• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 31 subscribers
  • Views 418 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.

Original question:

TLV320ADC3140: Input common mode DC full-scale range

TLV320ADC3140: Input common mode DC full-scale range

Kuramochi Tadahiko
Guru 28715 points

Part Number: TLV320ADC3140

Hi,

I post the same question as to the related thread.

How much is Input common-mode DC full-scale range in DC coupled input mode?

Does it depend on VREF setting?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 23050 points

    Hi Kuramochi-san,

    The input common-mode should be set to accommodate the expected input signal swing so that the max signal level + common-mode bias does not exceed the ADC input range. The device itself will bias the inputs to ~1.48V internally to support 2Vrms differential input with VREF = 2.75V. The input common-mode bias does change if the VREF settings is changed though. For reference, changing VREF to 2.5V moves the input bas down to ~1.35V. The input is biased slightly higher than 1/2*VREF to allow for some margin since the input PGA cannot swing all the way to GND. I hope this helps!

    Best,

    Zak