4 de-emphasis, Table 6.de-emphasis control, Cs4340 – Cirrus Logic CS4340 User Manual
Page 18: Disabled 0 disabled, 48 khz, 32 khz table 6. de-emphasis control, Figure 19. de-emphasis curve
CS4340
18
DS297F3
4.4
De-Emphasis
The device includes on-chip digital de-emphasis. Figure 19 shows the de-emphasis curve for Fs equal to 44.1 kHz.
The frequency response of the de-emphasis curve will scale proportionally with changes in sample rate, Fs.
Pin 8 is available for de-emphasis control and selects the 44.1 kHz de-emphasis filter. If the Internal Serial Clock is
used, pin 3 is also available for additional de-emphasis control and, in combination with pin 8, selects either the 32,
44.1, or 48 kHz de-emphasis filter. Please see Table 6 for the desired de-emphasis control.
LRCK
SCLK
Left C hannel
SDIN
6
5
4
3
2
1
0
7
23 22 21 20 19 18
6
5
4
3
2
1
0
7
23 22 21 20 19 18
32 clo cks
0
R ight Cha nnel
Figure 17. CS4340 Format 2 - Right Justified, 24-Bit Data
LRCK
SCLK
Left C hannel
R ight Cha nnel
SDIN
6
5
4
3
2
1
0
9
8
7
15 14 13 12 11 10
6
5
4
3
2
1
0
9
8
7
15 14 13 12 11 10
32 clo cks
Figure 18. CS4340 Format 3 - Right Justified, 16-Bit Data
Internal SCLK
External SCLK
DEM1
DEM0 Description
DEM0 Description
0
0
Disabled
0
Disabled
0
1
44.1 kHz
1
44.1 kHz
1
0
48 kHz
1
1
32 kHz
Table 6. De-Emphasis Control
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1
F2
3.183 kHz
10.61 kHz
Figure 19. De-Emphasis Curve