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Results on Analog.com

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  1. AD421
    Production
    Product
    4-20mA Current Loop D/A Converters
    Loop-Powered 4-20 mA DAC
    AD421

    PDF

    Datasheet

    Documentation

    Ask the Community

    Sample & Buy

    Sample & Buy

  2. AD421: Loop-Powered 4-20 mA DAC Data Sheet
    Data Sheet

    PDF

    171 kB

  3. AD621
    Production
    Product
    Instrumentation Amplifiers
    Low Drift, Low Power Instrumentation Amp with fixed gains of 10 and 100
    AD621

    PDF

    Datasheet

    Documentation

    Ask the Community

    Sample & Buy

    Sample & Buy

  4. AD621: Low Drift, Low Power Instrumentation Amp with fixed gains of 10 and 100 Data Sheet
    Data Sheet

    PDF

    522 kB

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Results on EngineerZone

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    1. AD421BRZ

      Forum Thread
      Answered
      Precision DACs
      13 December, 2017
      AD421BRZ : Worse case power dissipation (Pd) & Thermal resistance θjc (Junction to Case) required.

    2. RE: AD421BRZ

      Forum Reply
      Precision DACs
      23 January, 2018
      Hi CAnandhi, Apologies for the delay. We initially didn't have the data for the thetaJC and I had to request for it to be simulated. thetaJC = 30degC/W Best regards, Rainier

    3. RE: AD421BRZ

      Forum Reply
      Precision DACs
      18 December, 2017
      Hi CAnandhi, The absolute maximum rating for power dissipation(Pd) is 450mW. I'm still looking for the junction to case thermal impedance (thetaJC), I'll keep you posted once I get any information. Best regards, Rainier

    4. RE: AD421BRZ

      Forum Reply
      Precision DACs
      15 December, 2017
      Hi, Someone is looking into this thread and will reply to you once we have an answer. Thanks. Cheers, Ivan

    5. Can the AD421 function correctly with standard SPI

      Forum Thread
      Answered
      Precision DACs
      08 September, 2017
      1) It appears the AD421BRZ actually has a problem if the MOSI line is not brought LOW after every transmission. This means it can be used with standard SPI, since this is not the case. SPI leaves the MOSI bit HIGH if the last bit was “1”, and it leaves …
      4-20mA Current Loop D/A ConvertersPrecision D/A Convertersad421

    6. Alternative FET recommendation for AD421

      Docs & FAQs
      Precision DACs
      QuestionI am using AD421BR on our transmitters as 4/20mA output IC. As stated in the AD421 datasheet; The DN25D FET transistor from Supertex1 meets all requirements for the FET. Other suitable FETs include ND2020L and ND2410L, both from Siliconix. These FET devices are all obsolete. Can you suggest a …
      3BMR5527precision dacsad421

    7. AD241 problem setting current

      Forum Thread
      Answered
      Precision DACs
      17 June, 2020
      I am using AD421BRZRL. My circuit is the one attached in the image. If I set LATCH low, the voltage at Rs is 0.88 V -> 4 mA. If LATCH is high, voltage at Rs = 1.98 V -> 9 mA. This behavior is independent of the values I set in …
      4-20mA Current Loop D/A Convertersdac ad421Precision D/A ConvertersAD241ad421dac

    8. Worse case power dissipation (Pd) & Thermal resistance θjc (Junction to Case)

      Forum Thread
      Answered
      Operational Amplifiers
      13 December, 2017
      Required Worse case power dissipation (Pd) & Thermal resistance θjc (Junction to Case) of the following part numbers. ADA4051-2ARMZ-R7 AD421BRZ

    9. RE: Worse case power dissipation (Pd) & Thermal resistance θjc (Junction to Case)

      Forum Reply
      Operational Amplifiers
      27 December, 2017
      … The theta-jc of RM-8 is 62.15 C/W. If you want to know more about power dissipation of a device this Technical Article can help you. You can post a forum on precision DACs community about AD421BRZ, someone should be able to help you there. Regards,Goz

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