• 关于AD7988-5的采样问题

    我使用的是ti的dsp2812的spi连接AD7988-5,一切都工作的很好,但是波形总是出现一点相位失真,例如测试3000Hz正弦波会出现几个Hz的频率错误,AD7988-5的输入端是测试的信号,已经确认过输入没有频率错误,但是到dsp端的采样序列就出现了频率错误,会是dsp的spi时钟抖动或者其他问题吗?有碰到过同样问题的同志吗?有没有什么解决方案。采样频率8k,spi驱动。

  • 急等:AD7988-5和AD5543的问题

    AD7988-5,REF:5V,VDD:2.5V,VIO:5V,CS模式三线式,SDI=1,每次读数都0x8000,为什么?

    AD5543,REF:5V,电流输出输出1mA接2.5K阻值的线圈,为什么达不到1mA,只用0.3mA?

  • AD7988-5怎么好像不工作的样子?

    各位大侠,您们好!

          我使用了AD7988-5进行采样,感觉很简单的事情,碰到了问题。我采用了3线SPI方式,FPGA驱动,

    CVT  CLK 波形正常,怎么SDO上面好像没有数据啊?到底怎么回事情?能给予指教下么?

          原理图如下:

          FPGA   signalTap 波形如下:

  • AD7988-5・SDO high impedance period

    Hello,

    Is the time during which the SDO of AD7988-5 is in high impedance specified?

    Is it equal to tCNVH? or tCONV
    ? or tCNVH+tEN?

    Regards,

  • AD7988-5读出数据不正确

    delay_us(20);

      SPI1_NSS_H;//上升沿开启转换  转换时间 9.5us

      delay_us(1000);

        SPI1_NSS_L;

        for(clk_n=0;clk_n<16;clk_n++)

        {

            adc_value=adc_value<<1;

            SPI1_SCK_L;

            SPI1_delay;

            if(Read_SPI1()) adc_value|=0x01;

            else ;

            SPI1_SCK_H;

            SPI1_delay;

  • 关于AD7988-5  DC & AC performance test

    求教:刚买了 16bit ADC AD7988-5 demo EVB,配合SDP控制板,和分析软件。

    信号源是由函数发生器AWG420产生,DC测试时,Ain为10Hz三角波,AC时为sine 10KHz,但是量测结果较差,SNR只有74dB,noise floor较高。怀疑是信号源不能满足测试需求,那请教该如何正确测量16bit ADC DC&AC performance?

  • SHARC 2147x. Simultaneously Sampling 6 xx AD7988-5 via 6xx SPORT Interfaces

    Hello,

     

    Is it possible to simultaneously sample 6 xx AD7988-5 AT 500 KSPS via 6xx SPORT Interfaces of an SHARC 2147x?

     

    Can a Frame Sync (and possible a Clock) be shared by 6xx SPORT Ports?  The Frame Sync would generate the CNV pulse that would…

  • AD7988-1: FAQs

    For pseudo-differential input applications of the AD7988-1, or AD7988-5, can
    the IN- be connected to a voltage other than GND?

     

    The IN- can be connected to max input voltage of -0.1V to +0.1V.

  • AD7988 SDO Voltage Level

    I develop an application where I use a AD7988-5 with an interface to the processor with 5V signals.

    Ref=5V

    VDD=2.5V

    VIO=5V (For the 5V interface)

    But now I measure:

    that the SDO high level is only at 2.5V.

    In the…

  • AD7988-x: ADC input exceed Vref or GND

    Can the ADC inputs of AD7988-1 or AD7988-5 exceed the reference voltage or go
    below ground?

     

    The ADC inputs should not exceed the reference or go below ground by more than
    0.3V as this may result in the ADC being damaged. If this is…