Hi,
According to the datasheet, the difference between LT5400-3 and LT5400-4 is only for the resistor value.
What will be the biggest impact if I change to the part to LT5400-4 instead of LT5400-3? *in existing design was using LT5400-3.
Also considering…
Hi,
My customers are considering using the LT 5400.
Is there data on the Derating Curve( Ta ) of the LT 5400?
Or is there a graph of Power Dissipation vs Thermal Resistance Curve?
Best regards,
Yuya
In our design we require the Temperature Coefficient of the Resistor's Matching Ratio will be max 0.2ppm/°C ( "0.2ppm/°C Matching Temperature Drift" as per datasheet). That is the most important parameter in the design.
I can see…
 PDF |
This KWIK (Know-how With Integrated Knowledge) Circuit FAQ is a step-by-step guide that goes through the key considerations when designing a wide bandwidth discrete programmable gain instrumentation amplifier (PGIA). The circuit highlighted in… |
Hi,
Lower gains can operate up to the MHz-range but unfortunately for G=1000, highest BW is up to 150kHz only.
Another solution you can try is to use discrete circuits - differential amplifier + resistor network.
You can check LT5400-2, a quad matched resistor…
Mark,
The resistors I have are .1% and 25ppm so I was hoping they would be good enough especially as you pointed out with the ratiometric measurement. The CN0545 is exactly what I am following but with the AD7124-8PMDZ board. This will be interfaced to…
Hello,
Yes it is quite hard to find a discrete diff amp with wideband as 200MHz.
You can opt to use ADA4817 but I suggest, you have to use matched resistors network rather than discrete one.
You can check LT5400 for quad matched resistor network.
The LT5400…
Fully differential and difference amplifiers usually have very high common-mode rejection (CMRR). In practice, when resistors are configured around the amplifiers, the matching of those resistors can often dictate the overall CMRR. What you have observed…
DB,
You will find that the majority of error, especially over temperature, usually comes from the resistors.
You can go to Digikey.com and buy 5%, 2%, 1%, 0.1% resistors, etc. with tempcos of 50 ppm, 25 ppm, etc.
but the best thing is to use a monolithic…
我有两点建议
1. 检测输出端过压，然后需要关闭的是电源而不是输出端，因为你是恒流源输出，相当于用一个高阻堵住了电流，但是这样你的恒流源电路会失效，可能会导致运放饱和。所以我觉得关闭电源也许会更好；
2. 这个电流源的拓扑的输出阻抗会受到两个5k和1k的电阻对的匹配度的限制，所以更好的选择如下：
记住差动放大器的比例电阻一定选择0.1% 以上精度，最好可以选择LT5400-3，以实现86dB的CMRR。
