AM26LS31: 接口论坛

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Part Number: AM26LS31

Datasheet link：

AM26LS31 Quadruple Differential Line Driver datasheet (Rev. M)

1) As for 5.8 Typical Characteristics, as the following Figure5-1 and Figure 5-3; both the description of the figure are Output voltage vs Enable G Input Voltage；

but in fact, Vertical axis show the Y output voltage and Output voltage；

I want to know the difference between between Vertical axis show the Y output voltage and Output voltage；（as theFigure5-1 and Figure 5-3 show, the Vertical axis voltage is different）

2) As the Figure5-5, the Vertical axis is High-Level Output Voltage, I want to know the Output Voltage of High-Level Output Voltage is which one of the question 1)?

That means the High-Level Output Voltage is High-Level Output Voltage or High-Level Y Output Voltage

3）Figure 5-9 description is Y output voltage vs Data Input Voltage; Figure 5-14 description is Y output voltage vs Enable G Input Voltage;

Could you please tell me what is Date Input Voltage and what is Enable G Input Voltage；

1 天前

0 Alice 1 天前

TI__Expert 7130 points

Hello ,

1) it is different in load condition and A input change to show the output feature.

2) VCC=5V in Figure 5-1.

3) we sugget you design regarding the parameter below

0 ?? ? 1 天前回复 Alice

Prodigy 20 points

1) I want to know the difference of Load=470Ω to GND in Figure5-1 and Load=470Ω to VCC, could you please give me the Sketch Map for me to understand?

3) I want to know the difference between Data Input Voltage and Enable G Input Voltage；

4) As you reply in question 3), I have the question that min VIH is so low, due to the RS 422 require the min voltage from Drive is 2V; as you know, the PCB layout and cable from the Am26LS31 to relevant Receiver will has the voltage loss，the design for us is using the AM26LS31 to driving the optocouple aiming at Signal isolation；could you please tell me the true min output voltage for VIH, 2V seems so small to drive the optocouple

0 ?? ? 1 天前回复 Alice

Prodigy 20 points

As the question 3) you reply, could you please give me the condition of MIn VIH 2V( means when this IC will output the 2V?)

0 Alice 1 天前回复 ?? ?

TI__Expert 7130 points

Hello ,

For Vih, if input voltage is higher than (>=) 2v(min value) , the voltage is recognized as high level;

For Vil, if input voltage is lower than (<=) 0.8v(max value), the voltage is recognized as low level;

output voltage are defined at Voh Vol,

0 ?? ? 1 天前回复 Alice

Prodigy 20 points

Sorry, Maybe I write the wrong, I write the question again:

if the VCC is 5V, when input voltage is higher than (>=) 2v(min value); Nornally, I think the output voltage may not the 2.5V( min) of VOH, could you please tell me the condition this IC will output the 2.5V VOH? Due to 2.5V seems a little small for us to drive the optocouple;as you know, the PCB layout and cable from the Am26LS31 to relevant Receiver will has the voltage loss，the design for us is using the AM26LS31 to driving the optocouple aiming at Signal isolation；could you please tell me the true min output voltage for VIH, 2V seems so small to drive the optocouple

0 Alice 4 小时前回复 ?? ?

TI__Expert 7130 points

您好，

这是数据手册中电气参数的定义方法而已（最小典型最大），要参考它的测试条件。

0 ?? ? 4 小时前回复 Alice

Prodigy 20 points

您好，如描述，我需要驱动光耦的初级端，按照收据手册中的最小值来看，似乎算下来电流有一些小，所以需要找您确认下，最小值的条件方便我进一步评估和计算

0 Alice 4 小时前回复 ?? ?

TI__Expert 7130 points

您好，

请参考数据手册电气规格中的“TEST CONDITIONS".

0 ?? ? 3 小时前回复 Alice

Prodigy 20 points