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LDC1101: Usage with external multiplexer.

Froylan Aguirre
Prodigy 140 points
Part Number: LDC1101
Other Parts Discussed in Thread: TIDA-01102, , TS3A5017, LDC1614

I am considering a design with four LDC1101 chips. I know that the LDC1614 is a quad version with LHR measurement, however, the LDC1101 has LHR and Rp+L modes. A reference design for the LDC1614, TIDA-01102 uses the TS3A5017 multiplexer. Although LHR and Rp+L are different measurement modes, I don't see using a multiplexer (like the TS3A5017) with the LDC1101 in Rp+L mode being a problem.

Sensor frequency will be somewhere between 1MHz to 2MHz.

So my question is: Would the TS3A5017 multiplexer (or equivalent) be appropriate to use with the LDC1101 in Rp+L mode?

  • +1
    TI__Genius 17660 points

    Hello, 

    Yes the TS3A5017 multiplexer would work with the LDC1101. Adding the multiplexer in the path adds to the series resistance and will offset the Rp+L measurement when compared to an identical implementation without the mux but the measurement will still change with the target interaction. If you look for similar alternatives, it is important to keep it a dual single pole multiplexer so that the two sensor channels of the device are impacted the same way by the multiplexer and switched at the same time. Also keep in mind the bandwidth of the multiplexer and how it relates to your sensor frequency. The TS3A5017 has plenty of bandwidth for a 1 to 2MHz sensor frequency. 

    Best Regards, 

    Justin Beigel