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Can you recommend right ADC for 3.5MHz ultrasound with 6kHz pulse repetition?

Question asked by adc123 on Aug 4, 2013
Latest reply on Aug 14, 2013 by ginak

Hi

 

  I am trying to design an ultrasound system.  I need to find a right ADC for it.

 

  Transducer : 3.5MHz center frequency +- 10%

  Signal bandwidth : Expect to be low.  say 2~5MHz at most.

  Unfocused.  Beam is expected to spread from 0.05m. 

  Pulse repetition (!! key factor to choose ADC sps?)  : 6kHz.  In other words, every 0.000167 seconds shoot pulse.

 

  How many samples : 128 samples.  I want to make 128 samples per pulse transmission.

  My rough calculation:

  It seems, I need to sample 128 times every 0.000167 seconds. 

  It turns out ~768ksps required ( < 1 Msps).  So i would choose 2~3Msps with 10 bits resolution. 

 

  Transmit pulse will be 5V.  Not sure how much voltage I would get from receiving pulse (out of human body).  Might be 100 times less (50mV).

 

  I looked into some adcs that have 3Msps and 10bits. and I am not sure if the ADC will do this job. 

  With all those facts, which ADC will be capable of 3.5MHz signal with 768ksps required with very tiny voltage return?

 

Thanks,

Heichang

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