參數(shù)資料
型號(hào): FX118P3
英文描述: Analog Miscellaneous
中文描述: 模擬雜項(xiàng)
文件頁(yè)數(shù): 4/7頁(yè)
文件大小: 114K
代理商: FX118P3
4
0.1
0.2
0.3
0.5
2.0
1.0
7.0
Frequency kHz
3.0
-40
-30
-20
-10
-3
0
+5
Gain
dB
Audio Input Level = 275mVrms
V = 3.75V
Fig.4 Typical Audio Frequency Response of a Single Scrambled or De-scrambled Channel
0
Lowpass Filtered Voiceband
for Input to
Balanced Modulator
1000Hz
2000Hz
3000Hz
0
Carrier Frequency (3300Hz)
Generated On-Chip for Input to
Balanced Modulator
1000
2000
3000
0
Bandpass Filtered Voiceband
Presented at the Ouput
after Mixing with the Carrier Frequency
in the Balanced Modulator
1000
2000
3000
Speech Band
Input Voiceband Frequencies
3300
A
B
C
D
A
B
C
D
(1)
(2)
(3)
(4)
How the Inverter Works
Carrier Frequency minus Input Voice Frequency equals Scrambled Voice Frequency
System Gains
When calculating the external components for the operation of the FX118 the following points should be considered:
(a)
The Input Lowpass Filter has a (typical) gain of 0.5dB.
(b)
The Balanced Modulator has a (typical) attenuation of 4.0dB.
(c)
The Output Bandpass Filter has a (typical) gain of 4.5dB.
Application Information ......
Fig.5 A Pictorial Explanation of the FX118 “Scramble Operation”
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