[volt-nuts] ***SPAM*** Re: Some questions to zeners (1N823-1N829)

Andy Bardagjy andybardagjy at gmail.com
Tue Jan 29 12:31:17 EST 2013


The ADS1282 is a really cool part! After studying the ADS1282
datasheet is appears that *at best* it can achieve 130dB SNR which, by
my calculations is effectively 21.3 bits - by the formula
SNR=(6.02N+1.786)dB.

This got me thinking, are there any higher performing "24 bit" ADCs we
should look at for our "nuttery". One that I found is the Linear
LTC2440 (and others in the family). It claims, at its highest
resolution, 24.6 effective bits. That said, I am having trouble
comparing SNR directly. I need to read more to understand how to
convert its noise spec - 200nV RMS noise - to a SNR dB figure.

Andy Bardagjy
bardagjy.com


On Tue, Jan 29, 2013 at 4:43 AM, Тимофеев Михаил <timka2k at yandex.ru> wrote:
> The ADS1282 offers outstanding specification, but not very useful in the wide-scale DVM application range due to low input and reference voltages.
> Within a year I'm trying to develop a design of the selfcal 7.5-digits DMM with ADS1282 ADC. Reference (+/- 10V) is a aged 1N829A with 0.03ppm noise and 2nd order TC correction, downscaled to +/-2.5 V with zero TC divider.
>
> Mickle T.
>
>
> 29.01.2013, 11:38, "Poul-Henning Kamp" <phk at phk.freebsd.dk>:
>> Content-Type: text/plain; charset=ISO-8859-1
>> --------
>> In message <AA473A4936944A1199FC6F4C9C5D9A1A at laptop>, "Andreas Jahn" writes:
>>
>> Amazing!
>>
>> Recently I came across a very interesting ADC from TI, designed for
>> use with geophones: ADS1282
>>
>> It might be interesting for volt-nuttery:  It samples 2 bits at
>> 4MHz, which are then downsampled to 31 bits at 4kHz or less.  For
>> this reason it is incredibly linear and has very good S/N.
>>
>> --
>> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
>> phk at FreeBSD.ORG         | TCP/IP since RFC 956
>> FreeBSD committer       | BSD since 4.3-tahoe
>> Never attribute to malice what can adequately be explained by incompetence.
>> _______________________________________________
>> volt-nuts mailing list -- volt-nuts at febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
>> and follow the instructions there.
> _______________________________________________
> volt-nuts mailing list -- volt-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts
> and follow the instructions there.


More information about the volt-nuts mailing list