ADS1292: ADS1292 Vcap2 Vref issue

alexis long

Part Number: ADS1292

Hi TI team,

I am testing a custom PCB with the ADS1292.

I found out that my ADS1292 have defaults. On the 10 I have already soldered, I always have Vcap2 around 4.25V. This Vcap2 voltage is much higher than (AVDD+AVSS)/2 with AVDD=2.8V and AVSS=0V in my case. On some devices Vref = 2.4V and on others Vref=0V. Otherwise all other steps cited in [FAQ] ADS129x: How do I verify that my ADS129x device is still functional? - Data converters forum - Data converters - TI E2E support forums are working fine.

I suspect that hand soldering the 0201 components connected to the ADS1292 channel inputs might have damaged the ADS1292 internally. Do you think we should solder other ADS1292 components on channel inputs with a soldering machine?

Best regards

over 4 years ago

+1 TCT over 4 years ago

TI__Genius 11550 points

Hi Alexis,

Thanks for the post.

Based on your description, it sounds like there is some issue with the custom PCB manufacturing. Therefore, I recommend using a proper PCB manufacturer for the component assembly of the custom PCB.

Thanks

-TC

0 alexis long over 4 years ago in reply to TCT

Prodigy 120 points

Hi TCT,

It still does not work. We soldered the nearby components at less than 250°C and still get this issue. I would like to discuss with you privately.

Best regards

0 TCT over 4 years ago in reply to alexis long

TI__Genius 11550 points

Hi Alexis,

You can reach out to the ADS129x AFEs support mailing list at ads129x-support@list.ti.com. Thanks.

Thanks

-TC

0 alexis long over 4 years ago in reply to TCT

Prodigy 120 points

Thank you for correcting this link e2e.ti.com/.../2868597