Instruction Manual

46 DS773F1

CS42L55

6.7.2 Analog Zero Cross

Configures when the signal level changes occur for the analog volume controls.

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.

6.7.4 Freeze Registers

Configures a hold on all register settings.

6.8 ADC, Line, HP MUX (Address 08h)

6.8.1 ADC x Input Select

Selects the specified analog input signal into ADCx.

Note: Pseudo-differential inputs are not available when the PGA is bypassed.

ANLGZCx Volume Changes Affected Analog Volume Controls

Do not occur on a zero cross-

ing

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)

1 Occur on a zero crossing

DIGSFT Volume Changes Affected Digital Volume Controls

0 Do not occur with a soft ramp 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)

1 Occur with a soft ramp

Ramp Rate: 1/8 dB every LRCK cycle

FREEZE Control Port Status

0 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.

7 6 5 4 3210

ADCBMUX1 ADCBMUX0 ADCAMUX1 ADCAMUX0 LINEBMUX LINEAMUX HPBMUX HPAMUX

ADCxMUX[1:0] Selected Input to ADCx

00 PGAx - Use PGAxMUX bit (“PGA x Input Select” on page 49) to select an input channel.

01 AIN1x; PGA is bypassed

10 AIN2x; PGA is bypassed

11 Reserved