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TMUX1209: TMUX1209PWR POWER SOURCE

Muzaffer Nizam
Prodigy 50 points
Part Number: TMUX1209
Other Parts Discussed in Thread: INA827, ADS1261, , TMUX1109

Tool/software:

Hi,

I have designed a schematic for an analog measurement as shown below. On the analog input side, I can also receive negative analog signals from some sensors. The integrated circuits I used are indicated in the block diagram. In this case, to avoid distorting the negative signals coming from the sensor, should I set the supply voltage of the TMUX1209PWR to +5V, GND or +2.5V, -2.5V? I couldn't find any information about the negative voltage supply for the TMUX1209PWR. I would appreciate your insights on this matter. To summarize, I am configuring the analog data received from a thermocouple sensor at the input with a MUX and then transmitting the analog signal from the MUX to the INA827. I am reading the single-ended signal received from the INA827 with the ADS1261.

Best regards.

  • +1
    Guru 297970 points

    The TMUX1209 does not have a negative supply separate from GND. This means that when you connect the TMUX1209's GND to −2.5 V, then your digital control signals also must use this voltage. (With the isolator, this might actually be easy.)

    The (much more expensive) TMUX1109 has VSS on pin 3.

  • +1 in reply to Clemens Ladisch
    TI__Mastermind 19040 points

    Hello I agree with both of Clemens statements.

    If you would like to  use the same design you have now but pass negative voltage signals please use the TMUX1109 instead of the TMUX1209

    Please let us know if you need any other  assistance!

    Regards,

    Kameron