User's Manual

System Overview and Functional Descriptions
1322x-USB Reference Manual, Rev. 1.1
3-4 Freescale Semiconductor
3.4 Low-cost 2.4 GHz ISM Band radio
The MC1322x provides an onboard balun, antenna switch, and LNA. The only external component
required for the radio is an antenna. The USB dongle uses a PCB-mounted chip antenna. Figure 3-6 shows
the RF network external to the MC1322x.
• Typical nominal output power is 0 dBm, with +4 dBm max
• Typical sensitivity is -95 dBm.
• Frequency range is 2405 to 2480 MHz
• Typical range (outdoors, line of sight) is 300 meters
Figure 3-6. 1322x USB Dongle/Zniffer RF Network
3.5 USB Interface
Primary connection to the wireless node is the USB port that is provided via a USB “B” receptacle
designated as J2. Figure 3-7 shows the connector pinout.
Figure 3-7. USB Connector Pinout
The port is connected to a FTDI FT232R USB <> UART device that appears as a Virtual COM port (VCP)
to the PC. PC drivers are available with the module. The USB interface is configured as a “Bus Powered”
device and draws all required power from the USB interface. The device is USB 2.0, full speed compatible.
RF_RX_TX
CHIP ANTENNA
L3
3.9nH
Not Mounted
NC
2
RF
1
ANT2
2450AT43A100
C4
1pF
Not Mounted
C5
10pF
Not Mounted
RF_GND