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ADS1256: Vref Designing

Prajwal Bhuse
Prodigy 90 points
Part Number: ADS1256
Other Parts Discussed in Thread: REF5025, OPA350, REF6025, ADS1261

Tool/software:

Dear Team,

Hope all are Doing well.

I'm currently working with data converter series. for that purpose, I've selected ADS1256 as my ADC.

by referring the Datasheet, most of the points are cleared to me but I've doubt in Vref section.

as ADS1256 having external 2.5v reference input, How many ways are available to give external voltage. kindly check the questions below:

1. what if i give 2.5v directly to ADS1256 as reference ?

2. is it mandatorily need to use external reference IC like ref5025 ?

3. what will be the recommended circuit design for ADS1256? if possible, could anyone share simulation file from TINA ?

Kindly check this and let me know.

Feel free to ask queries.

Hoping to hear from you soon.

Thanks & Regards,

Mr. Prajwal P. Bhuse

  • +1
    TI__Mastermind 37211 points

    Hi Prajwal Bhuse,

    Here are the answers to your questions:

    Prajwal Bhuse said:
    what if i give 2.5v directly to ADS1256 as reference ?

    Yes this makes sense because 2.5V is the nominal voltage reference required by the ADC and specified in the datasheet

    Prajwal Bhuse said:
    is it mandatorily need to use external reference IC like ref5025 ?

    This depends on the application. A reference IC is common however because this is a high-resolution ADC, so if you use a cheap reference circuit you might get very bad performance

    Prajwal Bhuse said:
    what will be the recommended circuit design for ADS1256? if possible, could anyone share simulation file from TINA ?

    A recommended circuit is provided in the datasheet that uses the REF5025 and the OPA350 as a buffer. We also have buffered reference ICs such as REF6025 that includes the buffer in the device. Excluding passives, you can connect the REF6025 directly to the ADS1256

    You can also consider using the ADS1261, which is the next-generation version of the ADS1256. The ADS1261 includes an internal reference voltage, so it will be somewhat simpler to design with compared to the ADS1256

    -Bryan

  • 0 in reply to Bryan Lizon86
    Prodigy 90 points

    Hello Bryan,

    Thanks for your reply.

    I'll check this and will get back to you for any further query.

    Thanks & Regards,
    Mr. Prajwal P. Bhuse