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參數(shù)資料
| 型號： | MAX4028EUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps |
| 中文描述： | TRIPLE 1-CHANNEL, VIDEO MULTIPLEXER, PDSO16 |
| 封裝： | 4.40 MM, MO-153, TSSOP-16 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大小： | 317K |
| 代理商： | MAX4028EUE |
M
Therefore, a 6k
resistor will produce a 1.13V key-
clamp voltage as shown in
Figure 2. The clamp voltage
(V
CLAMP
) is measured at the output; the voltage at the
input is V
CLAMP
(sync tip or key clamp) divided by the
gain (+2V/V) + V
BE
.
In order for these clamps (sync tip or key) to work proper-
ly, the input must be coupled with a 0.1μF capacitor (typ)
with low leakage (<1μA to 2μA, max). Without proper cou-
pling, the clamp voltage will change during the horizontal
line time causing the
“
black level
”
to vary, changing the
image brightness from left to right on the display. In addi-
tion to the capacitor, a low resistance (
≤
75
) is required
on the source side to return the capacitor to ground. The
clamps used here are active devices with the coupling
capacitor serving two functions; first, as a charge reser-
voir to maintain the clamp voltage, and second, as the
compensation capacitor for the clamp itself. If an input is
not used, it must be terminated to avoid causing oscilla-
tions that could couple with another input.
In general, a sync-tip clamp is used for composite video
(Cvbs), gamma corrected primaries (R
’
G
’
B
’
), and the
luma signal (Y) in S-video. A key clamp is preferred for
component color difference signals (Pb and Pr), linear
primaries (RGB in PCs), and chroma (C) in S-video. The
rule is to sync tip clamp a signal if sync is present and
key clamp all others. Several examples are given in the
Clamp/Key-Clamp Settings for Video Formats
section.
Clamp/Key-Clamp Settings for Video Formats
Tables 1 and 2 provide the clamp settings on the
MAX4028/MAX4029 to interface with various video formats.
Low-Power, High-Impedance Disable Mode
All parts feature a low-power, high-impedance disable
mode that is activated by driving the
DISABLE
input
low. Placing the amplifier in disable mode reduces the
quiescent supply current and places the output imped-
ance at 2k
typically. Multiple devices can be paral-
leled to construct larger switch matrices by connecting
the outputs of several devices together and disabling
all but one of the paralleled amplifiers
’
outputs.
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
8
_______________________________________________________________________________________
KEY-CLAMP REFERENCE VOLTAGE
vs. R
KEYREF
M
R
KEYREF
(k
)
K
11
9
7
5
3
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
1
13
Figure 2. Key-Clamp Reference Voltage vs. R
KEYREF
Table 1. MAX4028 Clamp Settings for Video Formats
INPUT
1
2
3
FORMAT
Cvbs1
Cvbs2
Cvbs3
CLAMP/KEY
Clamp
Clamp
Clamp
INPUT
1
2
3
FORMAT
G
’
B
’
R
’
CLAMP/KEY
Clamp
Clamp
Clamp
R, G, B have sync on all.
INPUT
1
2
3
FORMAT
Gs
B
R
CLAMP/KEY
Clamp
Key
Key
Gs, B, R have sync only on Green.
INPUT
1
2
3
FORMAT
Y
C
Cvbs
CLAMP/KEY
Clamp
Key
Clamp
INPUT
1
2
3
FORMAT
Y
Pb
Pr
CLAMP/KEY
Clamp
Key
Key
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4028EWE | Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps |
| MAX4029EWP | Triple/Quad, 2:1 Video Multiplexer-Amplifiers with Input Clamps |
| MAX4032 | SMD 22V 50A ZNR SUR ASORB TR |
| MAX4032EUT-T | 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current |
| MAX4032EXT-T | 5V, 6dB Video Buffer with Sync-Tip Clamp, Output Sag Correction, and 150nA Shutdown Current |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4028EUE+ | 功能描述:視頻放大器 Triple & Quad 2:1 Video MUX-Amplifier RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX4028EUE+T | 功能描述:視頻放大器 Triple & Quad 2:1 Video MUX-Amplifier RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX4028EUE-T | 功能描述:視頻放大器 RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX4028EWE | 功能描述:視頻放大器 RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX4028EWE+ | 功能描述:視頻放大器 Triple & Quad 2:1 Video MUX-Amplifier RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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