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ADS1283: No INL specification in datasheet

Josh Heiner
Intellectual 860 points
Part Number: ADS1283
Other Parts Discussed in Thread: ADS1284, , ADS1282, ADS1281

Hi,


I've been trying to compare the parts in the ADS128x family.  The performance specifications across the four parts appear to be very closely matched, but I can't find an INL spec for the ADS1283 (also true of the ADS1284).  The ADS1281 gives a figure of .6ppm, and the ADS1282 gives a figure of .5ppm.  I presume the ADS1283 and ADS1284 offer similar levels of performance, but I'd be more comfortable if I had a real numbers from TI rather than my own hopeful assumptions.

Thanks,

Josh

  • 0
    TI__Mastermind 44640 points

    Hi Josh,

    I looked to see if we had any INL data for ADS1283 and ADS1284, but it looks like we stopped characterizing the INL on the ADS128x family after the ADS1282. INL and THD tend to correlate fairly well so I would also assume a similar INL performance level between devices since the THD values are nearly identical. Unfortunately, I don't have any INL data to pull from to provide any additional evidence to back up my claim.

    Regarding other differences between these devices and reasons for choosing one of the other...

    • The ADS1283 and ADS1284 - are our best performing devices in the family with the highest SNR. They come in a smaller package and have lower power consumption than the ADS1282. They also have a /CS pin, which makes it easier to interface to multiple ADCs on the same SPI bus. The ADS1284 has an optional lower power operation mode, otherwise it is very similar to the ADS1283.

    • The analog inputs on the ADS1281 go directly into the delta-sigma modulator (it does not have an integrated MUX or PGA). It also has a simplified "pin mode" option, allowing you to configure the device via GPIO pin levels instead of writing to device registers. However, unless you are connecting to a buffered sensor, or plan to design your own analog signal conditioning circuitry; I would recommend going with one of the other devices in the family since it is very difficult to find a discrete amplifier with a flat noise density that is comparable to the noise level of the integrated PGA [~ 5nVrms/sqrt(Hz)].

    I hope that helps! 

  • 0 in reply to Christopher Hall
    Intellectual 860 points

    Thanks Christopher!  That is indeed helpful, and I feel like I now have the confidence I need to go with the ADS1283.

    Josh