• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 311 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:

TLV320ADC6140: ADC Performance

TLV320ADC6140: Audio Signal Input Range

Koshi Ninomiya
Expert 5605 points
Part Number: TLV320ADC6140


Hi Team,

My customer is considering to use the TLV320ADC6140 as audio ADC with 384kHz sampling rate.
 - Audio Signal Input Channel Configuration is Analog differential input.
 - P0_R59_D[1:0] : ADC_FSCALE[1:0] = "00" (default) for DIFFERENTIAL FULLSCALE INPUT SUPPORTED = 2Vrms.

Electrical Characteristics of TLV320ADC6140 datasheet shows,
 - Differential input full-scale AC signal voltage: AC-coupled input: Typ= 2 VRMS

Which one is the typical differential AC-coupled input rage?
 a)  (INxP - INxN) = -1.41V to +1.41V
 b)  (INxP - INxN) = -2.82V to +2.82V
 c)  (INxP - INxN) = 0V to +2.82V

Best Regards,

Koshi Ninomiya

  • 0
    TI__Guru 64125 points

    Hello,

    For reference, please review the following app note which describes which features and channel combinations are available for the different sampling rates:  http://www.ti.com/lit/pdf/sbaa381

    The full-scale input voltage is 2Vrms which equals roughly 5.657Vpp, or +/-2.828V.  Therefore the correct answer is B.  Note that there is a non-zero gain error which may cause inputs slightly less than, or greater than 2Vrms to be the actual full-scale input voltage.