Power supplies for Apollo2

Comments

1 comment

  • Andre Belanger

    For both Apollo1 and Apollo2, all of the external VDD rails must be the same voltage.  For Apollo2 this means VDD = VDDP = VDDA = VDDH.

    For Apollo1, the maximum ADC input voltage is determined by the VDDA supply voltage (which must be same as other VDD supplies).

    For Apollo2, the maximum ADC input voltage is determined by the separate ADC_VREF voltage.  The Apollo2 ADC Vref is restricted to either 2.0V or 1.5V.  This voltage can be either externally provided to the ADC_VREF pin, or the ADC Vref voltage can be internally generated at either 1.5V or 2.0V (configurable).  If using the internally generated Vref, then a 470nF capacitor must be connected to the ADC_VREF pin.  

     

     

    0
    Comment actions Permalink

Please sign in to leave a comment.