I need exact 40 MHz sampling rate. But the vcxo used in the board is 122.88 MHz. So it is not possible to set 40 MHz. To solve the problem I changed the vcxo with 80 MHz (CVHD-950-80) and changed the PLL parameters of AD9548 and AD9523. But for AD9548 Phase Lock Detect bit is not become 1. Also AD9523 PLL2 is locked but PLL1 is not locking! REF B for PLL1 of AD9523 is 20 MHz and RefB Div is 1, N Div is 4.