¡ Semiconductor
MSM7532
TVI, TVIO
Pins used to constitute an RC-active filter on the transmit input side.
If input signals have frequency components over 50 kHz, these components are output as aliasing
noises from the built-in SCF circuit. In order to remove these noises, insert the first or second order
RC-active filter with about 10 kHz cut-off frequency, as shown below.
<Second order RC-active filter configuration>
CMPI
C5
R9
R11
C7
TVI
C6
R10
SGO
–
+
C4
TVIO
Compressor
VTVI
C4, C5 for DC cutoff
In the case of fc = 10 kHz, gain : 0 dB
R9 = R10 = R11 = 68 kW
C5 = 0.22
mF,
C6 = 510 pF, C7 = 110 pF
<First order RC-active filter configuration>
CMPI
C5
R32
C26
R33
TVI
–
+
VTVI
C4
TVIO
Compressor
In the case of fc = 10 kHz, gain : 0 dB
R32 = R33 = 51 kW
C5 = 0.22
mF,
C26 = 300 pF
5/21
OKI [ OKI ELECTRONIC COMPONETS ]
