AD9609 bandwidth limitations

Hello,

i am reviewing the AD9609 and i see that the datasheet specifies the FPBW as 700MHz but all of the characterization plots are only showing up to 200MHz performance. 

My question would be, is there any limitation to pushing the analog input bandwidth to for example 600MHz in a single ended configuration?  As well does it need to be a differential input signal? 

Can you provide some guidance as to the performance i could expect at 600MHz analog bandwidth sampling with -80 part (i.e. 80MSPS) IF. 

Thanks!

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  • 0
    •  Analog Employees 
    on Oct 9, 2014 4:38 AM

    Hi Rene,

    ADC inputs have an analog low-pass transfer characteristic. This is before and separate from any data conversion capability. The full power input bandwidth refers to the 3dB corner frequency of this low-pass characteristic. This gives an indication of attenuation levels of signals at various frequencies, and of the noise bandwidth.

    For example, in the case of the AD9609, the full power input bandwidth of 700MHz tells you that there will be little attenuation of signals in the 10s of MHz or even in the few hundred MHz range. It gives no indication as to the ability to convert data at 700MHz. I do not have any performance data at Fin = 600MHz, though I cannot imagine it would be very good, especially single ended. Harmonics get worse when driving single ended. FYI Figure 38 in the AD9609 datasheet shows an example of how to configure the front end for single-ended operation.

    I'm sorry I do not have information at Fin = 600MHz. I would recommend a higher speed converter for this frequency. What is the application you have in mind? Do you need 600MHz of bandwidth, or is 600MHz your frequency of interest?

    Thanks,

    Doug

Reply
  • 0
    •  Analog Employees 
    on Oct 9, 2014 4:38 AM

    Hi Rene,

    ADC inputs have an analog low-pass transfer characteristic. This is before and separate from any data conversion capability. The full power input bandwidth refers to the 3dB corner frequency of this low-pass characteristic. This gives an indication of attenuation levels of signals at various frequencies, and of the noise bandwidth.

    For example, in the case of the AD9609, the full power input bandwidth of 700MHz tells you that there will be little attenuation of signals in the 10s of MHz or even in the few hundred MHz range. It gives no indication as to the ability to convert data at 700MHz. I do not have any performance data at Fin = 600MHz, though I cannot imagine it would be very good, especially single ended. Harmonics get worse when driving single ended. FYI Figure 38 in the AD9609 datasheet shows an example of how to configure the front end for single-ended operation.

    I'm sorry I do not have information at Fin = 600MHz. I would recommend a higher speed converter for this frequency. What is the application you have in mind? Do you need 600MHz of bandwidth, or is 600MHz your frequency of interest?

    Thanks,

    Doug

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