• AD7731: FAQs

    1) On the datasheet I get the impression that the 'CHOP' variable affects the
    output rate of the sinc3 filter, and therefore the frequency response. So if SF
    = 512 and CHOP = 0, the response is as it is in the datasheet, but then setting…

  • AD7731 Communication Issues

    Hello all,

    I am pulling my hair out. I cannot get any communication from either of the 2 AD7731 ADCs I have.

    I am creating a new hardware rev of a  water sanitation system.

    The OLD hardware was AD7731 and Atmel128.

    New hardware is AD7731 and PIC18f45k22…

  • AD7731: Sinking Current

    1 - I cannot see, from the documentation, what is the maximum supply/sinking
    current on the digital pins (DIN, DOUT, SCK...) of the circuit. I wish to
    interface the AD7731 to th microcontroller board/bus with  optocouplers, but I
    do not know if…

  • Reccomendations for AD7731 replacement

    Hello all,

    Our design was initially using the AD7731 ADC (in 16bit mode). The design has been updated and no longer requires multiple differential channels.

    We now only require 1 differential channel.

    Any recommendations for a low noise ADC replacement…

  • Internal calibration of AD7731

    Hello,

    I have read through the datasheet and, I am not sure if the AD7731 should be disconnected from the analog signal when performing internal zero scale and internal full scale calibration.

    For example, channels 5 and 6 in full differential mode…

  • AD7731 via Arduino SPI

    We're using an Arduino to control an AD7731.  We think the SPI interface is working in that we can 1) trigger a reset by writing four 0xFF bytes and see the RESET pin go low via our logic analyzer and 2) After the reset, we read the Mode register and…

  • AD7731: Continuous Read Mode and Conversion Mode

    In our application the AD7731 does not stop "continuous conversion mode".
    Is it enough to write a 1/1  to RW1/RW2 into communication register?
    (The RDY_ pin signals a valid results always after 1,6ms(600Hz) - like during
    continuous conversion…

  • AD7731: PCB join analog and digital ground planes

    I am designing a PCB with 7 (seven!) AD7731 a/d
    chips and am not sure which is the best point or
    points to join analogue and digital ground planes.
    Is it:-
    a) one join at the 4th 7731 ?
    b) 7 seperate joins at each 7731 ?
    c) another way ?

     

    The…

  • ad7731用于多通道电子秤可行吗?

    基于多通道(9个秤)及速度的原因(每个通道需要60sps),我选择了贵公司的AD7731作为电子秤的AD,用了共三片,设计时按照英文文档上推荐的电路搞的原理图,PCB设计时也参照了相关的要点,比如滤波,分割地,一点连接等,但是现在误差很大,按照60sps的速度,放上50克的砝码,基本内码值上下飘动范围在657~720之间,这样大的误差怎么控制呢?是不是我选的这个AD用于电子秤不太合适呢?请看我的原理和PCB帮我分析下,不胜感激!

  • 51单片机采集AD7731信号问题求解?

    我现在在用AD7731做一个采集力值传感器信号的模块,主要有以下几个问题:
    1、为了检测和单片机通信是否正确,我在初始化完成之后检测了Rdy是否拉低,结果检测到其拉低了,这是否说明初始化成功?
    2、我使用的传感器最高输出电压是30mv,那么如果用内部PGA的话寄存器怎么设置?
    如果哪位高手有代码的话,能否发一部分参考下,万分感谢!O(∩_∩)O哈