INA849: Documentation for noise caluculation

Hello Carolina-san,

Thank you for your reply and attach ppt.

Except this, is there any other documentation/application note which is described how we analysis noise for instrumentation AMP ?
One of this, I found following document but if you have another one, could you please let me know ?
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjd_KK5_J-NAxWZklYBHeo1M8YQFnoECBQQAQ&url=https%3A%2F%2Fe2e.ti.com%2Fcfs-file%2F__key%2Ftelligent-evolution-components-attachments%2F00-14-01-00-00-98-88-94%2FInstrumentation-Amplifier-Noise-Analysis_2D00_clean.ppt&usg=AOvVaw142dbHSMQCiQs5fRbQtLuF&opi=89978449

Best Regards,

Hello Machida-san, 

The only additional piece of content I was able to find was that the INA849 has super-beta inputs, Super-Beta Input Amplifiers: Features and Benefits. 

We are in the process of developing more training, could you please let us know what the customer is looking for. 

All the best,
Carolina 

Hello Carolina-san,

Thank you for your reply.
Understood.

By the way, going back to original question.
According to our slide, you use eni=1 and eno=45 for INA849.
However, when I checked datasheet of AD8429, they defined this spec as "MAX".
On the other hands, TI defined this spec as "TYP".
It is OK to show as reference data/sample data, but could you please disclose "MAX" spec of "eni" and "eno" of INA849 ?

Best Regards,

Hello Machida-san, 

I compared the noise curves available in the datasheet, and they are almost identical - even if ADI specs them as "Max"

The current noise is worse in AD8429 than specification and INA849 is accurate in specification: 

I have included both these slides in the newest version of the ppt: Take Share from AD8429 with INA849 (P2P).pptx

All the best,
Carolina

Hello,

Thank you for your reply.
I'm sorry I'm not sure what is difference b/w datasheet spec of "eni" and your attached "figure 7-24".
Because, I assume that "figure 7-24" is also based on "typ" value of "eni". Just show all frequency range.

What I would like to confirm is whether "figure7-24" is showed based on "max" value of "eni" or not.
Could you give your comment about this ?

Best Regards,

Hello Machida-san, 

Figure 7-24 is a typical, I highlighted the value at 1kHz for both current and voltage noise. 

I was trying to show that although AD8429 says "max" in reality, it is very similar to INA849. 

I cannot provide maximum values for INA849 but I can provide the following sample data.

Voltage noise (eni), sample size is 10. 

Current noise (in), sample size is 20. 

All the best,
Carolina

Hello,

Thank you for your reply and sending informaion.
Is it possible to disclose same data for "eno" as well ?

Best Regards,

Hello Machida-san, 

Yes, the eno data is also available, sample size is 10

All the best,
Carolina