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Table 4-1
Lowpass Filter Constants
(24dB/oct Butterworth characteristics)
fSAMP
Rl
R2
R3
R4
R5
(kHz)
(KO)
(KO)
(KO)
(KO)
(KO)
4
12
13
24
2.7
12
5
10
11
20
2.2
10
6
8.2
9.1
16
1.8
8.2
7
5.6
6.8
12
1.3
6.2
Cl
0.022
\IF
C2
0.0022
\IF
C3
0.022
\IF
C4
0.01
\IF
RL
1
KO
4.3 Power Amp
Because the signal obtained as the output of the lowpass
filter described in the preceding paragraph has a wave-
form identical to that of a normal analog signal, this
output can be input to any type of power amp as required.
Fig. 4-5 sh.ows an example of a power amp (\lPC1212C) with
a low operating voltage that can be used with the +5V
single power supply of the \lPD7755 /7756
FILTER
Ycc=5V
470l'F
Fig. 4-5
Power Amp (0.7H, 5V)
4-6
SP
.
4!l
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