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AMC3330: Regarding the internal reference of the AMC3330

Kyohei
Expert 2956 points

Part Number: AMC3330
Other Parts Discussed in Thread: TLV6001

Hi team,

My customer is considering designing an insulation‑resistance measurement circuit based on TIDA‑010232. I have three questions regarding this.

Since the input voltage to the AMC3330 will have the positive side at a higher potential, we are considering setting the VREF of the TLV6001 to a value lower than 2.5 V.

  • If the internal reference is set to 2.048 V, is it acceptable to apply 5 V to REFP and REFN? Or should these pins be left open when using the internal reference?

  • The voltage applied to ADIN is expected to be 0–5 V. Will the device operate properly even though the internal reference is 2.048 V?

  • We are considering a single‑ended configuration, with AIN0 connected to the analog input and AIN1 connected to the analog ground. My understanding is that using a differential input improves analog accuracy. Is this correct?

Best regards,

Kyohei

  • 0
    TI__Expert 5015 points

    Hi Kyohei,

    I think we are talking about the AMC3330 which is used for isolation voltage sensing, which is U5 in the schematics, correct?
    I have a few general comments and  questions:

    1. The input voltage of this device will be symmetrical around 0V. In case SN (U4) is closed we will see a negative input and in case SP(U3) is closed we will see a positive input.
    2. Which 2.5V reference are you refereeing to? TLV6001 uses a 1.65V Reference as bias. to convert the differential signal from AMC3330 into a single ended signal which can be read by the ADC.
    3. We use a 3.3V Microcontroller, so the voltage ad the ADC Input needs to be 0 to 3.3V
    4. Which pins are you refereeing to with REFP and REFN? There are no pins on AMC3330 or TLV6001 like this.