• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 168 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS9219EVM: negative ADC values while expected positive

Andrei Smaliarou
Prodigy 65 points
Part Number: ADS9219EVM
Other Parts Discussed in Thread: ADS9219, THS4541

Tool/software:

Hi, I'm having the following measurement results

Vin code 24-bit
0 FFD5C0 FFEB40 FFF9C0
0,1 EC7340 EC3F00 EC7280
0,2 D8E180 D8E980 D91300
0,3 C58800 C5B1C0 C5A600
 
// DATA_FORMAT = Two's-complement
  '{8'h0D, 16'h2002},

using single-ended AINAP; AINAM jumper JP7 set
I double checked wires polarity
why am I getting negative values?

  • +1
    TI__Expert 4240 points

    Hello Andrei, 

    Your commands and connections seem fine, it seems the issue comes from the way the outputs of the THS4541 are connected to the ADS9219. This is what is inverting your measurements. This was probably an oversight when designing the board. 

    Best regards, 

    Yolanda