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ADS8519: Power up sequence

Takashi Yamaguchi
Genius 12740 points
Part Number: ADS8519

Hi team,

My customer is considering to use the ADS8519. Could you support the following question from the customer?

ADS8519 has 5V analog power supply(VANA), power supply for I/O(VDIG),  and Vref. Are there power up sequence among them?

Regards,

Yamaguchi

  • 0
    TI__Mastermind 41785 points

    Hi Yamaguchi,

    There is no specific sequencing required for the power supplies on this device. However, there are Absolute Maximum Ratings required for analog inputs and digital inputs, so it's a good practice to make sure VDIG is powered up before the digital inputs are available and VANA is powered up before the analog input are available.

    ADS8519 has switched-capacitor input structure and the input impedance is not high, so it's critical to design a proper driving circuit including amplifier to drive this ADC.

    However, ADS8681 is 16-bit, 1Msps single channel SAR ADC with programmable input ranges(+/-12V,+/-10V,+/-6V,+/-5V,+/-2.5V) on a single +5V supply, it has an integrated analog front-end (AFE) including PGA and ADC driver, so the requirement of designing an external driving amplifier circuit can be eliminated in most applications, also a precision voltage reference is integrated. A pin-pin compatible 18-bit ADC ADS8691 is available as well. 

    Regards,

    Dale