With regarding to AD7783, how does it achieve 19.79 Hz throughput if its settling time is 101.08 ms, or I have misread the specs?
The settling time of the AD7783 is 2/fadc. This is the time required for the digital filter to settle. So, when the ADC is first powered up, the very first conversion will take 2/output data rate and all subsequent conversion will be available at the specified output data rate, fadc.
For a multiplexed analog input application, what is max rate of input switch can be achieved if the cs signal is kept low. How to achieve the max rate? Can the sampling/conversion and result reading be executed at the same time? Is there interference between them?
Principal Electrical Engineer
Hi, Ben Xu.
May I know what is your applications? How many analog input channels do you need? Are you intending to use an external multiplexer? What is your target throughput rate? AD7783 is a single channel only. However, you may want to consider using AD7124 which has all the building blocks of AD7783 along with more input channels and added more advanced features. AD7124-8 also uses a flexible cross point multiplexer, you can use any of the analog input pins AIN0 to AIN15 as positive or a negative inputs or as its alternative functions as stated on the datasheet. In a multiplexed system, the ADC is converting one channel at a time. These reduce the throughput time in multiplexed systems as it requires the digital filter to settle after switching from one channel to the next.
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