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Subject: Re: Resistive Ground

Date: 12/21/01 at 7:41 AM
Posted by: Hap
E-mail: hshipley@hst.nasa.gov
Message Posted:

In Reply to: Re: Resistive Ground posted by John Dunn - Consultant on 12/19/01 at 10:41 PM:

Most ADC have two seperated grounds, one analog, one digital, such as the MN99772E/B.
Here's another way of driving an ADC for long runs.
Using three op amps, one for the Analog data(before ADC),another amp drives the analog ground of the ADC, then feed both op amps outputs into another amp which connects to the analog input of the ADC. Do the normal null setup of amps. Can give ya nice readings from 20mv to 5.0v range in 20mv increments. No noisy grd problem.


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