• AD7768-1 问题

    我正在使用AD7768-1芯片，遇到以下问题：
    1.抽取率设置成X32、X64时从转换结果寄存器读到的值有时候都是0，有时候全是参考电压对应AD值，设置成128,256则可以读取到正确的AD值
    2.参考电压是3V，采集一个1khz，幅值2v的正弦电压的1024个数据，把采集到的AD值转换成电压值，转换结果整体能还原成正弦波，但是偶尔会有一些转换结果比较异常，接近参考电压值压值3v。
    当前使用SPI控制模式，单次读取模式。

    参数设置：
    //启动
    ad7768_spi_reg_write(AD7768_REG_SYNC_RESET…

  • SNR of AD7768-1 with AD8250 at 48 kHz input frequency

    Hello,

    my customer asks for the SNR that is to be expected with the following signal chain:

    48 kHz input-signal ---> AD8250 ---> LTC6363 ----> AD7768-1

    AD8250 is powered by +/-15 Volt.
    The LTC6363 translates the up to +/-10V output from the AD8250…

  • PGA for AD7768-1

    Hello,

    I have to measure +/-10V single ended signals up to 200kHz with the AD7768-1 (24bit resolution, 512ksps).

    Now, my customer asks for a PGA with gain = 1, 2 and 4.

    Which signal conditoning solution do you suggest that maintains the noise and distortion…

  • Using a single Reference with multiple AD7768-1

    Hello,

    I have a design that will use up to 16 (sixteen) AD7768-1 delta-sigma ADC.

    Due to limited PCB area, I would like to use a single reference for all AD7768-1.

    According to the AD7768-1 data sheet, the AD7768-1 has fully buffered reference inputs…

  • AD7768-1 strange DOUT behavior

    We are doing a data acquisition system based on the AD7768-1 and I’m seeing some strange behavior of the DOUT (MISO) line, that ultimately results an incorrect data acquisition.

    In some cases the DOUT line resets too early, leaving a really small…

  • AD7768-1 analog input overvoltage protection?

    Hello,

    - does the AD7768-1 have internal ov-protection diodes between the AINs and AVDD1?
    - what is the maximum rating on the current handling of these diodes?

    - I want to have AVDD1 = UREF = 5V. Is this allowed? Does this degrade performance somewhat…

  • RE: How to measure a single-ended +/-10V signal with the AD7768-1?

    Hi Niels,

    Please see this post which has some relevant information. https://ez.analog.com/data_converters/precision_adcs/f/q-a/99753/ad7768-8-channel-adc-can-support-single-end---bipolar-input 

    I would suggest looking at the LTC6363 to drive the ADC…

  • RE: Ad7768-1 external component selection

    Hi 

    I hope you have checked this tool https://tools.analog.com/en/adcdriver/

    Select AD7768-1 and whatever front end you want and it can throw out a lot information, have a run thru and let me know if you need more info

    For the reference Filter the BW needs…

  • RE: Can we configure the AD7768-1 as an ADC with an adjustable sampling frequency?

    Hi,

    There are 4 MCLK divide options that can be set via SPI which will directly change the sampling rate. The question is, do you want to change the sampling rate or the output data rate? The AD7768-1 is a Sigma-Delta ADC which is over-sampled. 

    The output…

  • ad7768-1

    Hello,

    I want to use the AD7768-1 with 5V AVDD1 = Vref and 3,3V VDDIO.
    In demo-circuits the AVDD2 is connected to probably noisy VDDIO!
    Wouldn't it be better to supply AVDD2 from 5V over a R-C-Filter, that would lower the voltage to around 3V?

    Additionally…