RFM68CW
RFM68CW
This product datasheet contains a detailed description of the RFM68CW performance and functionality.
1. Circuit Description
1.1. General Description
The RFM68CW is a multi-band transmitter module capable of FSK and OOK modulation of an input data stream.
It contains a frequency synthesizer which is a fractional-N sigma-delta PLL. For frequency modulation (FSK), the
modulation is made inside the PLL bandwidth. For amplitude modulation (OOK), the modulation is performed by turning on
and off the output PA.
The Power Amplifier (PA), connected to the RFOUT pin, can deliver 0 dBm or +10 dBm in a 50 Ω load. Each of these two
output powers need a specific matching network when efficiency needs to be optimized.
The circuit can be configured via a simplified TWI interface, constituted of pin CTRL and DATA. The pins of this interface
are also used to transmit the modulating data to the module.
Another key feature of the RFM68CW is its low current consumption in Transmit and Sleep modes and its wide voltage
operating range from 1.8 V to 3.7 V. This makes the RFM68CW suitable for low-cost battery chemistries or energy
harvesting applications.
1.2. Block Diagram
The figure below shows the simplified block diagram of the RFM68CW
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