Beissbarth FAA2400 RF Transceiver Module User Manual
Beissbarth GmbH RF Transceiver Module
User Manual
FAA2400
Seite 1 von 15 16/04/00
2.4GHz WIRELESS DATA TRANSCEIVER MODULE
FAA2400 is a wireless transceiver module for half-duplex data transmission in the 2.4GHz ISM
band. FAA2400 operates with digital data rates of more than 500kbps over distances of about
200m (line of sight) or 30m (inside buildings).
FAA2400 allows the construction of 2.4GHz wireless links accordingly BAPT222 ZV125 in
Germany and I-ETS-300440 in Europe and the corresponding international regulations in
combination with a simple microcontroller.
Features
• Miniature module for PCB mount
• Size (without contact pins) 33 x 30.5 x 8 mm³
• Mounting and electrical connection with contact pins (2.54mm grid)
• BAPT222 ZV125 and I-ETS-300440 tested and approved, meets also other
international regulations for 2.4GHz ISM
• Worldwide registration for the 2.4GHz ISM band possible
• Maximum halfduplex data rate of 500kbps
• Modulation type 2FSK (2 Level Frequency Shift Keying)
• Frequency range 2.4 bis 2.4835 GHz (up to 2.5 GHz also possible),
PLL synthesizer
• Frequency steps and frequency channels free programmable
• Receive and transmit frequency programmable also while operating
• Transmission power –30 to +5dBm typical (50W) with simple DC control
• Typical input sensitivity of –96dBm (Baudrate 200kbit/s)
• Range of about 30m inside buildings and about 200m with line of sight (using
2.4GHz 0dBd antenna, full transmit output power)
• Current consumption of typical 55mA in transmit and 50mA in receive mode at
3.2 to 6.0V
• Standby mode for power saving
• Logic inputs and outputs 3V CMOS compatible
• Separate data input and output
Note: Please take care for sufficient ESD protection when using the FAA2400!
FCC ID: PWPFAA2400
FAA2400
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FAA2400 includes all necessary functions for wireless transmission of any digital baseband
signal over 2.4GHz with 2FSK modulation, and for receiving a corresponding 2.4GHz signal and
change it back to a digital baseband signal. Main parameters like frequency, transmission power
and several operating modes can be controlled via digital and analog control lines.
FAA2400 is a dual superhet receiver in receive mode. This allows a very good input sensitivity
and selectivity. The 2FSK modulated RF signal between 2.400 and 2.4835GHz comes from the
antenna pin over the RF filter and the Rx/Tx switch to the low noise amplifier (LNA).
The amplified and filtered signal is mixed by the first mixer with the RF local oscillator (LO)
frequency (RF VCO and PLL frequency synthesizer work as LO). The resulting first intermediate
frequency (IF) is 323.0MHz. The RF LO frequency f LO1 for a given receive frequency f RF is
determined by f LO1 = f RF − 323.0MHz (see section ”Programming the PLL Frequency
Synthesizer”). The IF signal is filtered, amplified and mixed with a second local oscillator signal to
the second IF of 5.7MHz.
Frequency of second LO has to be f LO2 = 323.0MHz-5.7MHz= 317.3MHz. Second IF is amplified,
filtered and limited to get a constant amplitude for demodulation.
FSK demodulator and comparator deliver the demodulated baseband signal on pin DATA OUT.
The RSSI output is an analog voltage as measure of the RF input power on the selected
frequency.
In transmit mode the frequency of the first IF is 2FSK modulated with the data signal from DATA
IN. The modulated IF signal is amplitude regulated and mixed to the desired transmit frequency
between 2.400 and 2.4835GHz. This is done by the transmit mixer and the second LO. Power
amplifier (PA) delivers the necessary output power.
The RF reaches pin ANTENNA over the Tx/Rx switch and a 2.4GHz bandpass. An analog DC
voltage on TX POWER controls the output power from –30 to +5dBm typical.
The frequency of IF LO is the same like receiving.
RF LO programming is f LO1 = f RF − 317.3MHz (see section f LO1 = f RF − 317.3MHz „Programming
the PLL Frequency Synthesizer”).
STANDBY disables all functions and reduces the current consumption to a minimum. With
changing from transmit to receive mode and back, after putting on DC supply and after
STANDBY the PLL frequency synthesizer must be programmed (see section „Programming the
PLL Frequency Synthesizer”). Programming is done like described above dependent on
operating mode.
FCC ID: PWPFAA2400