• problem with AD7683

    Hi!

    I have some problem with AD7683: my STM receive from ADC all zeroes ("0").

    Using AD7683 with STM32F429.

    Power : 3,3V.

    REF : 3V.

    +IN : 0..3V.

    -IN : GND.

    DATACLOCK trying from 2,9MHz to 10KHz.

    Using 24 bit hardware SPI and 22 bit software…

  • AD7683: Stuck bits

    I want to use the AD7683 instead of the 8320 of Burr Brown. The Device dont
    work correctly. The Data output is for some input voltages always the same. No
    bit toggled. The Timing will the same as in the Data sheet.

     

    AD7683 is a Successive…
  • AD7683 Maximum DCLOCK frequency

    Our product use the AD7683 and we have a question.

    We don't fine the maximum DCLOCK frequency in the datasheet.

    We want to increase the DCLOCK frequency for the access speed.

    Would you please send us the maximum DCLOCK frequency information.

    Regards…

  • CMRR of AD7683 and AD7684

    The AD7683 is pseudo differential input and AD7864 is true differential input.
    It is known that the pseudo differential input structure features less CMRR
    than true differential input structure. However, in the datasheet, the CMRR
    spec…
  • AD7683 and Sampling clock

    Hi,

    I need to know how to vary the sampling frequency of AD7683?

    It is written that the sampling clock is internal.

    I need to use this for 1KHz and 256Hz sampling,is this possible?

  • AD7683 verilog parameter question

    Got on e-mail:

    parameter real FPGA_CLOCK_FREQ  = 100;  // FPGA clock frequency [MHz]

    parameter real ADC_CLOCK_FREQ   = 2.3;  // ADC clock frequency [MHz]

    parameter real ADC_CYCLE_TIME   = 10;   // minimum time between two ADC conversions (Tcyc) [us]

    parameter…

  • The accuracy difference of AD7683

    When measuring voltage signal with AD7683, the same board, different AD7683 chip, why some AD chip measurement accuracy is high, some AD chip measurement accuracy is low.Is there a quality problem with the chip?

  • AD7683的DOUT驱动能力

    请问AD7683的DOUT驱动电流输出有多大,能直接驱动无源光耦(约10mA电流)吗?datasheet上并没有标明Dout引脚的驱动能力。而类似的LTC1864则有注明。

  • AD7683数据位数的大小

    使用二片AD7683独立进行温度的测量,VDD供电由5VLDO提供,参考电压由一片ADR02共同提供。IN-接地,IN+分别接测量电压。被测量电压理论上的范围是05V.

    测试时使用的恒定的电阻代替实际的ntc电阻,一个通道的电压是0.454V左右,另一个通道的电压是2.5V左右。

    测量的结果大小是没有问题的,可以读出大致准确的电压值。

    输出的数据精度是有问题的,表现出数据的位宽随被测电压的大小而自动变化。

    具体过程是这样:

    用电阻0ADC芯片0,电阻1ADC芯片1。   0通道…

  • AD7683测量精度差异性

    用AD7683测量电压信号时,同一块板子,不同的AD7683芯片,为什么有的ad芯片测量精度高,有的ad芯片测量精度低。是芯片有质量问题吗?