I'd like to determine a suitable series resistor value put on I2C lines of AD5254.
Therefore, could you tell me typical drive strength (output current) of I2C interface of AD5254 and its IBIS model?
The standard value of the resistors that we use is 2.2kΩ for the SDA and SCL lines in the I2C protocol. You can find the IBIS model in the product page of the part. It should look something like this: