• RE: AD7985 Data Registers

    Hi Brandon,

    By reference materials, do you mean example code for a microcontroller?

    The closest thing to that that we have is the AD7980 No-OS driver linked above, but that uses the 4-Wire without Busy mode, not the 3-wire option. It may not be exactly…

  • RE: AD7985 datasheet question

    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    …

  • RE: AD7985时钟偶尔出现异常，导致数据输出异常的问题

    SCK 是用户的控制器来发送的时钟信号，AD7985只是高阻输入引脚。

    要确认这个问题，最好用示波器测量CNV, SCK, SDO波形，看一下。

  • 关于AD7985芯片进行数据读取的问题

    我用STM32来对AD7985进行控制，进行电压采集，使用的是最简单的三线式无繁忙指示。在输入端给3.3v的直流电压，但是采到的电压值都是些毫无规律且一直在变动，具体的程序是按照数据手册里的时序一步一步来的，我不知道是不是时钟或者延时什么的没有设置好，求帮帮忙，挺急的，网上也没什么资料，下面附上时序图和部分程序。

    • attachments.zip

  • AD7985芯片SDO管脚中断输出问题

    AD7985芯片已设置为/CS模式（三线式且有繁忙指示）。

    设置方法：TURBO管脚下拉，SDI上拉，SDO接10K的上拉。输出给CNV时钟（1.953Mhz）；

    问题现象：CNV时钟保持高电平20ns时发现SDO脚一直是低电平，无法检测到中断。后来将CNV时钟的高低电平翻转发现SDO脚上升到高电平是个缓慢的过程。按照手册上描述CNV有上升沿启动转换SDO即进入高阻态。这是有上拉情况下应该立刻变高。为什么出现缓慢上升的过程呢？

      怎么解决？急求，谢谢！@

  • Questions for your AD7985

    Dear Sir/Madam,

    I am just studing to use your AD7985 with your datasheet page.19, Fig 27 CSB Mode, 3-Wire Without Busy Indicator Serial Interface Timing (SDI High) condition. Also I will be worked AD7985 with fix the procedure of conversion and acquition…

  • RE: A/D USB interface for Si amplified photodiode

    Hi, Vincent.

    The 16-bit AD7985 was used together with a flexible sensor signal conditioning block which can be used for accurate smallsignal measurements in this reference circuit. The AD7985 has an input voltage range of 0-Vref (Vref can be externally…

  • Best ADC for High voltage inputs?

    I’m trying to decide which ADC to use for a high voltage front end.  Here are the requirements for the ADC:

    Fixed input range +/- 50V

    16 bit resolution

    10 Meg input impedance

    1 MHz Bandwidth

    2 or 3 MSPS or greater

    Serial or SPI output

    I’ve been…

  • RE: ADC with really "True differential input"

    Hi vlad8016,

             What Klaus mentioned are right. There are three most common types of ADC input structure a.) Single- Ended b.) Pseudo Differential c.) True Differential.  From your description above I can see that you are looking for ADC that has a pseudo…

  • AD8253 Single input circuit?

    This is the reference circuit about the AD8253 and AD7985.

    There are differencial input ports in the AD8253 and I want to use this device for single input.

    Then how can I connet the other input pin?