RFM68W

RFM68W

3

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This product datasheet contains a detailed description of the RFM68W performance and functionality.

1. Circuit Description

1.1.

General Description

The RFM68W 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 RFM68W 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 RFM68W suitable for low-cost battery chemistries or energy harvesting

applications.

1.2.

Block Diagram

The figure below shows the simplified block diagram of the RFM68W