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Pogramming the AD9517-4

Question asked by Orlando on Apr 6, 2016
Latest reply on Apr 6, 2016 by neilw

My design is based on the reference design: UG-328-DesignSupport from Analog Devices, Basically it consist of a AD9517-4, and the AD9253. In my design I program the different blocks from a Zynq FPGA.

I am trying to program the AD9517-4 with no completelly success. I can play arround with the LD, REFMON, and STATUS pins, mor¡nitoring different internal signals, so this proves my SPI bus is working OK. However PLL (AD9517-4) does not look.

Although I know the PLL (AD9517-4) is not locked I play around, doing:

My reference signal is 10MHz that is connected to REF1 (pin 48) and to CLK  (pin 11).

If I set CLK as source:

"01E1","00000000","00"

then I can se the CLK signal internaly divided (VCO DIV = 3 and DIVIDER0 =7) in the output 0 (pins 41 and 42) a signal of 476,2kHz (as it is supposed to be)

if I select VCO (1500MHz) as source (VCO DIV = 3 and DIVIDER0 =7)

"01E1","00000010","02"

i get no signal at all, just zero volts. Even though the PLL is not locked I should se a frequency division of the not locked PLL, shouldn´t I?

 

The VCO cal is another mistery this is my programming file

 

"0000","00011000","18"

"0001","00000000","00"

"0002","00010000","10"

"0003","11010011","D3"

"0004","00000000","00"

"0010","00111100","3C"

"0011","00000001","01"

"0012","00000000","00"

"0013","00000110","06"

"0014","00001001","09"

"0015","00000000","00"

"0016","01000101","45"

"0017","10001100","8C"

"0018","00000111","07"

"0019","00001001","09"

"001A","01100011","63"

"001B","11100011","E3"

"001C","00100010","22"

"001D","00001000","08"

"001E","00000000","00"

"001F","00001110","0E"

"00A0","00000000","00"

"00A1","00000000","00"

"00A2","00000000","00"

"00A3","00000000","00"

"00A4","00000000","00"

"00A5","00000000","00"

"00A6","00000000","00"

"00A7","00000000","00"

"00A8","00000000","00"

"00A9","00000000","00"

"00AA","00000000","00"

"00AB","00000000","00"

"00F0","00001100","0C"

"00F1","00001100","0C"

"00F4","00001000","08"

"00F5","00001000","08"

"0140","01000010","42"

"0141","01000010","42"

"0142","01000010","42"

"0143","01001010","4A"

"0190","00110010","32"

"0191","00000000","00"

"0192","00000000","00"

"0196","00000000","00"

"0197","00000000","00"

"0198","00000000","00"

"0199","00100010","22"

"019A","00000000","00"

"019B","00010001","11"

"019C","00000000","00"

"019D","00000000","00"

"019E","00100010","22"

"019F","00000000","00"

"01A0","00010001","11"

"01A1","00000000","00"

"01A2","00000000","00"

"01A3","00000000","00"

"01E0","00000001","01"

"01E1","00000010","02"

"0230","00000000","00"

"0231","00000000","00"

"0232","00000001","00"

 

and then to cal VCO I do

 

"0018","00000110","06"

0232","00000000","00"

"0018","00000111","07"

0232","00000001","00"

 

Please help me!!!!

 

BR

Orlando

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