• Current source OP1177

Hello,

I would like to use OP1177 for a current source, in data sheet of OP1177 is an example of values ​​Rs and Cs to get stable. I would like to know how have calculated these values, someone can me explain how this affects the stability and control…

• OP1177 Common Mode Voltage

I am trying to use the OP1177 as a differential amplifier to measure a DC current shunt. It will have a gain of 50, 2k and 100K ohm. Most of the time the op1177 will be reading the shunt from the low side. It also needs to be able to read a high side…

Q

I don't find any information about the input impedance in the datasheet. Could
you provide me any?

A

We do not have the data that you are looking for. Based on what we know about
the design, differential resistance is roughly 6 MΩ…

Q

I have a question about OP1177 which I would like to use to amplify very low
signals at low frequencies (current anbd voltage measurement in a railway
system).
However the data sheet does not provide a current noise graph on which I could…
• Evaluation board for AD8421 and OP1177

Hi,

I recently ordered the AD8421 instrumentation amplifier and the OP1177 operational amplifier and would like to know what evaluation boards I could use to test them. Any suggestions?

Thanks,

Chris Rhynes

Q

I'm looking for information about slew rate of the OP2177.

In the datasheet there is only a typical value with one load  (0.7V/µs).

Do you have more data:
- Min / max value over the temperature  range
• OP1177 output ocsillation in  AD5726 datasheet reference circuit

In AD5726 datasheet ,Figure25 have OP1177 voltage follower.

And OP1177 output have 0.2uF capacitor.

But voltage follower OP1177 with output 0.2uF have only a few phase margine  in ADIsim.

I think that this circuit is unstable.

Is this consideration…

• 关于OP1177的供电电源？

在使用OP1177时，需要正负15V供电电压，可是理论上说为了保持模拟电路良好的性能，这个正负15V应该采用模拟的±15V电源，

可是现在仅仅有一个外接的主电源我如下操作：将外置主电源经过简单滤波后和磁阻隔离后作为运放的模拟电源，这样可行吗，对运放的性能是否有影响？还是采用独立的线性稳压源产生专用的±15V模拟电源AVDD_15V和AVDD_-15。

• Inconsistencies in Datasheet Formulas for OP1177 / OP2177 / OP4177

There are few inconsistencies in the "BAND-PASS KRC OR SALLEN-KEY FILTER " section on page 21, Rev. G of this datasheet: http://www.analog.com/media/en/technical-documentation/data-sheets/OP1177_2177_4177.pdf

Formula (3):        Q = K * sqrt(R1 / R2…

• 运放输入阻抗问题 op1177

上面的电路中,反相输入阻抗为100K,而同相输入阻抗为200K,是怎么计算出来的啊?