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ADS1278-EP: Start-up sequence

Art Mecina
Genius 16655 points
Part Number: ADS1278-EP

Hello Guys,

Good day.

Figure 81 on page 35 of the datasheet shows the start-up sequence. This is not internal to the device right and must be set-up programmatically? How do I make sure I have set it up properly?

Thanks in advance!

Art

  • 0
    TI__Mastermind 46380 points

    Hello Art,

    The Start-up sequence shown in Figure 81 is required to ensure the internal power-on reset circuit works correctly.  If you do not meet this requirement, the part will still function  correctly if you assert the /SYNC pin after the supplies have ramped up to within recommended voltage ranges and after data first appear, indicated by /DRDY transitioning from high to low.

    The evaluation board does not always meet this power-up sequence, and pulses the /SYNC pin to ensure proper operation.

    If you want to meet these requirements, most LDO's have an enable pin that can be controlled by a power-up sequence IC or simply use RC's to set different time delays, meeting the staggered power-up sequence.  

    Most designs do not meet the start-up sequence requirements and simply rely on assertion of /SYNC  pin for proper operation.

    Regards,
    Keith Nicholas
    Precision ADC Applications