• ADA4940-1 datasheet REV B, error figure 61

    On page 20 of the REV B datasheet  there is a diagram 'Figure 61'. Inside are
    part numbers, ADA4840-1 and ADA4940-2. I assume ADA4840-1 is an error?


    This is a typo error and the second ADA4840-1 will be removed from Figure…
  • ADA4940-1  configuration

    Dear sir,

    I am using  ADA4940-1  for Single Ended to Differential for my Application.

    I observed that ,when i gave  50mV to 1200mV as input and i got result  with less variations (uV variations). If i am trying to give >1200mV , i obeserved   big variation…

  • ADA4940-1 and AD7982 connection


    In ADC and driver simulation tool, there is only one option "INVERT" for ADA4940-1 connecting to AD7982. I don't want my ADC reading reverse. Can I cross connection, which means  ADA4940-1 Out+ connecting to AD7982 In-, while ADA4940-1…

  • What the difference between the ADA4940-1 and the ADA4941-1?

    What is the difference between the ADA4940-1 and the ADA4941-1? They are both ADC drivers, but what distinguishes the two parts from each other?

  • RE: ADA4940-1 Vocm MAX&MIN

    Hi Yuji,

    Thanks for the additional information. The 0.9V Vocm should work to ADA4940-1.

    Upon checking the AD9634, I could see some recommended ADC driver  that could provide excellent performance like ADA4937-1 and ADA4930-1. Have you been able to consider…

  • RE: 关于运算放大器ADA4940-1的一些使用问题

    1. 如果没有50Ω阻抗匹配要求,是不需要再接入RT的,有一个技巧就是,从RG的输入端往左看,是信号源的阻抗,这个等效阻抗你看是0R还是50R,然后再往右看,看ADA4940的等效阻抗为多少,如果需要50R匹配,则需要将输入阻抗也调节成50R,这样就需要RT,如果不需要就不必关注。

    2. ADI的运放都有输入的保护,但作为系统设计者,你不能依赖器件自身的保护,因为器件自身的保护也会有能量的极限,所以最好还是在输入端加入二极管保护;

    3. 即便是Disable,依然需要保护;

    4. 我觉得当然可以…

  • Terminating a Single-Ended Input for ADA4940-1


    I want to convert single - ended input to differential ended for driving ADC. I have gone through datasheet of ADA4940-1 in which calculations are given to terminate single ended input. For known source impedance I am using LTC6252 as buffer. But…

  • ADA4940-1 - Current Supply Drawn from Vocm pin?


    May i know based on the ADA4940-1 datasheet, how can we derive the current required for Vocm pin?

    Given that the input resistance stated is 250kohm, does it means that if inject 2.5V, the current drawn will be 10uA?

  • Question about power supply on ADA4940-1 (SOIC)

    On the datasheet for the ADA4940-1 ADC Driver, it is noted that there is a flexible power supply: 3V to 7V (LFCSP).  How does the SOIC package differ?  What is the maximum power supply for the SOIC? Would -Vs=0 +Vs=5V be a problem (SOIC)?

  • ADA4940-1 for differential active bandpass filter at 400 kHz.

    I am using a pair of ADA4940-1 to design a differential active bandpass filter at 400 kHz. The Akerberg Mossberg topology looks the most promising. (See TI's app note SLOA064, figure 11, attached). Does this make sense or is there a better way or better…