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参数资料
| 型号： | LA7955 |
| 元件分类： | 多路复用及模拟开关 |
| 英文描述： | DUAL 3-CHANNEL, AUDIO/VIDEO SWITCH, PDIP20 |
| 封装： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件页数： | 5/7页 |
| 文件大小： | 95K |
| 代理商： | LA7955 |
LA7955
No.2740-5/7
Circuit and Operational Description
1. Video Input circuit
The video input circuit shown in the figure on the right has an input impedance of approximately 20k
Ω. The input bias
voltage is determined by the bias at point (A), however, the voltage at this point fluctuates according to VCC.
VCC
A
bias
20k
Ω
200
Ω
pin 1,3,7
Signal
2. Audio input circuit
The audio input circuit is shown in the figure on the right. The impedance of audio inputs 1 and 2 (Pins 12, 13,18, and
19) is approximately 65k
Ω, and that of audio input 3 (Pins 14 and 17), approximately 71kΩ. Although the input bias
voltage is determined by the bias at point (B), the voltage at point (B) is supplied from a lownoise Zener diode voltage
regulator circuit and is not dependent on VCC.
VCC
R1
B
VCC
bias
200
Ω
pin 12,13,14
17,18,19
Signal
3. Control signal input circuit
The circuit at input pins for the switching and muting circuits are shown in the figure on the right. The threshold
voltage is approximately 1.4V.
20.2k
Ω
19.5k
Ω
pin 4,8,10
4. Video Output Circuit
The video output is emitter follower output.
VCC
20
Ω
R2
R1
Signal
Video output
pin 5,9
5. Audio output circuit
The audio output is emitter follower output.
VCC
30
Ω
R2
R1
Signal
Audio output
pin 11,15,16,20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LA7956 | 制造商:Panasonic Industrial Company 功能描述:IC |
| LA7957 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Video Switch for TV/VCR Use |
| LA7958 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:For TV, VTR Audio/Video Switch |
| LA7958_11 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Audio/Video Switch |
| LA7958N-E | 制造商:ON Semiconductor 功能描述:AV SW IC - Ammo Pack 制造商:ON Semiconductor 功能描述:FNFLD / AV SW IC |
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