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MC145106DW Datasheet(PDF) 5 Page - Motorola, Inc |
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MC145106DW Datasheet(HTML) 5 Page - Motorola, Inc |
5 / 8 page MC145106 MOTOROLA 5 PLL SYNTHESIZER APPLICATIONS The MC145106 is well suited for applications in CB radios because of the channelized frequency requirements. A typi- cal 40 channel CB transceiver synthesizer, using a single crystal reference, is shown in Figure 3 for receiver IF values of 10.695 MHz and 455 kHz. In addition to applications in CB radios, the MC145106 can be used as a synthesizer for several other systems. Various frequency spectrums can be achieved through the use of proper offset, prescaling, and loop programming techniques. In general, 300 – 400 channels can be synthesized using a single loop, with many additional channels available when multiple loop approaches are employed. Figures 4 and 5 are examples of some possibilities. In the aircraft synthesizer of Figure 5, the VHF loop (top) will provide a 50 kHz, 360 channel system with 10.7 MHz R/T offset when only the 11.0500 MHz (transmit) and 12.1200 MHz (receive) frequencies are provided to mixer #1. When these signals are provided with crystal oscillators, the result is a three crystal 360 channel, 50 kHz step synthesizer. When using the offset loop (bottom) in Figure 5 to provide the indicated injection frequencies for mixer #1 (two for transmit and two for receive) 360 additional channels are possible. This results in a 720–channel, 25 kHz step synthesizer which requires only two crystals and provides R/T offset capability. The receive offset value is determined by the 11.31 MHz crystal frequency and is 10.7 MHz for the example. The VHF marine synthesizer in Figure 4 depicts a single loop approach for FM transceivers. The VCO operates on fre- quency during transmit and is offset downward during re- ceive. The offset corresponds to the receive IF (10.7 MHz) for channels having identical receive/transmit frequencies (sim- plex), and is (10.7 – 4.6 = 6.1) MHz for duplex channels. Car- rier modulation is introduced in the loop during transmit. Figure 3. Single Crystal CB Synthesizer Featuring On–Frequency VCO During Transmit 26.965 – 27.405 MHz (TRANSMIT) 26.510 – 26.950 MHz (RECEIVE) RECEIVER 1ST LOCAL OSC SIGNAL TO RECEIVER 2ND MIXER 25.6 MHz X 5 MIXER 16.270 – 16.710 MHz 10.24 MHz MIXER BUFFER GND VDD 5.0 kHz BUFFER VCO LOOP FILTER PHASE DETECTOR LD R/T SWITCH WAFERS MC145106 PROGRAMMABLE DIVIDER ÷ 29/210 ÷ 2 OSC 10.24 MHz 1.365 – 1.805 MHz (TRANSMIT) 0.91 – 1.35 MHz (RECEIVE) |
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