CS4294SLASHCS4298 datasheet(71/81 Pages) CIRRUS

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CS4205

DS489PP4

Audio I/O Pins

PC_BEEP - Analog Mono Source, Input, Pin 12

The PC_BEEP input is intended to allow the PC system POST (Power On Self-Test) tones to pass

through to the audio subsystem. The PC_BEEP input has two connections: the first connection is to the

analog output mixer, the second connection is directly to the LINE_OUT stereo outputs. While the

RESET# pin is actively being asserted to the CS4205, the PC_BEEP bypass path to the LINE_OUT

outputs is enabled. While the CS4205 is in normal operation mode with RESET# de-asserted,

PC_BEEP is a monophonic source to the analog output mixer. 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 connected to the Vrefout pin or AC-coupled to

analog ground.

PHONE - Analog Mono Source, Input, Pin 13

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

subsystem input to the audio subsystem. 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 connected to the Vrefout pin or AC-coupled to analog ground.

MIC1 - Analog Mono Source, Input, Pin 21

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

desktop microphone connection to the audio subsystem. The CS4205 internal mixer's microphone input

is MUX selectable with either MIC1 or MIC2 as the input. 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 connected to the Vrefout pin or AC-coupled to

analog ground.

MIC2 - Analog Mono Source, Input, Pin 22

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. The CS4205 internal mixer's microphone input

is MUX selectable with either MIC1 or MIC2 as the input. 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 connected to the Vrefout pin or AC-coupled to

analog ground.

LINE_IN_L, LINE_IN_R - Analog Line Source, Inputs, Pins 23 and 24

These inputs form a stereo input pair to the CS4205. The maximum allowable input is 1 VRMS

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

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

AC-coupled to analog ground.

CD_L, CD_R - Analog CD Source, Inputs, Pins 18 and 20

These inputs form a stereo input pair to the CS4205. It is intended to be used for the Red Book 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 and require AC-coupling to external circuitry.

If these inputs are not used, they should both be connected to the Vrefout pin or AC-coupled to analog

ground.

CD_GND - Analog CD Common Source, Input, Pin 19

This analog input is used to remove common mode noise from Red Book 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.

CS4294/CS4298 数据表(PDF) 71 Page - Cirrus Logic

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