AD7176-2

Hi ,

 

I have planned to use AD7176-2 ADC in our project to read thermocouple, thermistor, RTD , Voltage , Current and strain gauge sensors. I am finding it hard to fix what is the conversion time and settling time.

 

I will be using one channel with output datarate @ 10ksps and Sinc5+sinc1 filter settings. In "Table 18. AD7176-2 Output Data Rate (ODR)". It mentions that @ 10KSPS Settling time is 100uSec. But it doesnt mentions about the conversion rate.

Please let us know what is Settling time? Is it applicable for ever conversion as I will be using external mux to provide input to the ADC and what is the conversion time. I have 16 channels to be converted.

Also I would like to know whether to use an continues conversion mode or single conversion mode. As the device is a battery operated I want an optimal solutions.

Regards,

ChiranjeeviM

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  • HI Chris,

    Thanks for the info.

    I have one doubt in continuation to your explanation. If I select 10kSPS data rate, then the ADC will have 100uSec settling time and 100uSec conversion time. Is my understanding correct?

     

    Also in our circuit, we have 16 Channels which are externally multiplexed (Analog Switch matrix) and fed to AD8231. Output of AD8231 is fed to AD8639 Opamp. Finally differential output of AD8639 is fed to AD7176-2.

    1. In this case pls clarify if there is any aliasing effect on the input of the ADC, since we are using external Mux.

    2. What will be the timing requirement to avoid aliasing between the channel switching?

    Regards,
    Chiranjeevi M

Reply
  • HI Chris,

    Thanks for the info.

    I have one doubt in continuation to your explanation. If I select 10kSPS data rate, then the ADC will have 100uSec settling time and 100uSec conversion time. Is my understanding correct?

     

    Also in our circuit, we have 16 Channels which are externally multiplexed (Analog Switch matrix) and fed to AD8231. Output of AD8231 is fed to AD8639 Opamp. Finally differential output of AD8639 is fed to AD7176-2.

    1. In this case pls clarify if there is any aliasing effect on the input of the ADC, since we are using external Mux.

    2. What will be the timing requirement to avoid aliasing between the channel switching?

    Regards,
    Chiranjeevi M

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