Hi Yaniv, answering your questions:
1. AXM0F343 in the schematic example you used NT2016SA-48M-END4910A (48 MHz TCXO - Oscillator), however this DEVICE no longer exists in mouser / digikey.
- At the end of 2020 a fire disrupted the global availability of TCXOs. The NT2016SA-48M was affected by the consequent worldwide shortage.
- NDK has samples stock of NT2016SA-48M-END4910A. You can check directly with David Maurel at NDK. email@example.com .
2. do you have hardware design guide for AXM0F343 or RF chip that the AXM0F343 is based on?
- We recommend our customers to copy as much as possible of the radio layour, PCB stackup, and BOM from our reference designs.
- BOM and Gerber files of the AXM0F343-GEVB are available at:
- You can also copy the design of the AX8052F143 mini kit, as this SoC is pin2pin compatible with the AXM0F343 and they require the exact same RBOM.
3. When should I need a TCXO?
- Depending on the application, a more or less precise reference clock shall be used. TCXOs are more stable (<5 ppm) with respect to XTAL (or XO) oscillators (~10-50 ppm). XTAL oscillators are less expensive and consume less power, but for narrowband applications where clock stability is fundamental for a successful reception, a TCXO is required.
- A deeper explanation on the topic is given in this app note from Skyworks, check from page 14, Appendix A/B—How to Select the Right XTAL for your Application (skyworksinc.com)
4. if I use low rate 20 bytes code once in few minutes at 15dbm in long range 40m indoor and 250m out door with auto ack :
- in your case, you can adapt the PHY to your needs. The lower the datarate, the higher will be the sensitivity, but the more precise your clock reference will have to be.
- AX-Configuration-Utility has a built-in check that will mark fields in red if the RX BW / Datarate / Deviation / XTAL precision are not compatible with each other. You can read further about it from page 33 of the user manual that you can open directly from the GUI as shown below:
5.Can I use without tcxo ? Is 16MHz TCXO good for long range 15dbm low rate with auto ack ?
- Yes, the AXM0F343 can operate with TCXOs or XTALs, with frequency spanning from 10 MHz to 50 MHz, as shown in Table 8 of the AXM0F343 datasheet and below:
For a specific post on how to modify HW/SW to work with a custom reference clock check out FAQ: Use different TCXO or XTAL with AXM0F343 - Connectivity / Sub-GHz - onsemi Community Forums