[volt-nuts] bits beyond 24 from the ADC

David davidwhess at gmail.com
Sat Feb 2 13:33:19 EST 2013

The data sheets for the LTC2400 and LTC2440 are very specific that
offset and full-scale calibrations are performed on every conversion

On Sat, 2 Feb 2013 14:58:19 +0100, "Andreas Jahn"
<Andreas_-_Jahn at t-online.de> wrote:

>. . .
>To the 50 or 60 Hz output rate:
>The output rate is not necessarily equal to integration time.
>When I measure the input of a LT2400 with a oscilloscope,
>I see the swiching noise from sigma delta converter
>only the 2nd half 80 ms out of  160 ms output rate (configured for 50 Hz).
>The first half of the measurement time the input is passive.
>I guess that the LTC2400 does a kind of self-calibration every measurement 
>Otherwise he would not have the offset and gain drift specs.
>. . .

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