CS4297 Datasheet, PDF (41/46 Pages) Cirrus Logic – CrystalClear SoundFusion Audio Codec 97

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 V_RMS
(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
1 V_RMS (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 V_RMS
(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 V_RMS (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 V_RMS
(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.
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