• AD7982: Driving the reference input

    I am currently designing a circuit that uses a pulSAR ADC, specifically the
    AD7982, and am having difficulties understanding the choice of components
    required for driving the reference pin.

    The data sheet for the device recommends using a buffer…

  • Connection of exposed pad in AD7982 LFCSP package

    How best to connection the exposed pad on the AD7982 in LFCSP package?

     

    For the LFCSP package, the expose pads is not internally connected to the die.
    More
    specifically is for thermal relief.

    This would fall under the general rules for expose…

  • pulsar adc ad7982 evaluation board strange behavior

    Hi,

    I'm trying to make the pulsar pmod evaluation board, work with a Nexys 4 DDR FPGA in a true differential setup. I'm powering up the evaluation board externally with +7.5V, GND, and -2.5V as recommended and the jumper JP1 is at the position 'A', the…

  • EVAL-AD7982-PMDZ, High THD-3 level.

    I 'm testing Eval-ad7982-pmdz and comparing THD results with Eval-7984-pmdz. 

    In contrast to charts provided in datasheets, adc7982 shows worse  results in exactly the same test conditions.

    Difference is more than 10 dBc  with 2 kHz sine signal. 

    AD7984…

  • ad7982 sdo管脚无输出

    买了一块AD7982的pMODs 评估板,参考官网,三个端子给-2.5V GND 7.5V电压

    参考官方的代码,做了一个stm32 GPIO驱动文件,具体接线参考下图,VCC接3.3V

    但是始终没有数据输出,使用逻辑分析仪抓取波形(SPI使能管脚接模块的CNV)

    对比数据手册中的时序图

    应该是可以触发读取数据的,但是MISO始终为低电平。

    测量AD7982的Vref管脚,电压为5V,芯片应该是工作的(JP1跳线为单端模式)。

    不知道问题出在哪里,有时间帮忙分析一下,谢谢。

  • Ad7982 SDO pins have no output

    I bought a pMODs evaluation board of AD7982. Refer to the official website. The three terminals give -2.5V GND 7.5V voltage

    Refer to the official code, made a STM32 GPIO driver file, specific wiring reference figure below, VCC connection 3.3V

    But…

  • How to make input impedance of EVAL-AD7982-PMDZ to be high?

    I am trying to use EVAL-AD7982-PMDZ to digitize voltage signals from a capacitive amplifier.  I want the input impedances of the input signal ports to be high (~1 MOhm).  However, in EVAL-AD7982-PMDZ, there are bypass capacitors (C2, C3, C5) and a bypass resistor…

  • ADA4940-1 and AD7982 connection

    Hi

    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…

  • Reflow temperature of AD7982

    Good day,

           Can you check the reflow temperature of AD7982, our prototype are all damaged under 220℃ .