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AD9777 current increased for a moment

Question asked by bigfrog on Jul 25, 2018


I used an AD9777 on my board, but recently I found a problem. When I configure the AD9777 via SPI, to turn on the PLL, and use 4x or 8x, the current consumption will incease much more about 300ms, then turn to normal. During configuration, there is no reference clock. If I keep the reference clock on, the current consumption will be normal. I

want to know, when confugration without reference clock, if the current increasing for a moment is OK? and why the current will increase for a moment?

Any one can help me? Thanks!