Motorola DSP56156 Manual page 142

ON-CHIP CODEC FREQUENCY RESPONSE AND GAIN ANALYSIS
20
L
o
g
0
M
a
-20
g
n
i
-40
t
u
d
-60
e
(
-80
d
B
)
-100
0.001
2
L
o
g
M
0
a
g
n
i
-2
t
u
d
e
-4
(
d
B
)
-6
0.001
Figure 6-13 Log Magnitude Frequency Response of the
MOTOROLA
2 4 6
0.5 1 1.5
D/A Section for F=2.048 MHz and D=128
DSP56156 ON-CHIP SIGMA/DELTA CODEC
8 10
Frequency (KHz)
(a)
2 2.5
Frequency (KHz)
(b)
Cascade of:
diff2-128.Filter
sum2-128.Filter
analogsum3-128.Filter
analogdiff3-128.Filter
analog-lp.Filter
12 14 16
Cascade of:
diff2-128.Filter
sum2-128.Filter
analogsum3-128.Filter
analogdiff3-128.Filter
analog-lp.Filter
3 3.5 4
6 - 27