RF68 Datasheet, PDF (3/21 Pages) List of Unclassifed Manufacturers – Low Cost Integrated Transmitter IC

RF68
1. Circuit Description
1.1. General Description
The RF68 is a fully-integrated multi-band, single chip transmitter IC 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 frequency reference used by the PLL is generated by a 22, 24 or 26 MHz crystal oscillator, depending on the
frequency band of interest.
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 chip.
Another key feature of the RF68 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 RF68 suitable for low-cost battery chemistries or energy harvesting
applications.
1.2. Block Diagram
The figure below shows the simplified block diagram of the RF68 die mounted in a DFN8 package.
Figure 1. RF68 Simplified Block Diagram and BOM
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