Input Signal Levels for AD9286-500EBZ

Hi all,

 

I'm trying to do SPI control for the AD9286 High speed ADC using an Arduino Uno and Labview. The outputs from the Arduino Uno are 5V for logic high and 0 for Logic Low. I saw while reviewing the schematic of AD9286-500 BZ (UG191.pdf) that the buffer NC7W716 is used for level translation. Referring to this ICs data sheet I found that the input for this IC can be upto a maximum of 5.5V. So, following this, can I connect the Arduino's Outputs to the SPI control pins in the Evaluation board ?

 

I'm asking this because in the UG191 document I did not find any references to absolute maximum logic input levels.

 

Thank you

 

Mugundhan

  • 0
    •  Analog Employees 
    on Jul 8, 2014 4:11 PM

    Hi Mugundhan,

    The maximum logic values for the AD9286 are given in Table 3 of the data sheet.  The CMOS input pins have a maximum input of DRVDD + 0.3V (and maximum DRVDD is 2.0V, recommended is 1.8V).  The level translator may be capable of more, but is not driven in such a way on the evaluation board.  Please follow the data sheet recommendations for the AD9286.  The data sheet can be found at: http://www.analog.com/static/imported-files/data_sheets/AD9286.pdf.

    Regards,

    Jonathan

  • Hello Harris,

    I read the datasheet and found the maximum value of DRVDD to be around 1.8V. So this means that the inputs of the ADC can tolerate voltages up-to 2.1 V, maximum. I'm looking to develop an application using AD9286 which needs me to interface the ADC with the Arduino, whose GPIO pins are capable of a 5V output. So, I must not give this directly to the input of the ADC, but must use a buffer for translating the voltage. Must this level translator be made by me externally or is the level translator in the evaluation board sufficient, if I look to interface the evaluation board with the Arduino.

    Thank you!

    Mugundhan

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:42 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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    EZ Admin