CS43L22 datasheet(42/66 Pages) CIRRUS

42 / 66 page

DS792F2

CS43L22

Confidential Draft

3/4/10

7.7

Passthrough x Select: PassA (Address 08h), PassB (Address 09h)

7.7.1

Passthrough Input Channel Mapping

Selects one or sums/mixes the analog input signal into the passthrough Amplifier. Each bit of the

PASSx_SEL[4:1] word corresponds to individual channels (i.e. PASSx_SEL1 selects AIN1x,

PASSx_SEL2 selects AIN2x, etc.).

7.8

Analog ZC and SR Settings (Address 0Ah)

7.8.1

Ch. x Analog Soft Ramp

Configures an incremental volume ramp from the current level to the new level at the specified rate.

7.8.2

Ch. x 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).

7.9

Passthrough Gang Control (Address 0Ch)

7.9.1

Passthrough Channel B=A Gang Control

Configures independent or ganged control of the passthrough channel settings. Mute is not affected.

210

Reserved

PASSASEL4

PASSASEL3

PASSASEL2

PASSASEL1

PASSxSEL[4:1]

Selected Input to Passthrough Channel x

00000

No inputs selected

00001

AIN1x

00010

AIN2x

00100

AIN3x

01000

AIN4x

Application:

“Analog Passthrough” on page 24

Note: Table does not show all possible combinations.

543

Reserved

ANLGSFTB

ANLGZCB

ANLGSFTA

ANLGZCA

ANLGSFTx

Volume Changes

Affected Analog Volume Controls

Do not occur with a soft ramp

PASSxVOL[7:0] (“Passthrough x Volume” on page 46)

Occur with a soft ramp

Ramp Rate:

1/2 dB every 16 LRCK cycles

ANLGZCx

Volume Changes

Affected Analog Volume Controls

Do not occur on a zero cross-

ing

PASSxVOL[7:0] (“Passthrough x Volume” on page 46)

Occur on a zero crossing

543

PASSB=A

Reserved

PASSB=A

Single Volume Control

Disabled

Enabled

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