AD9695 data sheet clarification between speed grades

The data sheet for the AD9695 shows performance for 1300 MSPS and 625 MSPS.

Does this represent two different parts based on testing, or the same part clocked at different rates?

I would like to use this device in the neighborhood of 625 MSPS or somewhat less for first Nyquist signals.

My real question is, for signals below 300 MHz with ADC clocked at 600 MSPS, would I get better spur free performance from a 625 MSPS part or a 1300 MSPS part?

Please clarify.  Thanks.

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  • +1
    •  Analog Employees 
    on Aug 24, 2019 2:33 PM
    Does this represent two different parts based on testing, or the same part clocked at different rates?

    Two separate parts. Each is power and performance optimized to operate at the respective speed grades. 

    I would like to use this device in the neighborhood of 625 MSPS or somewhat less for first Nyquist signals.

    In that case, I would use the 625MSPS version as it is power and performance optimized to operate at 625MSPS and below

    My real question is, for signals below 300 MHz with ADC clocked at 600 MSPS, would I get better spur free performance from a 625 MSPS part or a 1300 MSPS part?

    You would get better SFDR from the 625 speed grade. You can see this in the datasheet typical performance characteristics. Below is the sample rate sweep data at 170MHz from the 1300MSPS speed grade part

    Below is the same sweep on the -625MSPS speed grade part, at 170MHz

    Hope this helps.

    Umesh

Reply
  • +1
    •  Analog Employees 
    on Aug 24, 2019 2:33 PM
    Does this represent two different parts based on testing, or the same part clocked at different rates?

    Two separate parts. Each is power and performance optimized to operate at the respective speed grades. 

    I would like to use this device in the neighborhood of 625 MSPS or somewhat less for first Nyquist signals.

    In that case, I would use the 625MSPS version as it is power and performance optimized to operate at 625MSPS and below

    My real question is, for signals below 300 MHz with ADC clocked at 600 MSPS, would I get better spur free performance from a 625 MSPS part or a 1300 MSPS part?

    You would get better SFDR from the 625 speed grade. You can see this in the datasheet typical performance characteristics. Below is the sample rate sweep data at 170MHz from the 1300MSPS speed grade part

    Below is the same sweep on the -625MSPS speed grade part, at 170MHz

    Hope this helps.

    Umesh

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