LMX2820: Function of SRREQ pin.

Colin Chen

Part Number: LMX2820

Hi team,

My customer want to test LMX2820 and I am not familiar with the device, they want to know the the function of input pin SRREQ. Could you pls tell me the function and how to configure it?

Many thanks!

Colin

over 4 years ago

0 Noel Fung over 4 years ago

TI__Guru** 107030 points

Hi Colin,

SRREQ is the SYSREF input signal to the synthesizer, datasheet section 7.3.13 has the description. Addition information can be found in the EVM GUI, TICS Pro.

0 Colin Chen over 4 years ago in reply to Noel Fung

TI__Mastermind 21031 points

Hi Noel,

Thanks for your help.

My customer get the EVM and confused about the curved wiring. If in order to ensure the same wire length, the short wire can be extended, why all wires have to bend ?

0 Noel Fung over 4 years ago in reply to Colin Chen

TI__Guru** 107030 points

Hi Colin,

What did you mean by " the short wire can be extended" ?

0 Colin Chen over 4 years ago in reply to Noel Fung

TI__Mastermind 21031 points

Hi Noel,

Sorry for not expressing clearly.

Generally, long wires do not need to be bent too much, and only short wires need to be bent to ensure the same wire length. However, all the wires on the EVM are bent. What are the considerations for taking this wiring method?

0 Noel Fung over 4 years ago in reply to Colin Chen

TI__Guru** 107030 points

Hi Colin,

The blue circled traces have similar trace lengths, they don't have bending. Other traces have bending to match them. There is nothing weird here.

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LMX2820: Function of SRREQ pin.