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ADS1120: internal oscillator accuracy after solder heat

Part Number: ADS1120
Other Parts Discussed in Thread: REF5025, LMK61E07

Hi Team,

I have a question about ADS1120 internal oscillator accuracy after solder heat.

ADS1120 datasheet says internal oscillator accuracy is ±2%.
this is chip level electrical Characteristics so after we do soldering, this parapeter might shift a little bit.

Do you have any data that shows internal oscillator accuracy of post-soldering?


In REF5025 datasheet, there is "Parameter Measurement Information" in page 13.
This shows solder heat shift so I'd like to know similar information about internal oscillator accuracy of ADS1120.

or LMK61E07 datasheet shows Total frequency tolerance and that test condition says "All frequency bands and device junction temperature up to 115°C; includes initial freq tolerance, temperature & supply voltage variation, solder reflow, and 5 year aging at 40°C ambient temperature".
if ADS1120 interenal oscillator accuracy inclues solder reflow, we can say ADS1120 internal oscillator accuracy is ±2% after solder heat.


In addition, we focus on internal oscillator accuracy but are there any other parameter that is affect by after solder heat?
e.g.) INL, offset drift, offset error someting like that.

Regards,
Kai

  • Hi Kai,

    Device characterization was accomplished soldering the components to coupon boards and then characterized.  As far as the accuracy of the internal oscillator, the devices you reference in your comparison are much higher levels of precision than the ADS1120.  The concern of the oscillator is primarily with respect to the FIR filter used for 50 and/or 60Hz notches.  If a high degree of the oscillator stability is required then I would suggest using a low jitter external clock source.

    Best regards,

    Bob B