about ads1292r

Jun

Intellectual 430 points

Other Parts Discussed in Thread: ADS1292R, ADS1292

hi,

I found in ads1292r's datasheet, it has a discription like this:

but in ads1292r's user guide, the SCH is like this:

C22 and C58 connect to a digital ground . so which ground should i use here (DGND or AVSS) ?

over 8 years ago

0 Amy Schnoor over 8 years ago

TI__Mastermind 18275 points

Jun,

I am moving your post to the correct forum. This is handled by the Precision Data Converter group.

0 Ryan Andrews over 8 years ago in reply to Amy Schnoor

TI__Guru 57306 points

Hi Jun,

Good catch! All of the analog bypass capacitors should be connected to AVSS. On the EVM, AVSS is shorted to DGND through R46 because the ADS1292 is operating on a single-supply; however, it is more appropriate to show these caps tied to AVSS or analog ground instead.

Keep in mind that AVSS may not always be equal to ground, such as when you are using bipolar supplies.

Best Regards,

0 Jun over 8 years ago in reply to Ryan Andrews

Intellectual 430 points

thanks very much, if i connect ads1292r's exposed thermal pad to the ground(AVSS or DGND), which is better? may you give me some suggestions?

0 Ryan Andrews over 8 years ago in reply to Jun

TI__Guru 57306 points

Hi Jun - you should tie the ADS1292R thermal pad to AVSS.

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