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LMH6574MAX/NOPB

更新时间： 2024-02-16 11:29:10
品牌 Logo 应用领域
美国国家半导体 - NSC 光电二极管
页数 文件大小 规格书
14页 848K
描述
IC 4-CHANNEL, VIDEO MULTIPLEXER, PDSO14, SOIC-14, Multiplexer or Switch

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中文翻译

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LMH6574MAX/NOPB 技术参数

是否Rohs认证： 符合生命周期：Transferred
包装说明：SSOP, SOP14,.25Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.25模拟集成电路 - 其他类型：VIDEO MULTIPLEXER
JESD-30 代码：R-PDSO-G14JESD-609代码：e3
长度：8.64 mm湿度敏感等级：1
负电源电压最大值（Vsup）：-6 V负电源电压最小值（Vsup）：-3 V
标称负供电电压 (Vsup)：-3.3 V信道数量：4
功能数量：1端子数量：14
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SOP14,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH峰值回流温度（摄氏度）：260
电源：+-3.3/+-5 V认证状态：Not Qualified
座面最大高度：1.75 mm最大信号电流：0.02 A
子类别：Multiplexer or Switches最大供电电流 (Isup)：18 mA
最大供电电压 (Vsup)：6 V最小供电电压 (Vsup)：3 V
标称供电电压 (Vsup)：3.3 V表面贴装：YES
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：3.9 mmBase Number Matches：1

LMH6574MAX/NOPB 数据手册

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disable function only affects the output buffer. When in shut-  
down mode, minimal power is consumed. The shutdown  
function is very fast, but causes a very brief spike of about  
400 mV to appear on the output. When in shutdown mode  
the LMH6574 consumes only 1.8 mA of supply current. For  
maximum input to output isolation use the shutdown func-  
tion.  
Application Notes (Continued)  
The LMH6574 has a current feedback output buffer with gain  
determined by external feedback (RF) and gain set (RG)  
resistors. With current feedback amplifiers, the closed loop  
frequency response is a function of RF. For a gain of 2 V/V,  
the recommended value of RF is 575Ω. For other gains see  
the chart “Suggested RF vs Gain”. Generally, lowering RF  
from the recommended value will peak the frequency re-  
sponse and extend the bandwidth while increasing the value  
of RF will cause the frequency response to roll off faster.  
Reducing the value of RF too far below the recommended  
value will cause overshoot, ringing and, eventually, oscilla-  
tion.  
The EN pin only disables the output buffer which results in a  
substantially reduced output glitch of only 50 mV. While  
disabled the chip consumes 4.7 mA, considerably more than  
when shutdown. This is because the input buffers are still  
active. For minimal output glitch use the EN pin. Also, care  
should be taken to ensure that, while in the disabled state,  
the voltage differential between the active input buffer (the  
one selected by pins A0 and A1) and the output pin stays  
less than 2V. As the voltage differential increases, input to  
output isolation decreases. Normally this is not an issue. See  
the section on MULTIPLEXER EXPANSION for further de-  
tails.  
Since all applications are slightly different it is worth some  
experimentation to find the optimal RF for a given circuit. For  
more information see Application Note OA-13 which de-  
scribes the relationship between RF and closed-loop fre-  
quency response for current feedback operational amplifiers.  
The impedance looking into pin 12 is approximately 20Ω.  
This allows for good bandwidth at gains up to 10 V/V. When  
used with gains over 10 V/V, the LMH6574 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.  
To reduce the output glitch when using the SD pin, switch the  
EN pin at least 10 ns before switching the SD pin. This can  
be accomplished by using an RC delay circuit between the  
two pins if only one control signal is available.  
Logic inputs "SD" and "EN" will revert to the "High", while  
"A0" and "A1" will revert to the "Low" state when left floating.  
MULITPLEXER EXPANSION  
SD vs. EN  
Figure 3 shows an 8:1 MUX using two LMH6574’s.  
The LMH6574 has both shutdown and disable capability.  
The shutdown feature affects the entire chip, whereas the  
20119718  
FIGURE 3. 8:1 MUX USING TWO LMH6574’s  
11  
www.national.com  
1...891011121314

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