• Opamp AD8692 stability issue.

    I have an amplifier AD8692 used for voltage sensing with opto coupler for isolation. it is quite unstable in the whole range of input voltage. 

    i have tried to simulate it in ltspice and its quite stable. maybe the model is not so perfectly represented…

  • RE: LTspice库里面找不到AD8692元件怎么办?

    AD8692用AD8691的spice模型,AD8692是双运放,AD8691是单运放。

    其他器件如果在LTspice中找不到,可以到ADI官网上下载相关spice模型(.cir文件),每一个运放的页面基本都能找到相关的spice模型(一般在Datasheet下面)。然后将cir文件导入到LTspice中自建电路模型。

    附件中是如何在LTspice中导入模型文件的方法:
     PDF

  • RE: PDF footprint dimension drawings

    I can't find them for AD8692 opamp and ADCMP608 comparator. No special footprints, I just wanted to double-check.

  • RE: ADA4530-1 Die level option

    Hi Mika,

    We currently don't have ADA4530-1 in a die level and I'm  not sure if we will have in the near near future. However, i found these few devices with 1pA typical bias current operational amplifiers in die/chipscale package. We have AD8691…

  • RE: AD8618 supply decoupling

    FormerMember
    FormerMember

    Elias,

      What does TRRS mean??

      What is your highest signal frequency?

      Depending on whether you need to go to DC or not and can AC couple, you could use op amps

    that have millivolts of offset, rather than <100 uV which drives up the price.

      Also…

  • RE: CN0276 EXC filter design

    Hi firman,

    Figure 12 is the phase shift between the AD2S1210 EXC and SIN pins which shows how the noise from EXC pins of AD2S1210 was improved.  This is because of the amplifiers which acts as an active filter found at the resolver excitation(which uses…

  • AD8348 with added baseband gain

    I say you chaps...

    I've added two LNA (MAX2634 - sorry!) and active filters with gain at baseband. It's a tough one to keep stable!

    A SPICE model for the AD8348 would have been nice, to check the bias. I have built it, it does work, -100dBm…

  • RE: ADMP441, SSM2529 Speech transmission

    Thank you for a thorough explanation.

    I have looked further at your catalog of op-amps. Since I am designing a portable unit, I examined the following, with 5 V supply:

    AD8605/AD8606/AD8608, AD8691/AD8692/AD8694, AD8655/AD8656, and the ADA4075-2.

  • RE: 印象•ADI放大器——有奖互动,说出你的ADI放大器印象

    ADI放大器给我的印象就是产品丰富,可靠性高。

    再说说如何选择不同的放大器。

    (1)确定放大器的用途和应用场合:放大、滤波、积分、隔离,还是低频、高频、音频等。

    (2)确定放大器的输入输出、电源、使用温度环境范围。电源分单电源和双电源。

    (3)确定关键技术指标。比如滤波电路需要首先考虑放大器带宽,电荷放大电路首先考虑低失调电流等。

    (4)根据PCB和产品尺寸,确定封装形式。

    (5)结合产品手册选型。

    实例:在设计一个传感器的调理电路时,需要用到放大器进行放大,信号频率不高<1MHz…

  • 读取AD2S1210角度与实际相差180°

    公司一个项目用到AD2S1210,目前正在熟悉阶段。今天使用CN0276推荐的电路进行试验时,发现读到的角度总是比实际给的角度始终大180°(如实际位置为10°,用AD2S1210测的是190°,实际位置为45°,用AD2S1210读到的位置是225°)。我对CN0276中给的电路仅修改了激励放大系数(图1)和相应的sin和cos系数(图2,旋变压比为0.5,到sin和cos引脚的VP-P为3.1V),使用2.5kHz的激励,锁相在±44°内。…