• LT5400 - Matching Ratio Temperature Drift - stability, different parameters

    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…

  • LT5400 Derating Curve

    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

  • RE: Differential Amplifier with higher gain bandwidth??

    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…

  • RE: ADA4817 differential probe

    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…

  • RE: Instrumentation Amplifier Gain resistor(s)

    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…

  • RE: There is an error at the output due to the resistor matching. How can I minimize or eliminate this error?

    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…

  • RE: ADA4870构成电流源的过压保护问题

    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。

  • RE: LT1997-2 Distortion Specs

    In my application LT1997-2 internal OPAMP will operate inside [V– ; V+ – 1.75V] so it won't transition into OTT mode. The LT5400 solution will provide worse CMRR inside 0-1kHz range. I don't have oppurtiny to do the THD benchmarking on LT1997-2 eval,…

  • RE: Using the LT6015 to monitor a stack of four 3.2V 100Ah LiFePO4 cells?

    Hi,

    It seems to be workable. If you need well matched resistors, you may use LT5400-2 which can give you up to 0.01% matching. You could also add some capacitors for filtering in parallel with the feedback resistors R2 and R6 and R4 and R8 to ground.…

  • LTC6363 single-ended to differential

    We try to use LTC6363 to convert the input single-ended signal into a differential signal. The Gain factor was calculated to be 1, but the actual measured gain factor was 0.7. The resistor we used is LT5400-5, an 1MΩ resister pack. Could you help me solve…