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參數(shù)資料
| 型號(hào)： | LA7577N |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Super-Split，PLL-II VIF and SIF IF Signal Processor for TV/VCRs(用于電視機(jī)/VCR應(yīng)用的IF信號(hào)處理（鎖相環(huán)II VIF+SIF）電路) |
| 中文描述： | 超斯普利特，鎖相環(huán)-Ⅱ資料表格及SIF中頻信號(hào)處理器的電視/錄像機(jī)（用于電視機(jī)/錄像機(jī)應(yīng)用的中頻信號(hào)處理（鎖相環(huán)二資料表格強(qiáng)度因子）電路） |
| 文件頁(yè)數(shù)： | 9/16頁(yè) |
| 文件大?。?/td> | 439K |
| 代理商： | LA7577N |
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LA7577N
No. 4037—9/16
FM Discriminator (Pin 2)
The quadrature detector frequency at which the 90
°
phase
shift occurs is determined by the tuned circuit connected
to pin 2 as shown in Figure 7.
The detector bandwidth characteristics are determined
largely by the coil Q and damping resistance. The damp-
ing resistor should be chosen for the desired output level
and bandwidth characteristics.
FM muting is achieved by holding point A, in Figure 7, at
≤
1V DC.
IF AGC (Pins 3 and 13)
The IF signal is peak detected and averaged by the filters
connected to pins 13 and 3, which are the 1st AGC and
2nd AGC, respectively, as shown in Figure 8. The IF AGC
audio component of the input signal to the video IF stage
is first removed by an audio trap.
Figure 7. FM discriminator
Figure 8. IF AGC circuits
Typical AGC filter time constants
Mute switch (IS-15 switch)
The black-noise canceler can be disabled by pulling pin 13
to 1V or lower. An external AGC source can then be
applied to pin 3 to drive the AGC circuit. This mode of
operation is designed for use with an IS-15 (EIA standard)
switch.
Ghosting problems
Reflected signals which have a phase different from that of
the main signal can cause distortion of the horizontal sync
pulse, as shown in Figure 9. As a result, the same charge-
to-discharge current ratio of the IF AGC cannot be main-
tained. If the phase difference is large, the video signal can
also be distorted as shown in Figure 10. Distortion can be
minimized by connecting a 820k
to 1M
resistor
between pin 13 and ground.
Pin
Component
Single time
constant
Double time constant
3
C1
330pF
330pF
330pF
R1
–
2.2k
1.8k
C2
–
0.47
μ
F
0.1
μ
F
13
C3
0.47
μ
F
0.068
μ
F
0.047
μ
F
R2
820k
820k
820k
Figure 9. Horizontal sync pulse distortion
Figure 10. Video signal distortion
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| LA7578 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA7578N | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal Processing (Super PLL-II VIF + SIF) Circuit for TVs and VCRs |
| LA7583 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal Processing Circuit (A2C PLL VIF + SIF) for TVs and VCRs |
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