Datasheet > LMH6574MAX/NOPB

LMH6574MAX/NOPB

更新时间： 2024-02-07 06:46:33

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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技术参数
数据手册

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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,.25	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS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-G14	JESD-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 mm	Base Number Matches：	1

LMH6574MAX/NOPB 数据手册

Application Notes (Continued)

Other Applications

The LMH6574 could support a multi antenna receiver with

up to four separate antennas. Monitoring the signal strength

of all 4 antennas and connecting the strongest signal to the

final IF stage would provide effective spacial diversity.

For direction finding, the LMH6574 could be used to provide

high speed sampling of four separate antennas to a single

DSP which would use the information to calculate the direc-

tion of the received signal.

20119719

DRIVING CAPACITIVE LOADS

FIGURE 4. Delay Circuit Implementation

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_OUT, to stabilize the amplifier

output under capacitive loading. Capacitive loads of

5 to 120 pF are the most critical, causing ringing, frequency

response peaking and possible oscillation. The chart “Sug-

gested R_OUTvs. 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

0.5 dB or less of peaking in the frequency response. This

gives a good compromise between settling time and band-

width. 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.

If it is important in the end application to make sure that no

two inputs are presented to the output at the same time, an

optional delay block can be added, to drive the SHUTDOWN

pin of each device. Figure 4 shows one possible approach to

this delay circuit. The delay circuit shown will delay SHUT-

DOWN’s H to L transitions (R₁and C₁decay) but won’t delay

its L to H transition. R₂should be kept small compared to R₁

in order to not reduce the SHUTDOWN voltage and to

produce little or no delay to SHUTDOWN.

With the SHUTDOWN pin putting the output stage into a

high impedance state, several LMH6574’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 5 shows how to compensate

for this effect. For the 16:1 MUX function shown in Figure 5

below the gain error would be about −0.8 dB, or about 9%. In

the circuit in Figure 5, 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).

20119724

FIGURE 6. Decoupling Capacitive Loads

20119717

FIGURE 5. Multiplexer Gain Compensation

Disabling of the LMH6574 using the EN pin is not recom-

mended for use when doing multiplexer expansion. While

disabled, If the voltage between the selected input and the

chip output exceeds approximately 2V the device will begin

to enter a soft breakdown state. This will show up as reduced

input to output isolation. The signal on the non-inverting

input of the output driver amplifier will leak through to the

inverting input, and then to the output through the feedback

resistor. The worst case is a gain of 1 configuration where

the non inverting input follows the active input buffer and

(through the feedback resistor) the inverting input follows the

voltage driving the output stage. The solution for this is to

use shutdown mode for multiplexer expansion.

20119715

FIGURE 7. Suggested R_OUTvs. Capacitive Load

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型号	品牌	描述	获取价格	数据表
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LMH6580VS	NSC	8x4 500MHz Analog Crosspoint Switch, Gain of 1, Gain of 2	获取价格
LMH6580VS/NOPB	TI	具有可选增益的 5V、交叉点/交换、8 输入 4 输出 500MHz 开关 \| PFB \|	获取价格
LMH6580VSX	TI	IC 8-CHANNEL, CROSS POINT SWITCH, PQFP48, TQFP-48, Multiplexer or Switch	获取价格
LMH6581	NSC	8x4 500MHz Analog Crosspoint Switch, Gain of 1, Gain of 2	获取价格

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