• Power control of DAC(AD9787)

    My customer is trying to prevent abnormal signal output in DAC analog output when DAC is abnormal conditions such as power-up or non-configured.
    So, She plans to separately control digital and analog power supply of DAC as below.

    Step 1. Digital power…

  • 关于数模转换芯片AD9787里面的正交调制器中的NCO

    I路信号和Q路信号都是十进制1000(1000输出的正弦波和余弦波峰峰值是200mv),速率是50M,经过内插后变成200M,DAC的采样速率也是200M,我就是想输出NCO中的余弦波和正弦波(频率设为15M),可是输出的不是很理想,大致是余弦波和正弦波的样子,但是波形极不平滑,而且在最高峰和最低峰处杂波特别多,请相关技术人员解答一下,是因为我设置寄存器不对还是AD9787里面NCO输出的正弦波和余弦波就是这个样子的?如果是这样的话我上变频就不好了

  • RE: AD9788-DPG2-EBZ板卡的PC驱动问题

    相关的评估板资料,参考如下链接

    https://wiki.analog.com/resources/fpga/xilinx/interposer/ad9787?s[]=ad9788

    https://wiki.analog.com/resources/eval/dpg/eval-ad978x?s[]=ad9788

  • IF Frequency Of QPSK Modulator

    We are implementing direct qpsk modulator in fpga. Our data rate is 60 Mbit per sec . In digital , we must make I=I(0)*Sin(2*pi*f*t) and Q=Q(0)*Cos(2*pi*f*t). (f is frequency)

    Our question is that what is the value of f ? 

    2. If we want to inteface fpga…

  • RE: AD9788SPI通讯无应答

    IO电压满足CMOS要求

    芯片手册:

    All data input is registered on the rising edge of SCLK. All data

    is driven out of the AD9785/AD9787/AD9788 on the falling

    edge of SCLK.

    数据在SCLK上升沿寄存,在下降沿改变,应该也没问题

  • HMC1056 IQ Modulator

    We are planning to use ADI TxDAC part: AD9787 (14-Bit DAC) for our data-rate requirement with your I/Q mixer: HMC1056LP4BE as I/Q modulator. The DAC can support the load resistance from 25 to 50Ohms whereas I/Q mixer: HMC1056LP4BE I/Q ports (IF1 & IF2…

  • RE: HMC1056 I/Q mixer as QPSK modulator with TxDAC

    We are planning to use ADI TxDAC part: AD9787 (14-Bit DAC) for our data-rate requirement with your I/Q mixer: HMC1056LP4BE as I/Q modulator. The DAC can support the load resistance from 25 to 50Ohms whereas I/Q mixer: HMC1056LP4BE I/Q ports (IF1 & IF2)…

  • AD9788: SYNC pins

    As far as I understand, the SYNC pins are used only when multiple DACs needs to be synchronized. For an application having a single DAC, can the SYNC pins be kept floating?