ADC12J4000EVM: how to set LMK04828 OUTPUT 4000MHz?

xiao weihua

Part Number: ADC12J4000EVM
Other Parts Discussed in Thread: LMK04828, TRF3765

The datasheet said that LMK04828 has two VCOs and the MAX VCO1 frequency is 3080MHz, how to set this chip output 4000MHz?

I checked the schematic and found that the LMK04828 is drive by TRF3765, and the clock is divided by 2 via MIC10EP32D, so how it worked? what is the frequency relationship with these chips?

over 7 years ago

0 jim s over 7 years ago

TI__Guru* 91947 points

Xiao,

The TRF3765 is a synthesizer capable of running up to 4800MHz. This device is used to drive the ADC clock. This part is sending a divide by two clock to the LMK to synchronize the two parts and guarantee this clock never exceeds 3GHz. The LMK is used to generate the SYSREF for both the ADC and FPGA as well as the device clock for the FPGA and these clocks must be synchronized with the ADC clock.

Regards,

Jim

0 xiao weihua over 7 years ago in reply to jim s

Intellectual 500 points

I understand, thank you!

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ADC12J4000EVM: how to set LMK04828 OUTPUT 4000MHz?