SNAS605AS March 2013 – May 2020 LMK04821 , LMK04826 , LMK04828
PRODUCTION DATA.
Both CLKin ports can be driven by differential signals. TI recommends that the CLKin input mode be set to bipolar (CLKinX_TYPE = 0) when using differential reference clocks. The OSCin input mode is hard-wired to bipolar-equivalent. The LMK0482x family internally biases the input pins, thus the differential interface should be AC coupled. The recommended circuits for driving the CLKin/OSCin pins with either LVDS or LVPECL are shown in Figure 24 and Figure 25.
A reference clock source that produces a differential sine wave output can drive the CLKin/OSCin pins using the following circuit. The signal level must conform to the requirements for the CLKin/OSCin pins listed in Electrical Characteristics.