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視頻開關(guān)
文件頁(yè)數(shù)： 19/22頁(yè)
文件大?。?/td> 341K
代理商： AK4254VF
ASAHI KASEI
[AK4254]
MS0586-E-01
2007/08
- 19 -
CP1
2
CN1
3
CVSS1
4
CVEE1
5
VOUT1
6
AVDD
7
AVSS
8
TEST
9
P/S
10
VIN1
11
VIN2
12
VIN3
13
CP2
29
CN2
28
CVSS2
27
CVEE2
26
VOUT2
25
PDN
24
I2C
23
SDA
22
SCL
21
CSN
20
CAD1
19
CAD0
18
AK4254
14
15
17
16
VIN4
VIN5
VIN7
VIN6
CVDD1
1
CVDD2
30
1u
+
+
+
0.1u
10u
Power Supply 3V
1u
+
1u
+
1u
75
75
DSP or
μ
P
0.1u
0.1u
0.1u
0.1u
0.1u
0.1u
0.1u
Video in
Video in
Video out
Video out
Figure 17. Typical Connection Diagram (Serial Control Mode: I
2
C Bus mode)
1.
Grounding and Power Supply Decoupling
The AK4254 requires careful attention to power supply and grounding arrangements. AVDD, CVDD1 and CVDD2 are
usually supplied from the system’s analog supply. AVSS, CVSS1 and CVSS2 of the AK4254 should be connected to the
analog ground plane. System analog ground and digital ground should be connected together near to where the supplies
are brought onto the printed circuit board. Decoupling capacitors should be as near to the AK4254 as possible, with the
small value ceramic capacitor being the nearest.
2. Analog Inputs
Usually the input signal is AC coupled using 0.1uF capacitor (Figure 15, Figure 16, Figure 17).
3. The notes for drawing the board
Analog input and output pins should be as short as possible in order to avoid unwanted coupling into the AK4254. The
unused pins should be open.
4. Video Output
The AK4254 are on-chip 2ch video amp for drive 150
Ω
resistance. The gain of each amp is +6dB (typ) (Figure 1).
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