If you are looking for the difference between Analog Devices’ ADUCM320BBCZ vs ADUCM320BBCZI, it may be not easy to find out from datasheets.
The major difference we can see from the parts’ datasheets:
ADUCM320BBCZ, Software triggered in-circuit reprogrammability via management data input/output (MDIO)
ADUCM320BBCZI, In circuit reprogrammability via I2C
For detail, please refer to both datasheets.
Applicable part numbers
ADUCM320BBCZ-RL
ADUCM320BBCZI-RL
ADUCM320BBCZI
ADUCM320BBCZ
505-ADUCM320BBCZ-RLTR-ND,505-ADUCM320BBCZ-RLCT-ND,505-ADUCM320BBCZ-RLDKR-ND
505-ADUCM320BBCZI-RLTR-ND,505-ADUCM320BBCZI-RLCT-ND,505-ADUCM320BBCZI-RLDKR-ND
505-ADUCM320BBCZI-ND
505-ADUCM320BBCZ-ND
EV-ADUCM320QSPZ
EVAL-ADUCM320IQSPZ
EV-ADUCM320QSPZ-ND
505-EVAL-ADUCM320IQSPZ-ND