RF data transmission circuit diagram

In order to ensure the system still has high transmit power and receiving sensitivity under low current consumption, the system uses NXP's highly integrated single-chip transmitter PCH7900. The PCH7900 is highly integrated and requires only a few external components for ASK and FSK modulated transmitters at 315/434/868/915MHz and data rates up to 40 kbps. The RF data transmission circuit based on PCH7900 is shown in the figure. The circuit parameters for the 315 MHz and 868 MHz transmit frequencies are set in Table 1.

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