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ADS8317: Non-volatile memory

Part Number: ADS8317


I have a customer using ADS8317 in their products.
Waveform jumps when output code is near zero.

I found the following description.

Differential linearity for the ADS8317 is factory-adjusted via a package-level trim procedure.
The state of the trim elements is stored in non-volatile memory and is continuously updated
after each acquisition cycle, just prior to the start of the successive approximation operation.

Is there a possibility that the adjustment value of the internal non-volatile memory is erased
or changed?
For example, is it caused by the following?
・Logical sequence
・Logical interface
・Power  sequence
・Signal level

Best regards,

  • Hi Seishin,

    Could you please share the complete ADS8317 schematic, including the front end driver amplifier and RC filter, reference driver circuit, supply circuitry connections including the bypass capacitors?

    The reason I ask for the schematic is that the device is a SAR ADC, where the internal sample-and-hold capacitor needs to be driven to the target voltage within the acquisition period. The driver amplifier and RC filter must be carefully design and have enough bandwidth and/or low output impedance to completely re-charge and settle during the acquisition period. The inputs on a SAR ADC are are not high-impedance and there is an amount of charge kickback expected as the S/H (sample-and-hold) switches.  It is possible that the device is going through a significant code transition at this voltage level, and therefore charge kickback occurs.  If the driving amplifier does not have enough bandwidth to recharge and settle the sample-and-hold, this could potentially show as the behavior shown above.

    Thank you and Best Regards,

    Luis Chioye

    SAR ADC Applications

  • Dear Luis,

    Thank you for your response.

    I have attached the ADS8317 schematic.


    Best regards,

  • Hi Seishin,

    I will be contacting you directly via email.

    Thank you,

    Kind Regards,
  • Hello Luis,

    I have just sent you an email.Could you please check it.

    Best regards,
  • Hi Seichin,

    Yes, this communication/query is being addressed directly via email

    Thank you and Best Regards,