• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 482 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.

ADC128S102: Need help to understand if this ADC is operate with a SCLK of 1MHz

Koh Wee Kiat
Prodigy 10 points
Part Number: ADC128S102
Other Parts Discussed in Thread: ADC128S022

Hi Experts, 

I have a question regarding the operating frequency of ADC128S102. 

From the datasheet, https://www.ti.com/lit/ds/symlink/adc128s102.pdf?ts=1645695740333, it is stated that the recommended operating frequency is 0.8 MHz. However, The minimum frequency is stated as 8 MHz. Will this ADC work with a 1 MHz Sclk ? The application in my project requires an ADC with a frequency of 1 MHz or less due the the distance between the master and the ADC.

Thanks !

Best Regards,

Wee Kiat

  • +1
    TI__Guru 64205 points

    Hello,

    The ADC128S102 sampling rate is directly set by the SCLK frequency.  Since there are 16-bits in the transfer and the max sampling rate is 1MSPS, the max SCLK is 16*1M = 16MHz.  Since the minimum recommended sampling rate for this product is 500kSPS, the minimum SCLK frequency is therefore 500k*16 = 8MHz.  While the device is fully specified and rated from 500kSPS to 1MSPS, (SCLK = 8MHz - 16MHz), the product can operate over the full 50kSPS to 1MSPS range (SCLK = 0.8MHz - 16MHz).  Note that most choose to purchase the ADC128S022 for lower sampling rates as it's rated from 50kSPS to 200kSPS. 

  • 0 in reply to Collin Wells
    Prodigy 10 points

    HI Collin, thank you very much for your reply and recommendation. It helped me greatly.