LMX2615-SP: RECAL_EN for SEE

Michael T Schneider

Part Number: LMX2615-SP

The RECAL feature helps mitigate the scenario when the VCO is in lock but loses lock when radiation event occurs.

Currently in our breadboard (same as TI Eval board), wehave it pulled down low. I know it is internally pulled up high to VCC with 200 kohms.

Does this mean that the RECAL_EN feature is enabled based on the TI Eval board/breadboard schematic?

If it not enabled, Do we need to have a pull up resistor?

over 5 years ago

0 Noel Fung over 5 years ago

TI__Guru** 107300 points

Hi Michael,

Please see feedback in email.

0 Michael T Schneider over 5 years ago in reply to Noel Fung

TI__Expert 3790 points

For the sake of others with the same question:

If RECAL is needed, then we have to pull up the RECAL_EN pin.

In the EVM, remove R7 so that the RECAL_EN is open and is pulled up by the internal 200kΩ resistor. In their board, I suggest externally pull up the pin with a few kilo ohms resistor.

Clock & timing

Clock & timing forum

LMX2615-SP: RECAL_EN for SEE