• AD1939

    Please clarify how the AD1939 decides between Standalone and SPI mode.


    As described in the Serial Control Port section on page 14 of the datasheet,
    powering up the AD1939 in Stand Alone mode puts the part in default mode with
    the exception of…

  • AD1939 RESET pin

    Hi there,

    I'm trying to work out the best way to wire the PD/RST pin of the AD1939 in a new design.  Am I supposed to have a switch connected to this pin to activate resets?  How do I create this circuit to the RST pin?  Or do I simply pull it to ground…

  • AD1939: datasheet contradictions on SPI timing specification

    AD1939 datasheet, rev D, Figure 11 shows tCLH from clock rising edge to Latch
    rising edge. On the otherhand, this timing specification (i.e. tCLH) in the
    table on page 7 reads: tCLH from CCLK Falling.
    Can you confirm which is correct?



  • AD1939 bit shift problem

    Hello all,

    I have a question about the AD1939.

    We connected the AD1939 to a microcontroller. Normally it's working all fine but sometimes (ca. 1 of out of 10 resets), we have a bitshift in our Audio data of always one bit. When reading back the registers…

  • RE: migrating from AD1836 to AD1939 with BF533

    Modified your code, and got it work . 

    Command 9 is read, and 8 is write.  Please change command 9 to 8, and have a try.

    Another thing is the our CS signal is connected to PF0, we have to use it as GPIO.

    Good luck.. 

  • AD1939采样率设置


    我现在使用的是ADSP21489核心板+AD1939音频芯片。官网介绍AD1939支持8 kHz至192 kHz采样率,但是我在ad939.h的头文件中只看到三种预设的采样率,分别是48 kHz, 96 kHz,192 kHz,定义如下:

    // ADC Control 0 Register
    #define ADC_SR_48K (0x00)
    #define ADC_SR_96K (0x40)
    #define ADC_SR_192K (0x80)

    请问一下,如何改变采样率,我现在需要8 kHz采样率…

  • AD1939 DAC outputs

    Our system uses SC582 interfaced to multiple AD1939. I cannot generate sinusoidal output on the DAC. I see only square wave output. I know this is very vague, but begin the conversation somewhere, right?

  • RE: AD1939 ADC Protection, Clocks, Unused Pins


    Apologies for missing this item. I am not sure if it still relevant to you that this question will be answered, However, we are clearing up some open items in our community and ensure that any query is located on its proper community as others who have…

  • AD1939 Failing to Verify PLL Lock ADSP-21489

    Hi, I am working on an audio design using the AD1939 codec alongside Sharc ADSP-21489. The design is largely based on the audio features present in the ADSP-21489 ez-kit, as are the schematic and layout.

    I am running a test program based on the code from the…