• ad9251

     I bough a HSC-ADC-EVALCZ capture  board  plus a AD9251 EVL. I wonder whether the start sampling signal is told to AD9251 through SPI? I need to output this signal through J5 and J7 simultaneously.

  • AD9251 output_adjust


    I copied and pasted part of register map from AD9251 datasheet.

    Could you explain more about drive strength and stripe?

    How does an output congiured witn bigger stripes work?

    Best Regards,


  • AD9251 Common Mode Voltage


    AD9251 VCM voltage in my circuit is set to the 1.2V instead of 0.9V. In datasheet it is advised to set VCM to AVDD/2 which is 1.8V/2 in my case. I used "differential double balun input configuration" (Figure 44 in AD9251 datasheet rev.B) in my…

  • How to configure the AD9251 by SPI bus to use the mux output on portA?


    I am using the AD9251-20, we use the SPI configure as below:

    TYPE ADDR_matrix_index is array (0 to 11) of std_logic_vector(15 downto 0); 
    signal W_ADDR_Var : ADDR_matrix_index;
    constant W_ADDR : ADDR_matrix_index:=( x"0000", x"0005", x"00ff", x"000b…

  • AD9251 configuration without SPI

    Dear Sir/Madam:

    We are designing ADC using dual ADC AD9251 part.  We configured this AD9251 using fixed internal reference (Vref = 1.0V).

    The question we have is that if we want to configure AD9251 without SPI, we can do the following:

    CSB <-> AVDD…

  • AD9251 interleaved output mode


    Please help me!

    I want to set AD9251 to interleaved output mode. all I need to do is set bit 5 of register "Output mode" (0x14)?

  • AD9251 inleaved output mode


    Please help me.

    I have some question about interleaved output mode.

    1. To enable output mux, all I need to do is set bit 5 of register "Output mode" (0x14)?

    2. Once the output mux of AD9251 is enabled, the two digital output (A/B…

  • AD9251 communication with Stm32746

    Hi all,

    Anyone know how to connect AD9251 with Stm32F746g using CubeMX via SPI?

    void SystemClock_Config(void);
    static void MX_GPIO_Init(void);
    static void MX_SPI5_Init(void);

    hspi5.Instance = SPI5;
    hspi5.Init.Mode = SPI_MODE_MASTER;

  • AD9251 DCOA/B with Interleaved Outputs

    When running the AD9251 with interleaved output data multiplexed onto a single bus, the respective A channel or B channel data is output for only ½ the clock period. 

    In this case, should we expect to see a rising edge on DCOA to indicate valid Channel…

  • AD9251 Evaluation: the minimum signal frequency

    I bought a HSC-ADC-EVALCZ capture board plus a AD9251 EVL. In my project, the signal frequency which need to be sampled is below 30KHz.

    Now, I have a problem. It is found that the signal frequency below 76KHz could not be sampled accurately; I have…