Hello @kwebster83,
As TLV320ADC5140 is not an NXP product we can't guarantee you it will work properly. Being that said, theoretically I2S connection would work. Related with the I2C connection do not forget to connect ADDR0_SCLK and ADDR1_MISO pins pulled to VSS or IOVDD, and to work the K26 as master, as TLV320ADC5140 supports the I2C control protocol as a slave device.
Please check the following I2C and I2S specifications:
They might be useful.
Best regards, Raul.