When writing to a frequency/phase register, the first four bits identify whether a frequency or phase register is being written to, the next four bits contain the address of the destination register, while the 8 LSBs contain the data. Table 6 lists the addresses for the phase/frequency registers, and Table 7 and Table 8 list the data structure for each. For an example on programming the AD9832, see the AN-621 application note, Programming the AD9832/AD9835, at www.analog.com.