Motorola DSP56156 Manual page 131

ON-CHIP CODEC FREQUENCY RESPONSE AND GAIN ANALYSIS
20
L
o
0
g
M
a
-20
g
n
i
-40
t
u
d
e -60
(
d
-80
B
)
-100
0.001
5
L
o
g
0
M
a
g
-5
n
i
t
u
-10
d
e
(
-15
d
B
)
-20
0.001
Figure 6-6 IIR Decimation and A/D Section Log Magnitude
Frequency Response for F=2.048 MHz and D=128
6 - 16
1 2 3
Frequency (KHz)
0.5 1 1.5
Frequency (KHz)
DSP56156 ON-CHIP SIGMA/DELTA CODEC
IIR Decimation Filter Response
A/D Comb Filter Response
A/D Final Filter Response
4 5
IIR Decimation Filter Response
A/D Comb Filter Response
A/D Final Filter Response
2 2.5
6 7 8
3 3.5 4
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