RFM22B-868-D QUASAR, RFM22B-868-D Datasheet - Page 11

• Manufacturer Part Number: RFM22B-868-D
• Description: MODULE, TRANSCEIVER, 20DB, 868MHZ
• Manufacturer: QUASAR

Specifications of RFM22B-868-D

• Modulation Type: FSK, GFSK, OOK
• Data Rate Max: 256Kbps
• Sensitivity: -121dBm
• Supply Voltage Range: 1.8V To 3.6V
• Supply Current: 85mA
• Interface Type: SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2. Functional Description
an ideal solution for battery powered applications.
The RFM22B/23B operates as a time division duplexing (TDD) transceiver where the device alternately transmits
and receives data packets. The device uses a single-conversion mixer to downconvert the 2-level FSK/GFSK/OOK
modulated receive signal to a low IF frequency. Following a programmable gain amplifier (PGA) the signal is
converted to the digital domain by a high performance ΔΣ ADC allowing filtering, demodulation, slicing, and packet
handling to be performed in the built-in DSP increasing the receiver’s performance and flexibility versus analog
based architectures. The demodulated signal is then output to the system MCU through a programmable GPIO or
via the standard SPI bus by reading the 64-byte RX FIFO.
A single high precision local oscillator (LO) is used for both transmit and receive modes since the transmitter and
receiver do not operate at the same time. The LO is generated by an integrated VCO and ΔΣ Fractional-N PLL
synthesizer. The synthesizer is designed to support configurable data rates, output frequency and frequency
deviation at 433MHz, 470MHz,868MHz,915MHz band. The transmit FSK data is modulated directly into the ΔΣ
data stream and can be shaped by a Gaussian low-pass filter to reduce unwanted spectral content.
The RFM22B’s PA output power can be configured between +1 and +20 dBm in 3 dB steps, while the RFM23B's
PA output power can be configured between –8 and +13 dBm in
frequency hopping, TX/RX switch control, and antenna diversity switch control to extend the link range and
improve performance
HopeRF's RFM22B/23B are highly integrated,low cost,433/470/868/915MHz wireless ISM transceivers
module . The wide operating voltage range of 1.8–3.6 V and low current consumption makes theRFM22B/23B
The RFM22B/23B is designed to work with a microcontroller to create a very low cost system as shown Figure
1. Voltage regula tors are integrated on-chip which allows for a wide operating supply voltage range from +1.8
to +3.6 V. A standard 4-pin SPI bus is used to communicate with an external microcontroller. Three configurable
general purpose I/Os are available. A complete list of the available GPIO functions is shown in
"8. Auxiliary Functions"and includes microcontroller clock output, Antenna Diversity, POR, and various interrupts.
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3 dB
steps. The RFM22B/23B
RFM22B/23B
supports
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