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PCM5122: PCM5122 硬件配置问题

Part Number: PCM5122

使用PCM5122做DAC转换时,DVDD IO电源域配成了3.3V,但I2S信号输入的电平是1.8V,按规格书描述VIH最小是0.7VDD,实际上使用没出现问题,请问这个设计合理吗

如果DVDD配成1.8V时,那PCM5122的I2S ,i2C和mode 模式配置的那些IO口的电源域是不是也变成了1.8V。

  • 已经收到了您的案例,调查需要些时间,感谢您的耐心等待。

  • 参照器件内部的配电,您可以看到内部数字内核以1.8V的电压运行(通过内部1.8V LDO或直接连接1.8V电源)。 但是,数字信号的输入电平必须与DVDD for IO部分匹配。

    在数据表中,读到:"DVDD is used to set the I/O voltage, and to be used as the input to the onchip LDO that creates the 1.8 V required by the digital core. For systems that require 3.3-V I/O support, but lower power consumption, DVDD should be connected to 3.3 V and LDOO can be connected to an external 1.8-V source. Doing so will disable the onchip LDO. When setting I/O voltage to be 1.8 V, both DVDD and LDOO must be provided with an external 1.8-V supply."

    如果DVDD连接至1.8V,则PCM5122的I2S,I2C和模式IO端口的功率域也为1.8V。 

    有一个有关电压电平转换器的应用说明,您可能会发现它在某个时刻很有用。 

    https://www.ti.com/lit/ml/scyb030/scyb030.pdf?ts=1752247974773&ref_url=https%253A%252F%252Fwww.google.com%252F