Phase Select Input. The AD9832 has

Phase Select Input. The AD9832 has four phase registers. These registers can be used to alter the value being input to the SIN ROM. The contents of the phase register are added to the phase accumulator output, the inputs PSEL0 and PSEL1 selecting the phase register to be used. Alternatively, the phase register to be used can be selected using the PSEL0 and PSEL1 bits. Like the FSELECT input, PSEL0 and PSEL1 are sampled on the rising MCLK edge. Therefore, these inputs need to be in steady state when an MCLK rising edge occurs or there is an uncertainty of one MCLK cycle as to when control is transferred to the selected phase register. When the phase registers are being controlled by the PSEL0 and PSEL1 bits, the pins should be tied to DGND.