• AD9257 Clock Frequency Value and Data Clock Problem 

    Hi,

    I have a AD9257 for analog-digital conversion of my system. I have a clock frequency approiximately 8 MHz for AD9257.

    AD9257 fco pin works well at 8 MHz clock too. However, dco pin has some unstability at 8 MHz. Also, when I increase clock frequency…

  • RE: AD9252 vs. AD9257 on the same system board

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  • RE: AD9257 AGND circuit

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  • AD9257无法正常采集输出

    我正在使用FPGA采集AD9257,测试码0x2000是出来了,但是正常模式时偏移二进制模式一直输出0x2000或者补码一直输出0x0000。也就是说它一直转换出电压是0V,它要么没正常输出,要么没正常采集。

    板子上的差分输入电路可能是错的,所以我从评估板上把调制好的信号引入到我自己板子上的A通道上了。A通道的差分信号应该是对的。

    板子上的晶振差分出来的波形不是很好,就怀疑过是不是输入时钟的问题。所以我就直接用信号发生器,按照单端1.8 V CMOS输入时钟的接法,输入了一个40Mhz的正弦波…

  • AD9257没有办法正常工作,没有VREF和VCM

    使用AD9257时,按照参考电路设计了AD9257的全部电路,在测试时,进行过数字复位后,使用SPI可以读出正确完整的寄存器数据,并且测试码可以正确输出,但是在使用模拟端时,VCM为0V,VREF也为0V,另外,外部的PWDN不能控制ADC进行关断。请问ADC从测试码模式切换到模拟输入模式有什么需要配置的吗?或者内部需要激活一些什么?

  • RE: AD9257-40MSPS Test Pattern Issue

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  • RE: Question for your AD9257 drive

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  • RE: AD9257-ENOB and SNR not meet

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  • RE: Temperature drift of gain error for AD9257

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  • RE: Best way to filter AD9257 (A/D) input with ADA4932 driver?

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