CS4244 Datasheet, PDF (31/63 Pages) Cirrus Logic – 4 In/4 Out Audio CODEC with PCM and TDM Interfaces

4.6 Internal Signal Path
VD
2.5 VDC
VA
5.0 VDC
AIN1 (±)
AIN2 (±)
AIN3 (±)
AIN4 (±)
Multi-bit
 ADC
Digital Filters
2.5 V
LDO
Analog Supply
Channel Volume ,
Mute, Invert ,
Noise Gate
Master
Volume
Control
Interpolation
Filter
Multi-bit 
Modulators
DAC &
Analog
Filters
CS4244
AOUT1 (±)
AOUT2 (±)
AOUT3 (±)
AOUT4 (±)
Serial Audio Interface
Level Translator
Control Port
VL
1.8 to 5.0 VDC
SDOUT1 SDOUT2
SDIN2 SDIN1
Frame Sync Master Clock In Serial Clock
Clock / LRCK
In/ Out
Figure 19. Audio Path Routing
INT RST
I²C Control
Data
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 Figure 20. To enable the
sidechain feature, the “SDO CHAIN” bit in the "SP Control" register must be set.
DS900F2
31