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參數(shù)資料
| 型號： | MAX4029EWP+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP VIDEO MUX 2:1 20-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 36 |
| 應(yīng)用： | 2:1 多路復(fù)用器-放大器 |
| 電路數(shù)： | 4 |
| -3db帶寬： | 210MHz |
| 轉(zhuǎn)換速率： | 300 V/µs |
| 電流 - 電源： | 38mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 包裝： | 管件 |
MAX4028/MAX4029
Therefore, a 6k
resistor will produce a 1.13V key-
clamp voltage as shown in Figure 2. The clamp voltage
(VCLAMP) is measured at the output; the voltage at the
input is VCLAMP (sync tip or key clamp) divided by the
gain (+2V/V) + VBE.
In order for these clamps (sync tip or key) to work proper-
ly, the input must be coupled with a 0.1F capacitor (typ)
with low leakage (<1A to 2A, 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. RKEYREF
MAX4028
fig02
RKEYREF (k
)
KEY-CLAMP
REFERENCE
VOLTAGE
(V)
11
9
7
5
3
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
113
Figure 2. Key-Clamp Reference Voltage vs. RKEYREF
Table 1. MAX4028 Clamp Settings for Video Formats
INPUT
FORMAT
CLAMP/KEY
1
Cvbs1
Clamp
2
Cvbs2
Clamp
3
Cvbs3
Clamp
INPUT
FORMAT
CLAMP/KEY
1G’
Clamp
2B’
Clamp
3R’
Clamp
R, G, B have sync on all.
INPUT
FORMAT
CLAMP/KEY
1Gs
Clamp
2B
Key
3R
Key
Gs, B, R have sync only on Green.
INPUT
FORMAT
CLAMP/KEY
1Y
Clamp
2C
Key
3
Cvbs
Clamp
INPUT
FORMAT
CLAMP/KEY
1Y
Clamp
2Pb
Key
3Pr
Key
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4029EWP+ | 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 |
| MAX4029EWP+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 |
| MAX4029EWP-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 |
| MAX402C/D | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage-Feedback Operational Amplifier |
| MAX402CPA | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage-Feedback Operational Amplifier |
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