User's Manual

System Overview and Functional Block Descriptions
1322x-LPB Reference Manual, Rev. 1.1
3-4 Freescale Semiconductor
3.3 RF 2.4 GHz ISM Band radio design
The MC1322x transceiver includes a low noise amplifier, 1mW nominal output power, PA with internal
voltage controlled oscillator (VCO), integrated transmit/receive switch, on-board power supply regulation,
and full spread-spectrum encoding and decoding. The 1322x-LPB requires only a minimum amount of
external components and a chip-antenna for a complete solution. Figure 3-5 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
• Uses a minimum number of RF components
Figure 3-5. 1322x-LPB RF Network.
3.4 Power Sources
To allow maximum versatility, the 1322x-LPB can be powered via a DC source (nominally 5 VDC) or a
variety of battery sources.
• An “OFF/ON” slide switch (SW5) is provided that disconnects all supplies, no matter which is
active.
• A green “PWR” LED (D5) is provides as a Power-On indicator.
• All sources are isolated via diodes.
3.4.1 External DC Source
The DC source is typically an AC-DC converter
• The DC source can be from 4.4 to 12 VDC
• When connected, it automatically shuts down the battery supply.
• The DC source is regulated to 3.3 V; however, the raw battery pack voltage directly supplies the
circuitry
ANT1
F_Antenna
L1
3.9nH
Not Mounted
C3
1pF
Not Mounted
RF
C1
10pF
Not Mounted
RF_RX_TX
RF_GND