Question
AD9144 datasheet does not report value of tEN_SDIO and tDIS_SDIO for supported 3-wire SPI mode (described in AN-877). Is it possible to know themin-max value of those parameters?
Answer
We could use the tDV to judge when the output data will be available from the falling edge on the output pin.
Both of these have similar meaning but a bit different. tDV means how much time the output data will be valid on the SDIO after the falling edge ofSCLK. If the users wants to avoiding driving SDIO after it becomes output, he needs to release the bus prior to the falling edge of SCLK.