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Doubts on ADC

May
Genius 9880 points

Hi Team,

Good day.

We received inquiry from customer and they want to know more about the ADC. For me to not miss information, I ll copy the query below.

"

Hello Texas Instruments team , I have few doubts on ADC, in many datasheet I saw two important parameters sampling rate and analog bandwidth.

But sometimes I saw sampling rate of 100MSPS with analog bandwidth of 200MHz, and some ADCs show's 5MSPS sampling rate with 100MHz analog bandwidth.

Now my question is if a ADC datasheet shows 500MHz analog bandwidth then can I use that ADC for a signal range of 0 to 500MHz ?

Also sampling rate has any influence on input signal range ?

If given analog bandwidth is not maximum range, then how to calculate maximum allowable frequency range for a ADC ?

"

Thank you and looking forward for your kind response.

Regards,

Maynard

  • 0
    TI__Mastermind 23050 points

    Hi Maynard,

    The analog bandwidth describes the bandwidth of the front end input stage, which dictates how fast of a signal can be passed into the device without significant analog attenuation.

    The sample rate is the maximum rate that the ADC can sample that input signal. In most applications it is common to abide by the Nyquist criterion and make sure that your sample rate is at least 2x the highest frequency you want to sample so sample rate/2 typically determines that maximum input signal you want (assuming the analog input bandwidth is greater than this).

    However really the requirement is that the sample rate needs to be 2x the bandwidth of the signal you want to sample, so if your converter can handle higher frequency input it is possible to do 2nd or 3rd Nyquist sampling by undersampling the signal and measuring the resulting aliased signal.

    Best,

    Zak