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ADG3300 LEVEL TRANSLATOR

Hello Sir/Ma'am,

Good evening,

I am using in my design ADG3300BRUZ for a level translation from 3.3V to 1.8V. Used for the temperature sensor, and temperature sensor is connected with I2C lines (SCL and SDA), and I2C pins are the open-drain, Temperature sensor is on the DAC board,  Mother connected and DAC connected with FMC connector. Mother board consist a FPGA, and FPGA bank is operating at a 1.8v. 

I2C pin have connected with 4.7K pull up resistor, and due to the pull up resistor pin is not going up-to 0V, Afterward we have change the pull-up value from 4.7k to the 10k and pin goes low. But when the pins goes low the ringing is coming that why temperature sensor is unable to read the status of the of DAC board, 

Please suggest me how to correct it.

I am attaching the snapshot of the schematic and  and output of the pin that i have observed on the oscilloscope.

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  • Hi VPANDEY482,

    I am currently looking into this and. I have some questions.

    1. Can you provide the following information that will determine the minimum and the maximum values of the pull-up resistor that is required by the I2C lines?
     - Maximum rise time for both SCL and SDA, tr
     - Voltage and Current Output Low, Vol and Iol
     - Bus Capacitance, Cb

    2. What is the state of the enable pin and its voltage level?

    3. Can you also provide the scope shots of the following nodes on your current set up?
     - Vccy
     - Vcca
     - Input and Output pin of the level translator

    4. Have you tried isolating the level translator and compared its input versus output signals? Can you provide scope shots?

    Also, make sure that the input driving requirements are met.



    Best regards,
    Christian

  • Hello Sir,
    Can be use this level translator ADG3300BRUZ for the open drain configuration or not ??

  • Hi VPANDEY482,

    Yes. You can connect devices with an open-drain output configuration to ADG3300 to bi-directionally translate certain voltage levels through the Vcca and Vccb supplies.

    Best Regards,
    Christian

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