Internal Signal Path; Figure 19. Audio Path Routing - Cirrus Logic CDB4244 Manual

4.6

Internal Signal Path

AIN1 (±)
AIN2 (±)
AIN3 (±)
Multi-bit
AIN4 (±)
 ADC
Digital Filters
SDOUT1
VL
1.8 to 5.0 VDC
The CS4244 device includes two paths in which audio data can be routed. The analog input path, shown in
yellow, allows up to four analog signals to be combined into a single TDM stream on the SDOUT1 pin or
output as stereo pairs on the SDOUT1 and SDOUT2 pins. The DAC1-4 path, highlighted in blue, converts
serial audio data to analog audio data.
4.6.1 Routing the Serial Data within the Signal Paths
4.6.1.1 ADC Signal Routing
In TDM mode, the CS4244 is designed to load the first four slots of the TDM stream on the SDOUT1 pin
with the internal ADC data. Additionally, in order to minimize the number of SDOUT lines that must be run
to the system controller in a multiple IC application, the SDOUT data for up to 4 devices can be loaded
into a single TDM stream by side chaining the devices together, as shown in
sidechain feature, the
DS900PP2
VD
2.5 VDC
2.5 V
Master
Volume
Channel Volume ,
Control
Mute, Invert ,
Noise Gate
Serial Audio Interface
Frame Sync
SDOUT2 SDIN2 SDIN1
Clock / LRCK

Figure 19. Audio Path Routing

"SDO CHAIN" bit in the "SP Control" register
VA
5.0 VDC
LDO Analog Supply
Multi-bit 
Interpolation
Filter Modulators
Level Translator
Serial Clock
Master Clock In
In/ Out
must be set.
CS4244
AOUT1 (±)
AOUT2 (±)
DAC &
AOUT3 (±)
Analog
AOUT4 (±)
Filters
Control Port
2
INT I C Control
RST
Data
Figure 20. To enable the
31