參數(shù)資料
型號(hào)： AK4254VF
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： Capacitor-less Video Amp with 7:2 Video Switch
中文描述： 電容器的視頻放大器以7:2視頻開(kāi)關(guān)
文件頁(yè)數(shù)： 12/22頁(yè)
文件大?。?/td> 341K
代理商： AK4254VF
ASAHI KASEI
[AK4254]
MS0586-E-01
2007/08
- 12 -
SEL22 bit
0
0
0
0
1
1
1
1
Note: 16. When the input setting is “Off”, VOUT2 output is “GND”.
Table 8. Input Selector 2 (Serial Control Mode)
SEL21 bit
0
0
1
1
0
0
1
1
SEL20 bit
0
1
0
1
0
1
0
1
VOUT2 pin
Off Note: 16)
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
(default)
■
Video Block
The Video Amp has drivability for a load resistance of 150
Ω
. The AK4254 has composite input and output with 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.
The negative power supply circuit needs capacitors of Ca and Cb with 1.0
μ
, which should have the low ESR (Equivalent
Series Resistance). When those capacitors have the polarity, each positive polarity pins should be connected to CP and
VSS side.
The negative power supply circuit generates the negative voltage to use the clock that corresponds to the input video
signal. When there is no video input signal and the negative voltage is insufficient (CVEE > -0.8V) in case of low quality
input signal (Note: 17), the negative power supply circuit generates the negative voltage by using the internal oscillator
circuit. The VOUT outputs –0.6V(typ) when there is no video signal input.
Note: 17. Low quality video signal has the following characteristics.
Input Sync Tip Level= -0.43V~ -0.14V (from the pedestal voltage)
Horizontal Line Sync Pulse=4.0
μ
s
～
5.4
μ
s, Equalizing Pulse=2.0
μ
s
～
2.7
μ
s, Serration Pulse=4.0
μ
s
～
5.4
μ
s
CVDD1
Charge
Pump
CP1
CN1
CVSS1
CVEE1
1uF
1uF
Negative Power
AK4254
(+)
Cb
Ca
(+)
Figure 3.
Negative Power Supply Circuit
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