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LMK04208: Why could LMK04208 output clock before configuration through SPI interface?

shen jie
Intellectual 335 points

Part Number: LMK04208

Hi, all:

I have a question about default output of LMK04208:

On my board, it is very strange that LMK04208 could output clock before configuration, such as 114.2MHz on the Clkout4 and 122.88MHz on the Clkout5. Why could LMK04208 output clock before configuration?

Or, maybe this chip is a custom order part which is pre-programmed device in advance?

Thanks in advance!

figure.1 114.2MHz on the Clkout4

figure.2 122.8MHz on the Clkout5

best regards!

Jason