CS4297 datasheet(41/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

MIC2 - Analog Mono Source, Input

This analog input is a monophonic source to the analog output mixer. It is intended to be used

as an alternate microphone connection to the audio subsystem. This input is MUX selectable to

the input mixer with the MIC1 input source. The maximum allowable input is 1 VRMS

(sinusoidal). This input is internally biased at the Vrefout voltage reference and requires AC

coupling to external circuitry. If this input is not used, it should be AC coupled to Analog

ground.

LINE_IN_L and LINE_IN_R- Analog Line Source, Inputs

These inputs form a stereo input pair to the CS4297. The maximum allowable input is

1VRMS (sinusoidal). These inputs are internally biased at the Vrefout voltage reference. AC

coupling to external circuitry is required. If these inputs are not used, they should both be

connected to the Vrefout pin or both AC coupled, with separate AC coupling caps, to Analog

ground.

CD_L and CD_R - Analog CD Source, Inputs

These inputs form a stereo input pair to the CS4297. It is intended to be used for the Redbook

CD audio connection to the audio subsystem. The maximum allowable input is 1 VRMS

(sinusoidal). These inputs are internally biased at the Vrefout voltage reference. AC coupling to

external circuitry is required. If these inputs are not used, they should both be connected to the

Vrefout pin or both AC coupled, with separate AC coupling caps, to Analog ground.

CD_GND - Analog CD Common Source, Input

This analog input is used to remove common mode noise from Redbook CD audio signals. The

impedance on the input signal path should be one half the impedance on the CD_L and CD_R

input paths. This pin requires AC coupling to external circuitry. If this input is not used, it

should be connected to the Vrefout pin or AC coupled to Analog ground.

VIDEO_L and VIDEO_R - Analog Video Audio Source, Inputs

These inputs form a stereo input pair to the CS4297. It is intended to be used for the audio

signal output of a video device. The maximum allowable input is 1 VRMS (sinusoidal). These

inputs are internally biased at the Vrefout voltage reference. AC coupling to external circuitry

is required. If these inputs are not used, they should both be connected to the Vrefout pin or

both AC coupled, with separate AC coupling caps, to Analog ground.

AUX_L and AUX_R - Analog Auxiliary Source, Inputs

These inputs form a stereo input pair to the CS4297. The maximum allowable input is 1 VRMS

(sinusoidal). These inputs are internally biased at the Vrefout voltage reference. AC coupling to

external circuitry is required. If these inputs are not used, they should both be connected to the

Vrefout pin or both AC coupled, with separate AC coupling caps, to Analog ground.

CS4297 데이터시트(PDF) 41 Page - Cirrus Logic