• About the problems of output exception after knocking on AD9957. How CCI filter works in AD9957.

    Is CCI filter in AD9957 similar withe the general form of a cascade? Does it only use the adder and negated device? Then what is the position of overflow when the overflow indication of CCI is high at the pin 20 , and after overflow what  is CCI filter…

  • AD9957

    用时钟分配器CDCE913给AD9957提供时钟,时钟电路参照评估板电路,用频谱仪测得AD9957输入的时钟频谱有高次谐波,其中奇数次谐波功率较大,基本上和主频一样。请问,这样的情况正确吗?该怎么解决?同时,使用内部锁相环,一直无法锁定,是否会和这个问题有关?

  • RE: AD9957 spurious output

    Hi Claudio,

    In order to assist you further, kindly provide the register settings of the AD9957.

    Best regards,

    Mark

  • AD9957+ADL5801

    AD9957评估板输出的中频模拟信号是否可以直接和ADL5801进行无缝连接,需要进行阻抗匹配吗?AD9957的输出阻抗是多少?

    谢谢!

  • AD9957 PDCLK

    AD9957的datasheet对于寄存器CFR2的PDCLK反转位描述如下:

    请问正常极性下,假如PDCLK配置为正常极性,即上升沿接收数据,那么数据手册是说在TxEnable由低变高之后,PDCLK的第一个上升沿接收的是Q数据吗?

  • AD9957

    Dear Sir,

    I am trying to interface AD9957 with Arduino Due. I am able to send data using SPI but it is not received by the registers mentioned in the evaluation software as I tried to read it from the registers. Being fresher I am not to figure out,…

  • AD9957 Matlab Model ?

    Is there a Matlab model of the AD9957 component (with filter taps and bit rounding operations in each stage) ?
    The link provided in a previous answer on this subject is no longer valid.

    Emmanuel

  • AD9957 PLL_Loop_Filter Connection

    HI,

    Please advise on AD9957 PLL_LOOP_FILTER (PIN2) connection. if I am using an external differential REF_CLK source, do I leave the PLL_LOOP_FILTER pin open/NC? How about the PLL_LOCK pin?

    Also, I intend to use the ADF4360-7 as the REF_CLK synthesizer…

  • AD9957 PLL question

    In the datasheet for the AD9957 on page 35 it refers to a frequency multiplication factor of 12 to 127, is this the same as N called out in the equations on page 36?

  • AD9957 spectral invert

    AD9957 works in QDUC mode with 5 MHz modulation rate.

    CFR1 = 00 20 00 02

    CFR2 = 00 40 E8 00

    CFR3 = 35 38 C1 28

    PROF0 = C9 FA 00 00 1C 2F 83 7B

    Input frequency (clk) = 50 MHz

    Output frequency = 110.1 MHz

    Pins 52, 53, 54 are electrically grounded…