ADC12DJ3200: Under-Sampling Question

Richard Elmquist

Part Number: ADC12DJ3200

I have a customer who is asking the following questions about under-sampling with the ADC12DJ3200:

We are developing direct sampling of an analog Ka signal of bandwidth 2.5Gz centered around 28.75GHz. This is for a satellite project.

I found TI has this component that could be usable. However, for our need, I could consider sampling in Nyquist Zone 10 of 6.1Gsps. Does this ADC work at this NZ? Could you provide some info about performance analysis in NZ 10 of of 6.1Gsps?

Can we answer the customer’s questions about under-sampling with the ADC12DJ3200?

Thanks for your help with this!

Richard Elmquist

over 9 years ago

0 Jim Brinkhurst1 over 9 years ago

TI__Mastermind 44680 points

Hi Richard

Despite the phenomenal input bandwidth of the ADC12DJ3200 (8 GHz -3dB bandwidth), under-sampling of a signal at 28.75GHz is not practical. Very large signal attenuation and poor jitter limited SNR will result in unacceptable performance.

I recommend the customer consider one step of down-conversion to generate an IF signal that is within the 2nd or 3rd Nyquist zone of the ADC.

Best regards,

Jim B

0 Richard Elmquist over 9 years ago in reply to Jim Brinkhurst1

TI__Mastermind 45250 points

Jim,

Thanks for your response!

Can you recommend a converter that might work for his application?

Thanks for your help with this.

Richard Elmquist

0 Jim Brinkhurst1 over 9 years ago in reply to Richard Elmquist

TI__Mastermind 44680 points

Hi Richard

We are working directly with this customer to find the best solution for their need.

Best regards,

Jim B

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ADC12DJ3200: Under-Sampling Question