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ADC3222 Front-end Circuit(Opeamp)

cafain
Mastermind 6755 points
Other Parts Discussed in Thread: ADC3222, ADS5281, THS4521, THS4541

Hi,

ADC3222 Front-end Circuit(Opeamp)

1) Although analog input is ± 1V = 2Vpp, does it can be used in single-ended.   

     If possible, please tell me the circuit configuration.

2) In the data sheet, and to change the analog signal of single to differential, it's using a transformer,   

     We want to achieve an operational amplifier.   

     Please tell me the optimal device name. Further, the circuit does it also can suggest?

Best regards

  • 0
    TI__Guru* 91947 points

    ADC32XXEVM-SCH_C.pdfCafain,

    Attached is a schematic that has an option for driving the ADC with an op amp. Why do you want to possibly drive single-ended? The performance will be reduced in most cases in this application. I am not sure if this device can be operated in this mode. I will get back with you on this.

    Regards,

    Jim

      

  • 0 in reply to jim s
    Mastermind 6755 points

    Hi, Jim-san

    I thank you for your support.

    In previous circuit I was using the ADS5281 and THS4521.

    This time, it plans to use the ADC3222 and THS4521.

    (Transe and THS4541 was NG at a cost)

    In differential in THS4521 single-ended analog signal, enter the ADC3222.

    Different common voltage of the AD converter, but I believe that can be adjusted by the amplifier.

    Is my understanding is wrong? Do not work?

    Best regards

  • 0 in reply to cafain
    TI__Guru* 91947 points

    Cafain,

    Do you plan on connecting the THS5421 to the ADC in differential mode (recommended) or single-ended? I cannot tell from your message. The VCM output of the ADC should be connected to the VCM input of the THS5421 to provide the proper common mode signal to the ADC. Please send us your schematic and we will review for you.

    Regards,

    Jim 

  • 0 in reply to jim s
    TI__Genius 12965 points
    Please refer to this TI Design. It is applicable for ADC3xxx family and the THS4541. Biggest difference is the performance spec of the THS4541 is better than the THS4521. But the same concept can be applied. We can ask the amp team for more help if needed to validate the schematic design.

    www.ti.com/.../TIDA-00294

    Ken
  • 0 in reply to Ken C
    Mastermind 6755 points

    Hi, Ken-san

    It is thanks to the kind support.

    At the moment, it plans to form a circuit with THS4521.
    When a problem occurs in the design, thank you support.

    Best regards