CS43L22 datasheet(24/66 Pages) CIRRUS

24 / 66 page

DS792F2

CS43L22

Confidential Draft

3/4/10

4.3

Analog Passthrough

The CS43L22 accommodates analog routing of the analog input signal directly to the headphone amplifiers

by using the PASSTHRUx mux. This feature is useful in applications that utilize an FM tuner where audio

recovered over-the-air must be transmitted to the headphone amplifier directly. This analog passthrough

path reduces power consumption and is immune to modulator switching noise that could interfere with some

tuners.

Four analog input channels can be chosen or summed by using the PASSxSEL bits as shown in Figure 8

to provide input to the CS43L22 when in analog passthrough mode. A pair of passthrough amplifiers can be

used to mute and apply gain to the input signals.

Referenced Control

Analog Front End

PASSB=A ............................

ANLGSFTx ..........................

ANLGZCx ............................

PASSxSEL4,3,2,1 ................

PASSxMUTE .......................

PASSxVOL[7:0] ...................

PASSTHRUx........................

“Passthrough Channel B=A Gang Control” on page 42

“Ch. x Analog Soft Ramp” on page 42

“Ch. x Analog Zero Cross” on page 42

“Passthrough Input Channel Mapping” on page 42

“Passthrough Mute” on page 44

“Passthrough x Volume” on page 46

“Passthrough Analog” on page 44

AIN4B

AIN1B

AIN2B

AIN3B

ANALOG PASS

THRU TO

HEADPHONE

AMPLIFIER MUX

AIN4A

AIN1A

AIN2A

AIN3A

Analog Passthru

Amplifiers

ANLGSFTB

ANLGGZCB

PASSB=A

PASSBMUTE

PASSBVOL[7:0]

+12dB/-60dB

0.5 dB steps

ANLGSFTA

ANLGGZCA

PASSB=A

PASSAMUTE

PASSAVOL[7:0]

+12dB/-60dB

0.5 dB steps

PASSASEL[4:1]

PASSBSEL[4:1]

DAC A

Output

DAC B

Output

PASSTHRUA

PASSTHRUB

Figure 8. Analog Passthrough Signal Flow

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