• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 46 subscribers
  • Views 520 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1278: Application circuit of ADS1278

Nived Mukundan
Prodigy 205 points
Part Number: ADS1278
Other Parts Discussed in Thread: , OPA2350, THS4521

Hi, 

Can anyone help me with an application circuit design for ADS1278?

I would just need the circuit diagram with the necessary components for synchronous data acquisition. 

  • 0
    TI__Mastermind 46490 points

    Hello Nived,

    The ADS1278EVM-PDK user's guide shows an example circuit.  This design uses the REF5025 + OPA2350 for the reference circuit, and the THS4521 for the input driver.

    You mention synchronous data acquisition; do you need more than 8 channels in your system?  If not, each of the ADC's in the ADS1278 are always synchronized to each other.

    Regards,
    Keith Nicholas
    Precision ADC Applications

  • 0 in reply to Keith Nicholas
    Prodigy 205 points

    Hello Keith,

    Thank you for your quick response. Actually I want to obtain 16 channel synchronous data ie. would like to use two ADS1278 in the daisy chain. Could you let me know where can I find that circuit?

  • 0 in reply to Nived Mukundan
    TI__Mastermind 46490 points

    Hello Nived,

    I am not aware of a reference design, but the details are outlined in the datasheet.

    You can daisy chain two ADS1278's using SPI for a total of 16 channels.  Please note that your maximum output data rate for each of the channels will be limited due to the maximum SCLK frequency equal to FCLK.  For SPI, FCLKmax=27MHz.

    Operating the data converter in high resolution mode will limit your max data rate to 52.734Ksps for each channel.  Figure 81 in the datasheet shows the necessary connections.  SYNC, SCLK and CLK will be shared by both devices, your host MCU will monitor the DRDY line and when it pulses, you can transfer all 16 channels in one SPI frame.

    Regards,
    Keith

  • 0 in reply to Keith Nicholas
    Prodigy 205 points

    Thank you so much for your response.