IDT uses two types of IDT receivers; P type which are labeled PClk/nPCLk and N type, labeled Clk/nCLK. The common mode range of P type receivers is centered at a higher voltage than that of the N type receivers as can be seen in Table 1 below. These two types of IDT receivers are paired with one of three different sets of internal resistors. These internal resistors are selected to simplify the external networks necessary for common applications as in Table 2 below. These networks can also be used to minimize the number of external resistors necessary to provide the DC bias for AC coupled inputs from differential transmission lines. The only requirement is that the DC bias lies within the common mode range of the particular receiver. Refer to application note AN-844 for more details. For other questions not addressed by the Knowledge Base, please submit a technical support request.