CS4297A datasheet(11/52 Pages) CIRRUS

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CS4297A

data in its Slot 2. Write operations are similar, with

the register index in Slot 1 and the write data in Slot

2 of a SDATA_OUT frame. The function of each

input and output frame is detailed in Section 3,

AC Link Frame Definition. Individual register de-

scriptions are found in Section 4, Register Inter-

face.

2.3

Output Mixer

The CS4297A has two output mixers, illustrated in

Figure 8. The stereo output mixer sums together

the analog inputs to the CS4297A, including the

PC_BEEP and PHONE signals, according to the

settings in the volume control registers. The stereo

output mix is sent to the LINE_OUT and

ALT_LINE_OUT pins on the CS4297A. The

mono output mixer generates a monophonic sum of

the left and right channels from the stereo input

mixer. The mono output mix is sent to the

MONO_OUT output pin on the CS4297A.

2.4

Input Mux

The input multiplexer controls which analog input

is sent to the ADCs. The output of the input mux is

converted to stereo 18-bit digital PCM data and

sent to the controller by means of the AC-link

SDATA_IN signal.

2.5

Volume Control

The CS4297A volume registers control analog in-

put levels to the input mixer and analog output lev-

els, including the master volume level, and the

alternate volume level. The PC_BEEP volume con-

trol uses 3 dB steps with a range of 0 dB to -45 dB

attenuation. All other analog volume controls use

1.5 dB steps. The analog inputs have a mixing

range of +12 dB signal gain to -34.5 dB signal at-

tenuation. The analog output volume controls have

from 0 dB to -94.5 dB attenuation for LINE_OUT

and from 0 dB to -46.5 dB attenuation for

ALT_LINE_OUT and MONO_OUT.

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