THS4531: wheatstone bridge with ADS1115

Hello Stefan,

What are the key care abouts and needs for your system?  Our FDAs are certainly capable for driving ADCs across different performance needs.

The THS4531 is our ultra low power FDA.  If your design is sensitive to power draw, this FDA would be my recommendation.

If you are not sensitive to power, I would also ask you evaluate our CMOS FDA, which is available for preview and samples: THS4535

Best,

Alec

Hello Alec

My project is not sensitive to power. Yes evaluate your  CMOS FDA, even another CMOS with fully differential amplifier 

would be possible. But THS4531 is not yet available.

regards

Stefan

Hello Stefan,

THS4535 is available and will RTM completely by the end of the year.  You are able to order samples and evaluate:

https://www.ti.com/product/THS4535

Best,

Alec

Hi Alec

 Can you also recommend a new instrumentation amplifier for the wheatstone bridge? 

an existing or new one?

It should have low noise and very little offset drift and very low 1/f noise .

For this amp I have enough power and space on my board.

together with the THS4535 would also be possible

Hello Stefan,

I will work on this support for you.  I will give a response by early next week.  Please let me know if you have any additional questions while I work on this.

Best,

Alec

Hi Alec

Yes I have one. 

If there is a better or newer ad converter than the ADS1115 for this circuit ?

I can also use another Ad-converter. I just need to measure at 2 kHz. It doesn't matter whether it's i2C or SPI, 16 or 24 bits. 1 Channel or more channel is ok

Perhaps there is a possibility with the ref pin and output opamp to connect

Hello Stefan,

That is a good follow-up question; I am catching up on emails & e2e after having Friday off, so I will get back to you this week.

Are you looking for effective number of bits (ENOB) to be 16 - 24 bits, or the converter type/classification?

I will use your shared requirements to work on an overall solution.

Best,

Alec