About ADF4372

Hi,

It looks like PLL is not locked. Can you provide your register settings with writing sequence and your reference frequency?

Kudret

Hello,

      The INITIALIZATION SEQUENCE is refer to the datasheet. First, Write 0x18 and 0x00 to Address 0x00 and Address 0x01. Then write to each register in reverse order from Address 0x7C to Address 0x10.  The data writen into 0x1f to 0x10 is show below:

SPI2_SendByte (0X01);///0x1f
SPI2_SendByte (0X58);///0x1e
SPI2_SendByte (0X00);///0x1d
SPI2_SendByte (0X00);///0x1c
SPI2_SendByte (0X00);///0x1b
SPI2_SendByte (0X00);///0x1a
SPI2_SendByte (0X01);///0x19
SPI2_SendByte (0X00);///0x18
SPI2_SendByte (0X01);///0x17
SPI2_SendByte (0X40);///0x16
SPI2_SendByte (0X00);///0x15
SPI2_SendByte (0X00);///0x14
SPI2_SendByte (0X00);///0x13
SPI2_SendByte (0X40);///0x12
SPI2_SendByte (0X00);///0x11
SPI2_SendByte (0X00);///0x10

    And ,after the frequency update sequence, The output frequency not change.

Hi,

Are you writing the suggested register values to Reg0x7C to Reg0x1B or different values in the initialization? 

Hello, 

    I have write the value show in the ace software. Do you mean the default value of each REG in the datasheet?   

Hello, I realize its been a few months, but how does the ACE software handle the read registers when initializing the chip? According to the datasheet, after initializing the first two registers, you can perform a steam mode operation to write registers 0x7C down to 0x10. However, 0x7C, 0x6F, and 0x6E seem to only have read access. Does the software write 0x00, skip the register, or something else?

Thanks in advance 

Answered here:

(+) When Programming SPI ADF4372, what to do with read access registers - Q&A - RF and Microwave - EngineerZone (analog.com)

Answered here:

(+) When Programming SPI ADF4372, what to do with read access registers - Q&A - RF and Microwave - EngineerZone (analog.com)