ADS8681: External Reference Input range

Abdul Choudhury

Part Number: ADS8681
Other Parts Discussed in Thread: ADS8920B, ADS8860, ADS8329

I want pair the ADS8681 with the REF7030QFKHT, will the ADS8681 take 3.0V external reference with its multiplier set to 1.5 to make the operating input range 1.5 x 3.0V = 4.5V. If not is there an alternative part that will operate from 5V supply and but give an ADC input range of 0V to 4.5V.

over 1 year ago

0 Abdul Choudhury over 1 year ago

Prodigy 30 points

ADS8920B

www.ti.com/.../ads8920b.pdf

0 Abdul Choudhury over 1 year ago

Prodigy 30 points

ADS8860 Looks good.

0 Ryan Andrews over 1 year ago

TI__Guru 60986 points

Hello Abdul,

Thank you for your post.

To answer your first question, the ADS8681 can only accept an external reference voltage input of 4.096 V ±50 mV. The REF7030 cannot be used here. Why not use the REF7040 instead?

The other two parts you mentioned can accept a lower reference voltage input, but the full-scale range is only 0 V to VREF or ±VREF.

Regards,

Ryan

0 Abdul Choudhury over 1 year ago

Prodigy 30 points

ADS8329

Data converters

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ADS8681: External Reference Input range