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參數資料
| 型號： | LMH6570MAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 多路復用及模擬開關 |
| 英文描述： | 2:1 High Speed Video Multiplexer |
| 中文描述： | 4-CHANNEL, VIDEO MULTIPLEXER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 9/14頁 |
| 文件大小： | 831K |
| 代理商： | LMH6570MAX |
Application Notes
GENERAL INFORMATION
The LMH6570 is a high-speed 2:1 analog multiplexer, opti-
mized for very high speed and low distortion. With selectable
gain and excellent AC performance, the LMH6570 is ideally
suited for switching high resolution, presentation grade video
signals. The LMH6570 has no internal ground reference.
Single or split supply configurations are both possible, how-
ever, all logic functions are referenced to the mid supply
point. The LMH6570 features very high speed channel
switching and disable times. When disabled the LMH6570
output is high impedance making MUX expansion possible
by combining multiple devices. See “Multiplexer Expansion”
section below. The LMH6570 SEL defaults to logic low (IN0
active). The default state for the SD pin is also logic low
(device enabled). Both pins can be left floating if the default
state is desired.
VIDEO PERFORMANCE
The LMH6570 has been designed to provide excellent per-
formance with production quality video signals in a wide
variety of formats such as HDTV and High Resolution VGA.
Best performance will be obtained with back-terminated
loads. The back termination reduces reflections from the
transmission line and effectively masks transmission line
and other parasitic capacitances from the amplifier output
stage.
Figure 1
shows a typical configuration for driving a
75
cable. The output buffer is configured for a gain of 2, so
using back terminated loads will give a net gain of 1.
FEEDBACK RESISTOR SELECTION
The LMH6570 has a current feedback output buffer with gain
determined by external feedback (R
) and gain set (R
)
resistors. With current feedback amplifiers, the closed loop
frequency response is a function of R
F
. For a gain of 2 V/V,
the recommended value of R
is 576
. For other gains see
the chart “Suggested R
vs Gain”. Generally, lowering R
F
from the recommended value will peak the frequency re-
20129922
FIGURE 1. Typical Application
20129932
FIGURE 2. Suggested R
F
vs. Gain
L
www.national.com
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| LMH6570 | 2:1 High Speed Video Multiplexer |
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| LMH6574MA | 4:1 High Speed Video Multiplexer |
| LMH6574MAX | 4:1 High Speed Video Multiplexer |
| LMH6622 | Dual Wideband, Low Noise, 160MHz, Operational Amplifiers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6570MAX/NOPB | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量: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 |
| LMH6572 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Triple 2:1 High Speed Video Multiplexer |
| LMH6572_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Triple 2:1 High Speed Video Multiplexer |
| LMH6572MQ | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量: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 |
| LMH6572MQ/NOPB | 功能描述:多路器開關 IC RoHS:否 制造商:Texas Instruments 通道數量:1 開關數量: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 |
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