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Enable AD9689 fast detect?

Question asked by aryert on May 4, 2018
Latest reply on May 10, 2018 by UmeshJ

I am having a hard time getting the fast detect indicator (either FD_A or FD_B) to go high. Copying the example in page 37 in the AD9689 datasheet, I have set the upper and lower thresholds to -6 dbFS and -10 dBFS respectively, and enabled fast detect at register 0x0245. Using a multimeter and an oscilloscope, I have been unable to detect any change in FD_A or FD_B by varying dbFS above and below the set thresholds. Is there another register(s) that I also need to change to enable fast detect?

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