CS42L56 datasheet(39/92 Pages) CIRRUS

39 / 92 page

DS851F2

CS42L56

4.5.1

Power Control Options

The method by which the CS42L56 decides which set of rail voltages is supplied to the amplifier output

stages depends on the settings of the Adaptive Power bits (ADPTPWR) found in “Class H Control (Ad-

dress 08h)” section on page 63. As detailed in this section, there are four possible settings for these bits:

standard Class AB mode (settings 01 and 10), adapt to volume mode (setting 00) and adapt to signal (set-

ting 11).

4.5.1.1

Standard Class AB Mode (setting 01 and 10)

When the Adaptive Power bits are set to either 01 or 10, the rail voltages supplied to the amplifiers will be

held to ±VCP/2 or ±VCP, respectively. For these two settings, the rail voltages supplied to the output stag-

es are held constant, regardless of the signal level, internal volume settings, or the settings of the AIN and

DIN advisory volume registers. In either of these two settings, the amplifiers in the CS42L56 simply oper-

ate in a traditional Class AB configuration.

4.5.1.2

Adapt to Volume Mode (setting 00)

When the Adaptive Power bits are set to 00, the Class H controller decides which set of rail voltages to

send to the amplifiers based upon the gain and attenuation levels of all active internal processing blocks.

The active processing blocks are determined by the signal path configured; the configured path then dic-

tates which volume settings affect the controller. The paths available in the CS42L56 are (1) analog-in to

analog-out, (2) analog-in/digital-mix to analog-out and (3) digital-in to analog out.

Certain controls for the processing blocks in the signal path (such as B=A, mux, swap, mix and various

enables) do not directly affect the controller’s total volume sum. These controls do, however, have an in-

direct effect since they determine how the volume setting of the relevant processing block contributes to

the controller’s sum. These controls (italicized in Figure 21) determine whether or not the associated vol-

Referenced Control

ADPTPWR[1:0]................... “Adaptive Power Adjustment” on page 63

PGAAVOL [5:0]

PGAB=A

PDN_ADCx

ADCB=A

DIGSUM[1:0]

ADCxMUX[1:0]

Beep

Generator

AMIXxMUTE

AMIXxVOL [6:0]

BPVOL [4:0]

BASS[3:0]

TREB[3:0]

PLYBCKB=A

PDN_DSP

0 to -96dB

+12 to -51.5dB

ADCxMUTE

ADCxATT[7:0]

Mix/

Swap

ADCxSWAP[1:0]

PMIXxMUTE

PMIXxVOL[6:0]

+12 to -51.5dB

Mix/

Swap

PMIXxSWAP[1:0]

+6 to -50dB

TCEN

Bass/Treble

Boost/Cut

MSTxMUTE

MSTxVOL[7:0]

+12 to -102 dB

0 to -102dB

AINADV[7:0]

0 to -102dB

DINADV[7:0]

HPxVOL [6:0]

HPxMUTE

PDN_HPx[1:0]

HPDETECT (pin)

LINExVOL [6:0]

LINExMUTE

PDN_LINx[1:0]

HPDETECT (pin)

HPxMUX

LINExMUX

+12 to -6dB

+12 to -60dB

DAC

BEEP[1:0]

+12 to -10.5dB

PGA

LINE

Non-volume controls (italicized ) affect how the Class H

controller interprets the various volume settings.

0 or +20dB

BOOSTx

PDNMICx

+10 or +20dB

ADC

MICxBOOST

Figure 21. Class H Volume-Adapt Paths

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