LMK04828: 156.25MHz clock generation

Kaushal C

Part Number: LMK04828

Dear Team,

I need the following output frequency as mentioned below in photo with 150MHz VCXO input. Please provide the clock file or any document related to generate these frequencies. When I tried in tool for internal VCO with 3000MHz I couldn't generate 156.25MHz at output. Also attached my clock file, please check if there is any issue in that for ADC interface

clock.tcs

Regards,
Kaushal

over 1 year ago

0 William Pfennigwerth over 1 year ago

TI__Expert 8421 points

Kaushal,

I will get back to you tommorow.

Regards,

Will

0 Kaushal C over 1 year ago in reply to William Pfennigwerth

Intellectual 450 points

Hi Will,

Any updates?

Regards,
Kaushal

0 Kaushal C over 1 year ago

Intellectual 450 points

Hello,

Is there any updates regarding the required frequency?

Regards,
Kaushal

+1 William Pfennigwerth over 1 year ago in reply to Kaushal C

TI__Expert 8421 points

Kaushal,

I am very sorry for the long delay.

Yes, LVPECL outputs can work with ADC inputs. Check with the ADC datasheet to confirm the input clock specs.

Because you need a 300MHz (and factors of 300) as well as 156.25MHz, you will need a VCO frequency that can be divided down to both of these numbers. Finding the least common multiple we see that it is 7.5GHz, well above the VCO range for the LMK04828. This means to create a standard configuration is impossible.

Can you change your required frequencies?

You may need to use multiple devices to produce this set of frequencies.

Regards,

Will