On my board, I have two AD9122 components.
I program the component with the below registers:
0x0D = 0xD6
0x0A = 0xF8
0x08 = 0xFF
0x1C = 0x04
0x1D = 0x24
0x1E = 0x12
All the others registers are the default value.
The ouput power is different on each AD9122 components. And if I use another baord, I have other ouput power.
Thanks for your help
Hi Biao Huang,
You can find below my test process on AD9122 component. On my board, I have two AD9122 components.
1/ AD9122 components are connected to Xilinx FPGA (xc5vsx95t).
All the data pins are always level high.
FRAMEP = ‘0’ and FRAMEN = ‘1’
RESET = ‘1’
DCIP and DCIN differential clock = 130MHz
REFCLKP and REFCLKN differential clock = 130MHz
DACCLKP and DACCLKN differential clock = 1040MHz
2/ I program the registers with the below values
0x0D = 0xD6 0x0A = 0xF8 0x08 = 0xFF 0x1C = 0x04 0x1D = 0x24 0x1E = 0x12 All the others registers have the default values.
3/ I measure the frequency and the output power on IOUT1P output pin. The frequency is equal to 130MHz. However, the output power changes when I measure the signal on the others components or others boards.
1st board – 1st AD9122 – Power = - 43 dBm
1st board – 2nd AD9122 – Power = - 17 dBm
2nd board – 1st AD9122 – Power = - 15 dBm
2nd board – 2nd AD9122 – Power = - 8 dBm
My question is why the output power changes strongly and it is not the same.
Thanks for your support.