Part Number: LMX2592EVM
Other Parts Discussed in Thread: LMX2592
Hi Team,
The customer is using LMX2592EVM. He tries the methods below：
1.Enable the fast lock mode.
2.Change the Loop Filter to 300K、400K、800K and 1MHz respectively at a charge pump current of 10mA.
Q1: The customer would like to confirm if the lock time for LMX2592 can be less than 40us.
Q2: How to get a shorter lock time?
For the Q1, I use the PLLatinum Sim Tool.
First, I select LMX2592 on the PLLatinum Sim Tool.
Second, I select "Filter Designer" and input 300KHZ loop bandwidth.
Third, I click "Calculate Loop Filter".
Fourth, I check "Lock Time". The total lock time is 862.5us. After, I input 400K、800K and 1MHz as the loop bandwidth of "Filter Designer" ,
but the total lock time is always 862.5us. Please check the attach.
Q3: Is my simulation method for the customer's questions correct?
Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments
