5 stand-alone operation, 1 serial port format selection, 2 de-emphasis control – Cirrus Logic CS4349 User Manual
Page 24: 3 popguard transient control, Section 5.1
24
DS782F2
CS4349
5 STAND-ALONE OPERATION
5.1
Serial Port Format Selection
The desired serial audio format is selected with the DIF2, DIF1 and DIF0 pins. For an explanation of the
required relationship between the LRCK, SCLK and SDIN, see
. For all formats, SDIN is valid
on the rising edge of SCLK. TDM Mode requires the selection of which stereo pair time “slot” is used to
output data as shown in
and
Note:
The group delay for TDM slot 0 channel B differs from the group delay of all other interface formats
and TDM slots/channels by one sample. Refer to the group delay specification in the combined in-
terpolation and on-chip analog filter response specifications table.
5.2
De-Emphasis Control
When pulled to VLC, the DEM pin activates the 44.1 kHz de-emphasis filter. When pulled to GND, the DEM
pin turns off the de-emphasis filter.
5.3
Popguard Transient Control
In Stand-Alone Mode, Popguard is selected by placing a 47 k
resistor between POPGUARD(TSTO) and
VLS. Popguard is defeated in Stand-Alone Mode by placing a 47 k
resistor between POPGUARD(TSTO)
and ground.
Table 13. Digital Interface Format - Stand-Alone Mode
DIF2 DIF1 DIF0
DESCRIPTION
FORMAT FIGURE
0
0
0
Left-Justified, up to 24-bit data
0
0
0
1
I²S, up to 24-bit data
1
0
1
0
Right-Justified, 16-bit data
2
0
1
1
Right-Justified, 24-bit data
3
1
0
0
TDM slot 0
4
1
0
1
TDM slot 1
5
1
1
0
TDM slot 2
6
1
1
1
TDM slot 3
7