ADS7128: some design quesiton

user4979989

Part Number: ADS7128

Hi Sir,

If DVDD = 3.3V and AVDD = 5V.

This means we can monitor the voltage up to 5V, and I2C pull up can be 3.3V(DVDD), is it correct?

We want to monitor 0.6V, 0.8V, 1.8V and 3.3V, should we add any components at AVINx or we can connect AVINx to the voltage we want to monitor directly?

Thank you.

over 4 years ago

0 user4979989 over 4 years ago

TI__Intellectual 2800 points

Hi Sir,

Can someone help?

Thanks.

0 Cynthia over 4 years ago

TI__Mastermind 25020 points

Hello,

Your understanding is correct. the AVDD sets the analog input range, while the DVDD sets the digital communication voltage level.

Driving the input signal depends on various factors, such as signal source, sampling rate.

For some helpful educational material on ADCs, including how to drive the input signal, TI offers a series of video on the subject through Precision Labs: ADCs

Regards

Cynthia

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ADS7128: some design quesiton