The UCC561 LVD Regulator set is designed to provide the correct references voltages and bias currents for LVD termination resistor networks (475 , 121 and 475 ). The device also provides a 1.3V output for Diff Sense signaling. With the proper resistor network, the UCC561 solution will meet the common mode bias impedance, differential bias, and termination impedance requirements of SPI-2 (Ultra2) and SPI-3 (Ultra3).