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ADC08060: mid range high speed ADCs sampling clock solution

Part Number: ADC08060
Other Parts Discussed in Thread: ADS831, LMK01010

Hello

What are the solutions for sampling clock generation of single/multiple mid range high speed converters like adc08060 or ads831 with\out phase shift?

Thanks.

  • Hi Aseok

    One possibility is to use a good quality (low jitter, 50% duty cycle) crystal oscillator module for the source and fan-out to multiple drivers using a buffer fan-out device.

    Here are some possibilities that can operate at 60 MHz or higher and  have single ended outputs.

    http://www.ti.com/lsds/ti/clock-and-timing/single-ended-products.page#p1099max=60;1500

    The additive jitter and output to output skew for these devices are quite good and would be well suited for this application.

    Best regards,

    Jim B

  • What are phase shifting solutions available for interleaving multiple converters purpose?

  • Hi Aseok
    Something like the LMK01010 might be suitable, but that one has differential outputs. For the ADCs you are targeting you will need a CMOS or LVCMOS output.
    For more recommendations try posting in the Clock and Timing forum (e2e.ti.com/.../48).
    If you can provide the number of clock outputs needed, clock frequency, skew range and skew step size targets you are looking for someone there should be able to help.
    Best regards,
    Jim B
  • It is mentioned in the datasheet about RC termination of clock line when driving multiple A\D's, that:
    This termination should be located as close as possible to, but within one centimeter of, the ADC08060 clock pin.
    Further, the termination should be beyond the ADC08060 clock pin as seen from the clock source.
    What does the last sentence mean?
  • Hi Aseok

    Here is a sketch showing both proper and improper location of the RC. In the first case the termination is at the end of the transmission line and will help minimize reflections back up the long line. The second case has the ADC clock receiver located farther down the transmission line past the termination. In that case the high impedance clock input will create a stub at the end of the transmission line and cause reflections of the clock signal back up the line.

    Best regards,

    Jim B