• AD1939

    Q 

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

     

    A 

    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…