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TINA/Spice/TIDA-00561: TIDA-00561

zz kk
Prodigy 20 points
Part Number: TIDA-00561
Other Parts Discussed in Thread: TINA-TI, , ADS1220, LMP91200

Tool/software: TINA-TI or Spice Models

Hello,

I want ask about the appropriate sensors which can be used for TIDA-00561 Wireless pH Sensor Transmitter. Would it possible to use it also for ISFET sensors? what is the consideration to use it for ISFET sensors? besides using this circuit for ISFET sensors should I still use other electrical circuits for measuring pH while using ISFET sensor?
I appreciate any comments and assistance in this issue.


Thanks.

  • 0
    TI__Intellectual 880 points
    Hi,
    The compatibility of the sensor with TIDA-00561 is driven by the compatibility with the front-end which is LMP91200 and the ADS1220 as well as the SMA connector on the PCB.
    In other words if your ISFET sensor is compatible with pH sensor electrical characteristics (see user's guide p10):
    1) a voltage output,
    2) with a full scale within -600mV..600mV ,
    3) and has a hight output impedance,
    4) and a BNC connector (to allow connection to your PCB)

    you should be able to measure your values from your sensor.

    Best,
    Matthieu
  • 0 in reply to MCV
    Prodigy 20 points

    Hi,


    Thank you so much for your prompt response and information.
    I did not use the ISFET sensors before. I just need pH sensors with long-term stability which work properly without calibration need for long time. I have read that ISFET pH sensors impedance is much lower than in a glass electrode, which greatly reduces drift and noise due to stray currents and its output voltage is in a range of 0 - 2 volt. So in this case I can conclude I can not use TIDA-00561. Is it right?

    thank you for your attention,
    Zeinab

  • 0 in reply to zz kk
    TI__Intellectual 880 points

    Hi Zeinab,

    To answer your question, one would have to look carefully at the ISFET sensor datasheet and see if it matches the TIDA-00561 Hardware Design.

    So the only possible answer is to say that we cannot conclude.

    Best,

    Matthieu