Need to find ADC to measure 20 strain gauge signals in mV range at 2000-4000 sps

Ashesh Shrestha

Other Parts Discussed in Thread: ADS131M08, ADS131M06

I am trying to measure about 20 strain gauges signal (+-10mV range) at 2000-4000 sps for each strain gauge. I am looking for ADC which can read the data effectively. Below is the mentioned requirements.

Input voltage range +-10mV
no of signals 20

Requirements:

Resolution----------------------------16 bit and above
On-chip Reference Better --------if available
In-Amp --------------------------------128x
SPS ----------------------------------- 2000 - 4000 per channel
Simultaneous sampling -------- Better if available
No of channels/ ADC in a single chip. ----More than 6 channels. 20 would be great but don't have much hope to find it.

I have tried my best to look the ADCs which can fulfill my requirements but it seems I am unable to find any ADC in that category. I hope you can help me on this regard.

over 4 years ago

0 Joseph Wu over 4 years ago

TI__Guru* 97435 points

Ashesh,

I don't know of too many options for that many channels. My best recommendation would be the ADS131M08, which is an 8 channel device (there is also a 6 channel version called the ADS131M06).

These devices are 24-bit, with simultaneously sampling ADCs. They have a 1.2V internal reference and a PGA (with gain up to 128) for each channel. The data rate goes as high as 32kSPS (each channel). I would note that if you use the external reference, the reference voltage can only be as large as 1.3V. You can reach the product folder from the link below:

https://www.ti.com/product/ADS131M08

Joseph Wu

0 Ashesh Shrestha over 4 years ago in reply to Joseph Wu

Prodigy 50 points

Dear Joseph,

Thank you for your suggestion. The ADC that you suggested works for me.

0 Joseph Wu over 4 years ago in reply to Ashesh Shrestha

TI__Guru* 97435 points

Ashesh,

I'm glad the suggestion works for you. When you do put together a circuit and are ready for a review. Feel free to post back with your schematic and layout and we would be glad to review it with you.

Joseph Wu

0 Ashesh Shrestha over 4 years ago in reply to Joseph Wu

Prodigy 50 points

Joseph Wu said:

Ashesh,

I'm glad the suggestion works for you. When you do put together a circuit and are ready for a review. Feel free to post back with your schematic and layout and we would be glad to review it with you.

Joseph Wu

Sure.

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Need to find ADC to measure 20 strain gauge signals in mV range at 2000-4000 sps