 57)
LINExMUTE (“Line Channel x Mute” on page 58)
LINExVOL[6:0] (“Line Volume Control” on page 58)
Note: If the signal does not encounter a zero crossing, the requested volume change will occur after a
timeout period of 1024 sample periods (approximately 10.7 ms at 48 kHz sample rate).
6.7.3
Digital Soft Ramp
Configures an incremental volume ramp from the current level to the new level at the specified rate.
DIGSFT
0
1
Ramp Rate:
Volume Changes
Do not occur with a soft ramp
Occur with a soft ramp
1/8 dB every LRCK cycle
Affected Digital Volume Controls
ADCxMUTE (“ADC Mute” on page 48)
ADCxATT[7:0] (“ADCx Volume” on page 50)
AMIXxMUTE (“ADC Mixer Channel x Mute” on page 51)
AMIXxVOL[6:0] (“ADC Mixer Channel x Volume” on page 51)
PMIXxMUTE (“PCM Mixer Channel x Mute” on page 52)
PMIXxVOL[6:0] (“PCM Mixer Channel x Volume” on page 52)
MSTxMUTE (“Master Playback Mute” on page 51)
MSTxVOL[7:0] (“Master Volume Control” on page 57)
6.7.4
Freeze Registers
Configures a hold on all register settings.
FREEZE
0
1
Control Port Status
Register changes take effect immediately
Modifications may be made to all control port registers without the changes taking effect until after the
FREEZE is disabled.
6.8 ADC, Line, HP MUX (Address 08h)
7
ADCBMUX1
6
ADCBMUX0
5
ADCAMUX1
4
ADCAMUX0
3
LINEBMUX
2
LINEAMUX
1
HPBMUX
6.8.1
ADC x Input Select
Selects the specified analog input signal into ADCx.
ADCxMUX[1:0]
00
01
10
11
Selected Input to ADCx
PGAx - Use PGAxMUX bit (“PGA x Input Select” on page 49) to select an input channel.
AIN1x; PGA is bypassed
AIN2x; PGA is bypassed
Reserved
Note: Pseudo-differential inputs are not available when the PGA is bypassed.
0
HPAMUX
46
DS773F1