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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： | 10/14頁 |
| 文件大?。?/td> | 831K |
| 代理商： | LMH6570MAX |
Application Notes
(Continued)
sponse and extend the bandwidth while increasing the value
of R
F
will cause the frequency response to roll off faster.
Reducing the value of R
F
too far below the recommended
value will cause overshoot, ringing and, eventually, oscilla-
tion.
Since all applications are slightly different it is worth some
experimentation to find the optimal R
for a given circuit. For
more information see Application Note OA-13 which de-
scribes the relationship between R
and closed-loop fre-
quency response for current feedback operational amplifiers.
The impedance looking into pin 8 is approximately 20
. This
allows for good bandwidth at gains up to 10 V/V. When used
with gains over 10 V/V, the LMH6570 will exhibit a “gain
bandwidth product” similar to a typical voltage feedback
amplifier. For gains of over 10 V/V consider selecting a high
performance video amplifier like the LMH6720 to provide
additional gain.
EVALUATION BOARDS
National Semiconductor provides the following evaluation
boards as a guide for high frequency layout and as an aid in
device testing and characterization. Many of the data sheet
plots were measured with this board.
Device
LMH6570
Package
SOIC
Evaluation Board
LMH730277
An evaluation board can be shipped when a sample request
is placed with National Semiconductor. Samples can be
ordered on the National web page. (www.national.com)
MULTIPLEXER EXPANSION
With the SHUTDOWN pin putting the output stage into a
high impedance state, several LMH6570’s can be tied to-
gether to form a larger input MUX. However, there is a
loading effect on the active output caused by the unselected
devices. The circuit in
Figure 3
shows how to compensate
for this effect. For the 8:1 MUX function shown in
Figure 3
below the gain error would be about 0.7% or 0.06dB. In the
circuit in
Figure 3
, resistor ratios have been adjusted to
compensate for this gain error. By adjusting the gain of each
multiplexer circuit the error can be reduced to the tolerance
of the resistors used (1% in this example).
BUILDING A 4:1 MULITPLEXER
Figure 4
shows an 4:1 MUX using two LMH6570’s.
20129917
FIGURE 3. Multiplexer Gain Compensation
L
www.national.com
10
相關PDF資料 |
PDF描述 |
|---|---|
| LMH6570 | 2:1 High Speed Video Multiplexer |
| LMH6574 | 4:1 High Speed Video Multiplexer |
| 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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