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ADC3422 / SYSREF input

Guru 20090 points

Replies: 1

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Hello,

Why does the ADC3422 have SYSREF input?
I think that SYSREF input is for JESD204B interface.
In the ADC34J22 datasheet, there are the timing description of SYSREF. But there is no discription in the ADC3422.

Should we float these pins and PDN SYSREF bit assert 1?

Best Regards,
Ryuji Asaka

  • Genius 12785 points
    Hi Ryugi
    The SYSREF on the LVDS devices are not used as they are in the JESD204B devices. The SYSREF in this case is used to reset the clock circuits within the ADC device to a known state so that you can synchronize multiple devices.

    The SYSREF for the LVDS devices should be tied logic low. In this case you may tie both SYSREFP/M to gnd. You may also float the pins and enable the DISABLE SYSREF BUF setting.

    Ken

    HSDC

    High Speed Products

    HPA

     

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