• 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…
  • AD1939 PLL LOCK

    你好,

    AD1939外置连接了12288MHz晶振,通过SPI读写AD1939寄存器正常,但设置完读 PLL and Clock Control 1 Register 的 PLL lock indicator (read only)位,一直为 Not locked。请问什么原因?

  • AD1939 CCES Examples?

    Hi folks, I am about to start with the AD1939 on the 21489 EZ Kit. I would like to try creating a simple audio passthrough: input data to the 21489, and then back to the AD1939 output without modification.

    I have found some stuff to work with in the…

  • 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?

  • AD1939 PLL unlocked?

    hi,

    I used the DEMO of  "21489 AD1939 I2S C Sampled-Based Talkthru", but PLL lock indicator in PLL and Clock Control 1 Register is always UNLOCKED ?  get stuck in an infinite loop, marked in red .


    at the same time, SPI is ok, it can write…

  • AD1939 - Clocks questions

    Hello,

    I'am using an AD1939 codec and I have a crystal on my board which generates 12,288 MHz (256 x Fs in my case, since I'll use only 48 kHz as a sample rate) and this crystal is connected to the MCLKI/XI pin of the AD1939.

    All the systems…

  • AD1939 - Clocks questions

    Hello,

    I'am using an AD1939 codec and I have a crystal on my board which generates 12,288 MHz (256 x Fs in my case, since I'll use only 48 kHz as a sample rate) and this crystal is connected to the MCLKI/XI pin of the AD1939.

    All the systems…

  • AD1939采样率设置

    您好!

    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 in selfboot system

    Hi!

    I have a SW/HW question about programming the AD1939 CODEC in a Selfboot ADAU1446 DSP-System. My board works well with the ADAU1446 in I2C Mode, with selfboot from EEPROM (I2C) and with the AD1939 in Standalone mode. Now I need to program the CODEC…

  • AD1939 DAC output impedance

    Hello there,

    I am using the AD1939 to drive a differential buffer and would like to know what is the output impedance of the AD1939 in order to adjust my resistors properly. I tried the datasheet but this information is missing.

    Thank you,

    Fernando…