CS4297 datasheet(16/81 Pages) CIRRUS

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CS4205

DS489PP4

3. DIGITAL SIGNAL PATHS

The CS4205 includes a number of internal digital

signal path options. Figure 9 shows the principal

signal flow options through one channel of the de-

vice. Four commonly used signal flow modes are

detailed in the following sections. The signal flow

modes are controlled through the bits in the AC

Mode Control Register (Index 5Eh). The bit config-

uration for each detailed mode is listed in Table 1

on page 17.

3.1

Analog Centric Mode

Analog centric mode is detailed in Figure 10 on

page 18. In this mode, all the digital sources are

pre-mixed in the digital mixer and sent to the

DACs. The DAC outputs are mixed with the analog

sources in the analog mixer. The ADCs send cap-

tured data directly to the host. The ADC mux is

used to select a single source or the output of the in-

put mixer for capture. In the analog centric mode,

effects processing is only available on digital

sources.

Signal Processing Engine

SRC

DAC

LINE_OUT

MONO_OUT

ADC

½ ADC

SRC

½ SRC

I²S

IN1

I²S

IN2

I²S

IN3

ASRC

VOL

DIG

EFX

I²S

OUT1

S/PDIF

OUT

I²S

OUT2

VOL

DACS

CAPS

MICS

DDM

SDOS

SPDS

front

L/R

cap

mic

cap

surr

c+lfe

MIXER

mux out

mic out

Figure 9. Digital Signal Path Overview

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