Figure 26. Dac1-4 Path - Cirrus Logic CDB4244 Manual

4.6.3 DAC1-4 Path
AIN1 (±)
AIN2 (±)
AIN3 (±)
AIN4 (±)
VL
1.8 to 5.0 VDC
The AOUT1-4 signals are driven by the data placed into the DAC1-4 path. This data can be placed into
the DAC1-4 path via the
source to be selected from any of the up to 32 slots of data on the incoming TDM streams on SDIN1 and
SDIN2.
The DAC1-4 path also includes individual channel mutes. Separate volume controls are available for each
channel, along with a master volume control that simultaneously attenuates all four channels. The master
volume attenuation is added to any channel attenuation that is applied.
4.6.3.1 De-emphasis Filter
The CS4244 includes on-chip digital de-emphasis for 32, 44.1, and 48 kHz sample rates. It is not support-
ed for 96 kHz or for any settings in Double-speed Mode. The filter response is adjusted to be appropriate
for a particular base rate by the
if these bits are not set appropriately for the given base rate. The frequency response of the de-emphasis
curve scales proportionally with changes in sample rate, F
phasis for de-emphasis control.
The de-emphasis feature is included to accommodate audio recordings that utilize 50/15 s pre-emphasis
equalization as a means of noise reduction.
DS900PP2
2.5 V
Multi-bit
 ADC
Channel Volume ,
Mute, Invert ,
Digital Filters
Noise Gate
Serial Audio Interface
SDOUT1 SDOUT2 SDIN2 SDIN1

Figure 26. DAC1-4 Path

DAC1-4 Data Source
Base Rate Advisory
VD VA
2.5 VDC 5.0 VDC
LDO Analog Supply
Master
Volume
Interpolation
Control
Filter
Level Translator
Frame Sync Serial Clock
Master Clock In
Clock / LRCK In/Out
settings in the control port. These settings allow the input
bits. This filter response, shown in
. Please see
S
CS4244
AOUT1 (±)
AOUT2 (±)
DAC &
AOUT3 (±)
Multi-bit 
Analog
AOUT4 (±)
Modulators
Filters
Control Port
2
INT I C Control
RST
Data
Figure 27, will vary
Section 6.9.2 DAC1-4 De-em-
37