CS4297 datasheet(40/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

SDATA_OUT - AC-link Serial Data Input Stream to AC’97, Input

This input signal transmits the control information and digital audio output streams to be sent

to the DACs. The data is clocked into the CS4297 on the falling edge of BIT_CLK. A series

terminating resistor of 47

Ω should be connected on this signal close to the device driving the

input.

SDATA_IN - AC-link Serial Data Output Stream from AC’97, Output

This output signal transmits the status information and digital audio input streams from the

ADCs. The data is clocked out of the CS4297 on the rising edge of BIT_CLK.

(See the

Digital Hardware Description section). A series terminating resistor of 47

Ω should be

connected on this signal as close to the CS4297 as possible.

XTL_IN - Crystal Input

This pin accepts either a crystal, with the other pin attached to XTL_OUT, or an external

CMOS clock. XTL_IN must have a crystal or clock source attached for proper operation. The

crystal frequency must be 24.576 MHz and designed for fundamental mode, parallel resonance

operation.

XTL_OUT - Crystal Output

This pin is used for a crystal placed between this pin and XLT_IN. If an external clock is used

on XTL_IN, this pin must be left floating with no traces or components connected to it.

Analog I/O Pins

PC_BEEP - Analog Mono Source, Input

This signal is intended to be used as an internal PC BEEP connection to the audio subsystem.

This source is NOT input to the Stereo-to-Mono mixer. The maximum allowable input is

1VRMS (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

This signal is intended to be used as a Voice Modem connection to the audio subsystem. This

source is NOT input to the Stereo-to-Mono 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.

MIC1 - Analog Mono Source, Input

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

a desktop microphone connection to the audio subsystem. This input is MUX selectable to the

input mixer with the MIC2 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.

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