• AD7708 strange behaviour at cold temperatures

     

    Hello there,

    With the AD7708, we are experiencing a strange behavior with sudden changes of temperature.

    If there is a rapid cooling of the device down to -40 Celsius, it happens that a reading is completely erroneous.

    This behavior happened when…

  • About two rates of AD7708

    Hello,

    About the AD7708,

    Please let me know the difference between "update rate" and "conversion rate".


    Both "update rate" and "conversion rate" seem to mean f_ADC.

    <AD7708 Datasheet P29>

    Regards,
    Tatsu

  • Crystal Oscillator selection for AD7708

    I don't see any specifics in the datasheet for the AD7708 regarding crystal selection, other than frequency.  Are there guidelines regarding tolerance, stability, and load capacitance?  Thanks.

  • AD7708 reference: ref195 or ref192?

    the AD7708 datasheet (rev 0) mentions & illustrates use of either the  ad780 or ref195 to generate the reference, all the while saying 2.5V....which seems to be a ref192 instead. this caught my eye as i've a need to convert unipolar signals that are…

  • AD7708的一些问题

    1、AD7708是否双电源供电吗?哪个参数决定AD芯片是否可以双电源供电。

    双电源供电和单电源供电分别有什么好处和坏处?

    2、

    我这样理解这三个参数对吗?

    (1)差分输入满量程电压            正负1.024*refin*gain                 REFIN和REFIN1和REFIN2有关,REFIN=REFIN(+)-FEFIN(-)

    疑问:如果REFIN1和REFIN2都有参考电压这个该如何计算REFIN的电压呢

    (2)AIN的绝对电压范围            Vmin  AGND+100mV  Vmax AVDD-100…

  • AD7708的负压问题

    我用AD7708采集一路电压信号,有用的信号范围是0~2.5V,但是这个信号也能是负压,因为AD7708不能采负压,我用了一个二极管将负电压钳到二极管的Forwad电压(-0.7V),这样会损坏AD7708吗?

    AD7708 datasheet上说明模拟输入的范围是“ Analog Input Voltage to AGND . . . . –0.3 V to AVDD +0.3 V

    如果模拟输入引脚电压是 -0.7V,会损坏AD芯片吗?

    见附件图

    谢谢!

  • AD7708 AINCOM使用问题

    专家,您好

                      AD7708的AINCOM脚(All analog inputs are referenced to this input when configured in pseudo-differential input mode.)我的理解是:所有模拟输入时引用这个输入时配置伪差分输入模式。

                     四对共地的伪差分输入AIN1/AIN2/AIN3/AIN4的负端(AIN-)共用AINCOM脚? 不用每个差分对的负都接AIN么?也就是四对的话我只需要接四个正端 和…

  • About the Filter Register setting of AD7708

    Hello,

    In the single conversion mode of AD7708,
    if t_ADC is shortened by 80msec by the setting of Mode Register,
    Specifically, which period will be reduced by 80msec?
    Is it correct to understand that the period from when a single conversion is instructed…

  • 请问AD7708的Vref+能否连接5V

    1. 请问,AD7708的Vref+能否连接5V,Vref-连接GND,能否这样连接使用

    2. 实际项目采用了上面描述的参考电压,在使用中发现各个AIN为5V时,通过mcu读取的AD值,大约只能到达63790,而不是65535.