CS4205 Datasheet, PDF (16/80 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with Portable Computing

CS4205
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.
front
ch
SRC
surr
ch
DACS
DAC
c+lfe
ch
L/R
cap
SRC
mic
cap
½ SRC
CAPS
MICS
I²S
IN1
VOL
I²S
IN2
VOL
I²S
IN3
VOL
MIXER
mux out mic out
ADC
½ ADC
VOL VOL
Σ
DIG
EFX
ZV
ASRC
VOL
Signal Processing Engine
Figure 9. Digital Signal Path Overview
DDM
Σ
LINE_OUT
MONO_OUT
VOL
SDOS
VOL
I²S
OUT1
I²S
OUT2
SPDS
S/PDIF
OUT
16
DS489PP2