Other Parts Discussed in Thread: LMK05318B, LMK05318
My primary goal is to correct the factory and aging errors of the TCXO using LMK5B12204. My current application needs the device to function only as a clock generator. Please let me know the simplest way to achieve this:
1. In TICS Pro, LMK5B12204 has the option to either enable or disable DPLL. With the DPLL disabled, I can use TCXO frequencies like 10, 25 or 50 MHz. But I also need the option of correcting the frequency error of the TCXO through SPI (software ppm correction). The one option I see mentioned is "Free-run tuning word". Seems like it's a 40 bit register but the datasheet doesn't explain its working (2's complement?). Is it a part of the APLL or does it need the DPLL enabled to work? Will it work with any frequency TCXO?
2. Can LMK5B12204 work without any XO input and using only the reference inputs? If yes, can I connect the TCXO directly to the reference inputs and use the DCO for frequency correction?
3. Other option I can think of, is to enable the DPLL mode. Use a compatible frequency TCXO (ex. 20 MHz). Split the TCXO output and feed it to both the XO pin and PRIREF or SECREF reference input. Then I can use the DCO to correct the error? Feels convoluted.
