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ADS1298ECG-FE Cable Shield

Gary Arnold2
Prodigy 70 points
Other Parts Discussed in Thread: ADS1298

I am looking closely at the schematic contained in the ADS1298ECG-FE User Guide (SBAU171C).   This is a demo board for the ADS1298 ECG chip.  I am a bit confused on the driven cable shield signal.  The idea is to invert the RLD signal and drive the cable shield that attaches to the board via a 15 pin DSUB connector.  OK, makes sense.  The schematic shows the ECG_SHD_DRV signal going through a jumper where it becomes ELEC_SHD (jumper choice is to use either GND or ECG_SHD_DRV for the shield).  Then, strangely, the ELEC_SHD signal ties to pin 6 of the DSUB connector(!?)  Is that correct?  Why would it tie to pin 6?  Is this a special cable arrangement where the specified cable (from Biometric Cables) ties the cable shield to pin 6?  I am prototyping an idea and would like to use the Biometric Cable.  I just need to know how to properly handle the driven shield signal.  Thanks in advance for any insight into this issue.  Have a great day!

Gary

  • 0
    TI__Guru 66296 points

    Hi Gary, 

    That's exactly it: Pin 6 of the DSUB connector is the cable shield for the Biometric Cables. I do not know if that is a standard configuration for all ECG cables, however.

    There should be a pinout diagram included with the Biometric Cables. A blurry copy of that diagram is included in our User's Guide, but you can make out "SHIELD" pointing to pin 6 for confirmation:

    Best Regards,