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Documents Q4. Will the same anti alias filter work for both voltage and current inputs of AD4111/AD4112?
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Table of Contents
  • +Documents
  • +General: FAQ
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  • +AD7091R Conversion Result Change
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  • -AD411x: FAQ
    • Q1. What is the difference between the AD4111/AD4112/AD4114/AD4115?
    • Q10. On the AD4111/AD4112/AD4114/AD4115 what’s the equivalent TUE (total uncompensated error) spec across different input voltage ranges for example ±10V, ±5V, ±2.5V or 0-10V, 0-5V, 0-2.5V?
    • Q11. What is the difference in output data rate between multiple channel configuration and single channel configurations for AD4111/AD4112/AD4114/AD4115?
    • Q12. What is the SPI mode of operation of the AD4111/AD4112/AD4114/AD4115, what polarity do I need to consider?
    • Q13. Where can I find a full and workable sample code for AD4111/AD4112/AD4114/AD4115 for a ST processor?
    • Q14. What is the recommended initialization and register configuration sequence for AD4111/AD4112/AD4114/AD4115?
    • Q15. How many data registers does the AD4111/AD4112/AD4114/AD4115 have to store conversion results for each channel?
    • Q16. What are the General Purpose Input voltage threshold for AD4114, AD4115?
    • Q2. On the AD4111/AD4112/AD4114/AD4115 can I detect if the input signals are floating due to faulty wiring?
    • Q3. What is the recommended anti-aliasing filter required for the AD4111/AD4112/AD4114/AD4115?
    • Q4. Will the same anti alias filter work for both voltage and current inputs of AD4111/AD4112?
    • Q5. Why are the onboard Analog input buffers not required for current measurements AD4111/AD4112?
    • Q6. Can the AD4111/AD41112 current channels accept a bipolar (±20mA) inputs?
    • Q7. What is the AD4111/AD41112 current channel's common-mode input?
    • Q8. Why are the Analog input buffers required for voltage measurements AD4111/AD4112/AD4114/AD4115?
    • Q9. What’s the equivalent input impedance for a pair of voltage input pins of AD4111/AD4112/AD4114/AD4115?
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Q4. Will the same anti alias filter work for both voltage and current inputs of AD4111/AD4112?

Figure 2. Antialiasing RC filter

The current inputs do not have any special considerations and thus can use the same anti-alias RC filter as voltage inputs, 4.7nF/180Ω. Just note that a 180 Ω resistor in series with 60 Ω impedance of the AD4111 /AD4112 current input results in a typical total input impedance of 250Ω.

Figure 3. Simplified Current input circuit

Tags: AD4111 RC filter anti current input alias voltage input ad4112 anti-alias rc Show More
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  • Q3. What is the recommended anti-aliasing filter required for the AD4111/AD4112/AD4114/AD4115?
    andreialejandro
    Q3. What is the recommended anti-aliasing filter required for the AD4111/AD4112/AD4114/AD4115? For the AD4111/ AD4112/AD4114/AD4115 the recommend anti-aliasing is 4.7nF/180Ω as this combination will...
  • RE: AD7719 anti-alias filter requirements
    SimonNovak
    I recommend implementing simple RC anti-alias filters on the analog inputs, especially if your application is sensitive to high-frequency noise. This will provide an extra layer of protection and ensure...
  • AD7719 anti-alias filter requirements
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    Hi, Most datasheets for Sigma-Delta ADCs recommend the use of a simple RC anti-alias filter on the analogue inputs. However the datasheet for the AD7719 makes no such recommendation. I can only find...
 
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  • Q3. What is the recommended anti-aliasing filter required for the AD4111/AD4112/AD4114/AD4115?
    andreialejandro
    Q3. What is the recommended anti-aliasing filter required for the AD4111/AD4112/AD4114/AD4115? For the AD4111/ AD4112/AD4114/AD4115 the recommend anti-aliasing is 4.7nF/180Ω as this combination will...
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    I recommend implementing simple RC anti-alias filters on the analog inputs, especially if your application is sensitive to high-frequency noise. This will provide an extra layer of protection and ensure...
  • AD7719 anti-alias filter requirements
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    Hi, Most datasheets for Sigma-Delta ADCs recommend the use of a simple RC anti-alias filter on the analogue inputs. However the datasheet for the AD7719 makes no such recommendation. I can only find...
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