ADS1298: lower input bias request for 24bit ADC

Ben Kuo

Expert 7570 points

Part Number: ADS1298
Other Parts Discussed in Thread: ADS1299, ADS124S08, ADS1292

Dear expert,

Customer are looking for 24bits ADC which with lower input bias current (<1pA) and SPI output.

Did you have any suggested solution? thanks

Regards,

Ben

over 5 years ago

0 Alexander Smith over 5 years ago

TI__Guru 55322 points

Hi Ben,

I am not aware of the device with bias currents this low, but I've asked another colleague of mine. Can you share why the customer is interested in a device with bias currents at this level?

0 Alexander Smith over 5 years ago in reply to Alexander Smith

TI__Guru 55322 points

Hi Ben,

ADS124S08, ADS1292, and ADS1299 are going to be the best alternatives to ADS1298 in terms of bias current, however they are not less than 1pA.

0 Ben Kuo over 5 years ago in reply to Alexander Smith

TI__Expert 7570 points

Hi Alex,

Lower input bias current is one of spec of sensor (as the pic I attached in last post).

If we don't have suitable solution now, can we design with OPAMP to implement this application.

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ADS1298: lower input bias request for 24bit ADC