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參數(shù)資料
| 型號： | LMH6572MQ |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 多路復用及模擬開關 |
| 英文描述： | Triple 2:1 High Speed Video Multiplexer |
| 中文描述： | TRIPLE 2-CHANNEL, VIDEO MULTIPLEXER, PDSO16 |
| 封裝： | SSOP-16 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 409K |
| 代理商： | LMH6572MQ |
Application Notes
(Continued)
R
2
should be kept small compared to R
1
in order to not
reduce the ENABLE voltage and to produce little or no delay
to ENABLE.
Other Applications
The LMH6572 may be utilized in systems that involve a
single RGB channel as well whenever there is a need to
switch between different “flavors” of a single RGB input.
Here are some examples:
1.
RGB positive polarity, negative polarity switch
2.
RGB full resolution, High Pass filter switch
In each of these applications, the same RGB input occupies
one set of inputs to the LMH6572 and the other “flavor”
would be tied to the other input set.
DRIVING CAPACITIVE LOADS
Capacitive output loading applications will benefit from the
use of a series output resistor R
OUT
.
Figure 6
shows the use
of a series output resistor, R
output
under
capacitive
loading.
5 to 120 pF are the most critical, causing ringing, frequency
response peaking and possible oscillation. The chart “Sug-
gested R
OUT
vs. Cap Load” gives a recommended value for
selecting a series output resistor for mitigating capacitive
loads. The values suggested in the charts are selected for .5
dB or less of peaking in the frequency response. This gives
a good compromise between settling time and bandwidth.
For applications where maximum frequency response is
needed and some peaking is tolerable, the value of R
OUT
can be reduced slightly from the recommended values.
Capacitive
loads
of
LAYOUT CONSIDERATIONS
Whenever questions about layout arise, use the evaluation
board as a guide. The LMH730151 is the evaluation board
supplied with samples of the LMH6572. To reduce parasitic
capacitances, ground and power planes should be removed
near the input and output pins. For long signal paths con-
trolled impedance lines should be used, along with imped-
ance matching elements at both ends. Bypass capacitors
should be placed as close to the device as possible. Bypass
capacitors from each rail to ground are applied in pairs. The
larger electrolytic bypass capacitors can be located farther
from the device, the smaller ceramic capacitors should be
placed as close to the device as possible. In
Figure 1
and
Figure 2
, the capacitor between V
+
and V
is optional, but is
recommended for best second harmonic distortion. Another
way to enhance performance is to use pairs of .01 μF and
.1 μF ceramic capacitors for each supply bypass.
20109619
FIGURE 5. Delay Circuit Implementation
20109624
FIGURE 6. Decoupling Capacitive Loads
20109604
FIGURE 7. Recommended R
OUT
vs. Capacitive Load
20109613
FIGURE 8. Frequency Response vs. Capacitive Load
L
www.national.com
10
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6572MQ/NOPB | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6572MQX | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6572MQX/NOPB | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| LMH6574 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4:1 High Speed Video Multiplexer |
| LMH6574_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:4:1 High Speed Video Multiplexer |
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