• AD620与AD8403一起使用的问题

            AD620放大带有2v偏置的交流小信号（几十mv，频率在100hz左右），单片机STM32控制可编程电阻器AD8403调节AD620的放大倍数，AD620输出前和输出后的rc滤波器去除交流小信号的2v直流偏置，具体电路如下图，

    电路设计出来遇到的问题：1、AD620的增益跟调节预期相差很大；

                                              2、AD620所能放大的信号频率只有400HZ不到，跟手册上所说的带宽严重不符；

                                              3、当IN+无输入时，out端有1v的直流电压输出，即使IN+和IN-短接接到地还是有1V的电压输出。

            目前…

  • RE: AD8403A10 communication Check !

    Hi koka,

    Safety in the communication lines must be embedded to the design of the chip. The AD8403 cannot interpret any additional data that the microcontroller sends and the only way to check if the data is incorrect is if the AD8403 doesn't respond…

  • RE: 这论坛不行啊，提个问题1个月就一个人来回答，而且回答一次后就没了

    AD620与AD8403一起使用的问题

  • RE: AD8403A10 wiper resistance

    Hi koka,

    Apologies for the late reply.

    Firstly, I would like to know how did you find out the wiper resistance for different steps.

    The specification that you should be looking is DNL. The typical DNL value of the AD8403 is 1/4LSB which approximately…

  • Comment on AD8403: Connecting to digital

    Hello,

    I use AD8403 A10 digital potentiometer.Is a 10K potentiometer ? is it true, why I write "0001000000" and must have 2.5 k(10k/256 * 64) between W1 and A1 pins but I see 2k in these pins ? what's problem ?

  • Parallel DigiPot (AD8304) as gain setting resistor for Instrumentation Amp (AD8422)

    Hi All...........

    Just wondering if you can you parallel up the 4 stages inside the AD8403 to make nom 250R and use them as Rg for In-Amp ?


    This is mainly for calibration of the front end and not dynamic gain changing. Once set for a particular input…

  • End resistance

    Hello,

    I'm using AD8403 50kOhm and 10kOhm variable resistors for my application, but the maximum resistance I can get is around 43kOhm for 50kOhm resistors and around 9200Ohm for 10kOhm resistors. At the beginning of development of aplication I've used…

  • RE: AD8304 and frequency calculation/measurement

    Dear Asaf,

    OK, thank you for your clearance. I believe your case would see:

    1.       A CW laser source generates a constant laser optical power Px in the range of (-60dBm, + 10dBm);

    2.       one optical modulator that generates the “pulse”. The resulted pulse…

  • Beyond the ADALP2000

    The ADALP2000 Analog Parts Kit contains a wide range of components that are a great place for someone just starting to explore electronics and electrical engineering to get the basics. But, as you would expect, given the $45 price budget, it can’t contain…

  • TAGS LIST: Data Converters

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