Part Number: LMX2571
Dear Expert:
The current circuit scheme uses an external VCO frequency of 136-174 MHZ. The external VCO signal enters from pin 24 FIN, is driven by the internal OutputDivider of LM2571, and then outputs from pin 17 RFoutTx. The current circuit scheme will result in in-band TX spurry. The application circuit is shown in the following figure:
In-band stray:
After the circuit scheme is changed, the external VCO is still used. The VCO signal is divided into two paths. One path, Fin, is input to pin 24 of the LM2571 for locking the VCO, while the other path, TXVCO B1, is directly driven and sent out by the power stage and no longer outputs from pin 17 of the LM2571. How should the LM2571 software be configured at this time? Application circuit:
