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參數(shù)資料
| 型號(hào)： | MC44302AP |
| 廠商： | MOTOROLA INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | ADVANCED MULTI-STANDARD VIDEO/SOUND IF |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 612K |
| 代理商： | MC44302AP |
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MC44302A
18
MOTOROLA ANALOG IC DEVICE DATA
PIN FUNCTION DESCRIPTION
Pin No.
Equivalent Internal Circuit
Description
1
1
0.01
VCC
VCC
10 k
VCC
Volume
Control
DC Volume Control
A potentiometer of 20 k
or less, connected as shown, is used to
adjust the audio output level at Pin 27. There is no audio signal
present at this pin, allowing the use of unshielded wire between
the IF board and the potentiometer. To prevent hum and noise
pickup, a bypass capacitor connects from this pin to ground. Refer
to Figure 17.
2
2
From Ceramic Sound
IF Filter at Pin 28
VCC
2.2 k
VCC
Sound Input (FM)
Sound Input (FM)
This pin is the input of the FM IF. The intercarrier sound output at
Pin 28 connects to this input through a ceramic bandpass filter.
The FM detector is active in PAL 1, PAL 2, and NTSC modes.
Refer to Table 2.
3
15.5 k
From External
Audio Source
27 k
Audio Input/
Audio–Video
Switch
3
VCC
Audio 2
Video 1
Audio 1
Video 2
0.1
V
3.3 k
22 k
Audio Input/Audio–Video Switch
This is a multifunction input that selects the audio source that
appears at Pin 27, and the video polarity at Pins 5 and 6. Audio 1
is without a dc path from Pin 3 to ground. Internally demodulated
audio (AM of FM) appears at Pins 24 and 27, negative video at
Pin 5, and positive video at Pin 6. The audio source at Pin 3 is
internally disconnected. Audio 2 is with the 22 k
resistor
connected. Internally demodulated audio (AM or FM) appears at
Pin 24, negative video at Pin 5, positive video at Pin 6, and the
audio source at Pin 3 appears at Pin 27. Video 1 is with the 3.3 k
resistor connected. Internally demodulated audio (AM or FM)
appears at Pins 24 and 27, negative video at Pin 5, and positive
video at Pin 6. Video 2 is with Pin 3 grounded. Internally
demodulated audio (AM of FM) appears at Pins 24 and 27,
positive video at Pin 5, and negative video at Pin 6. Refer to
Table 1.
4
4
C4
0.0033
VCC
Sound De–Emphasis (FM)
VCC
18 k
200
μ
A
100
μ
A
Sound De–Emphasis (FM)
A capacitor is connected from this pin to ground. It is used in
conjunction with internal 18 k
resistor to set the FM sound
de–emphasis time constant. The typical de–emphasis time
constant required for a flat audio response is 75
μ
s in the United
States and 50
μ
s in Europe. The FM sound detector frequency
response for different de–emphasis capacitor values is shown in
Figure 12.
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