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參數(shù)資料
| 型號： | AK4252VU |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | Output Coupling Capacitor-less Video Amp with LPF |
| 中文描述： | 輸出耦合電容器的視頻放大器的低通濾波器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 81K |
| 代理商： | AK4252VU |
ASAHI KASEI
[AK4250/52]
Rev.0.4
2006/11
- 5 -
Video Block
The Video Amp has a drivability for a load resistance of 150
Ω
. The AK4250/52 have a composite input and output and
includes a low pass filter (LPF). Internal negative power supply circuit supplies the negative voltage to the video amp and the
video amp 0V output is used for a pedestal level. Therefore, the output coupling capacitor can be removed.
VDD
Charge
Pump
CP
CN
VSS
VEE
1uF
1uF
Negative Power
AK4250/52
(+)
C2
C1
(+)
Note 6. C1 and C2 capacitors should have the low ESR (
Equivalent Series Resistance
) over all temperature range.
When these capacitors have the polarity, the positive polarity pin should be connected to the CP pin and the
VSS pin. Non polarity capacitors can also be used.
Figure 3. Negative Power Supply circuit
VOUT
75
Ω
AK4250/52
0V
75
Ω
Figure 4. Video signal output
Power Down Control
When the PDN pin is “L”, the AK4250/52 are forced to the Power Down Mode (Power consumption: typ 1
μ
A). VOUT pin
becomes Hi-Z at PDN pin = “L”. The AK4250/52 include a power-on-reset function. Therefore any reset isn’t required
externally.
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