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oscillator Duty Cycle change for the ADS1251 A/D Converter.

Stephen Petraglia
Prodigy 10 points
Other Parts Discussed in Thread: ADS1251

I am presently using the ADS1251 A/D converter in one of my products. The oscillator I am presently using is going obsolete.  The current occillator has a duty cycle of 45 - 55% the replacement has a duty cycle of 40-60%. Will this effect the A/D performance, i.e. accuracy, linearity, noise, etc

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    TI__Mastermind 44680 points

    Hi Stephan,

    I don't think changing the duty cycle should have much if any effect on performance, so long as it is within an acceptable range...though there is no specification for the duty cycle on the ADS1251, similar devices are usually specified with a duty cycle between 30-70%.

    Usually the effects of clock jitter are considered more often, as clock jitter affects the timing of when the input signal gets sampled. However, delta-sigma ADCs are more immune to the effects of clock jitter because the input signal is usually low frequency and over-sampled (averaged). ...Think of a sine wave that gets sampled at some time t +/- dt. The higher in frequency of the input signal gets, the more its voltage is able to vary in the small "dt" time...Though, with the ADS1251 and a data rate of 20kSPS or less, I would not be worried about this effect.

    Best Regards,
    Chris