adf4159

Question

hello, 
 i am using adf4159 for generating ramp and CW signal at 5600 MHz and my PFD is 100 MHz but i am not able to see the MUX output status like VDD or GND. IS this because of software or hardware issue. i had separately checked VCO & Crystal oscillator both are working my schematic is matching with EVAL board . and i am using OP184 loop filter i had used ADI simPLL Software to generate the RAMP and used the values suggested there. 
 i checked physical lines data is going to chip in msb first format and i not getting time out on spi either, i have use TXS0108E level shifter rather than potential divider for level shifting. Please help.

emrecangidik · Accepted Answer

Hi Pihu, 
 If Muxout is not responding to the SPI command, it is most probably related to SPI communication. 
 What is the voltage level on each supply pin of the ADF4159? 
 Can you send oscilloscope measurements of the SPI lines? Can you send your register write sequence for MUXOUT settings? 
 You said you have used a level shifter between the controller and ADF4159, can you place a series 30ohm resistor along the CLK and SDATA pins between the level shifter and ADF4159? 
 
 Thanks, Emrecan)

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adf4159