5 de-emphasis, Figure 6. de-emphasis curve, Table 6. de-emphasis control – Cirrus Logic CS4340A User Manual
Page 8: Cs4340a
CS4340A
8
DS590F2
3.5
De-Emphasis
The device includes on-chip digital de-emphasis. Figure 6 shows the de-emphasis curve for F
s
equal to
44.1 kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sam-
ple rate, F
s
. Please see Table 6 for the desired de-emphasis control.
LR C K
S C L K
Left C ha nne l
R ig h t C ha n nel
SDIN
+3 +2 +1
+5 +4
M SB
-1 -2 -3 -4 -5
+3 +2 +1
+5 +4
-1 -2 -3 -4
LSB
M SB
LSB
Figure 3. CS4340A Format 1 - Left Justified up to 24-Bit Data
LRCK
SCLK
L e ft C h a n ne l
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
3 2 c lo cks
0
R ig h t C h a n ne l
Figure 4. CS4340A Format 2 - Right Justified, 24-Bit Data
LRCK
SCLK
Le ft C ha nne l
R ig ht C ha nne l
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
3 2 c lo cks
Figure 5. CS4340A Format 3 - Right Justified, 16-Bit Data
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1
F2
3.183 kHz
10.61 kHz
Figure 6. De-Emphasis Curve
Table 6. De-Emphasis Control
DEM
DESCRIPTION
0
Disabled
1
44.1 kHz