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ISO122: ISO122JU

Pierre LORENZON
Prodigy 10 points
Part Number: ISO122
Other Parts Discussed in Thread: ISO224

Hello,

I have 2 versions of ISO 122 datasheets:

- November 1993 version. 

-Revised January 2015 version.

Each version haves differences :

- OUTPUT FILTER (November 1993 version - Lowpass, Sallen Key, inverted) (Revised January 2015 version - Lowpass, Sallen Key, Butterworth)

- Power Supply Recommendation (November 1993 version - Lowpass, Pi Filter) (Revised January 2015 version - Capacitor).

Why these parameters were change?

What is the most efficient assembly?

Thanks for your help.

Sincerely,

  • 0
    TI__Guru**** 168435 points
    Hi Pierre!

    Welcome to our E2E forum and thank you for the interest in our ISO122! The ISO122 was developed by the Burr-Brown Corporation nearly 25 years ago and it's still quite a popular part. That is the main reason for updating the datasheet back in 2015. Some of the components shown in the old datasheet are no longer necessary simply due to advances in the electronics industry over the last 20 years. Hi quality LDO's were not in production, so noisier power supplies might have needed PI Filters to minimize noise. Hi quality ceramic capacitors were not readily available in 1993. You can certainly still use some of the guidance from the older datasheet, as well as the associated application notes referenced there. If you are working on a new design, I would encourage you to look into the ISO224 which is the newest isolation amplifier in our portfolio.