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AD9139, DAC latency from input to output

Question asked by usaghi on Aug 4, 2014
Latest reply on Jan 13, 2015 by usaghi



I have reported from a customer using AD9139 that DAC latency which is defined from digital input to analog output is observed normally fixed time, by using 4 FIFO depth through SPI, however sometime it increase 80ns(equivalent to x8 data clock) more, without any other problem symptom. FIFO Level Readback Register always indicates 4 when read.

Amount of the delay is always 80ns, never be intermediate values.


Can you figure out reason of the delay, or any comments what should we check for ?


Best Regards,